研究者詳細 - 後藤　佐知子

論文 - 後藤　佐知子

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Investigating the Effects of Reconstruction Conditions on Image Quality and Radiomic Analysis in Photon-counting Computed Tomography. 査読国際誌

Miyu Ohata, Ryohei Fukui, Yusuke Morimitsu, Daichi Kobayashi, Takatsugu Yamauchi, Noriaki Akagi, Mitsugi Honda, Aiko Hayashi, Koshi Hasegawa, Katsuhiro Kida, Sachiko Goto, Takao Hiraki

Journal of medical physics 50 ( 1 ) 100 - 107 2025年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

INTRODUCTION: Photon-counting computed tomography (CT) is equipped with an adaptive iterative reconstruction method called quantum iterative reconstruction (QIR), which allows the intensity to be changed during image reconstruction. It is known that the reconstruction conditions of CT images affect the analysis results when performing radiomic analysis. The aim of this study is to investigate the effect of QIR intensity on image quality and radiomic analysis of renal cell carcinoma (RCC). MATERIALS AND METHODS: The QIR intensities were selected as off, 2 and 4. The image quality evaluation items considered were task-based transfer function (TTF), noise power spectrum (NPS), and low-contrast object specific contrast-to-noise ratio (CNRLO). The influence on radiomic analysis was assessed using the discrimination accuracy of clear cell RCC. RESULTS: For image quality evaluation, TTF and NPS values were lower and CNRLO values were higher with increasing QIR intensity; for radiomic analysis, sensitivity, specificity, and accuracy were higher with increasing QIR intensity. Principal component analysis and receiver operating characteristics analysis also showed higher values with increasing QIR intensity. CONCLUSION: It was confirmed that the intensity of the QIR intensity affects both the image quality and the radiomic analysis.

DOI： 10.4103/jmp.jmp_114_24

Accuracy of deep learning-based attenuation correction in 99mTc-GSA SPECT/CT hepatic imaging 査読

M. Miyai, R. Fukui, M. Nakashima, D. Hasegawa, S. Goto

Radiography 31 ( 1 ) 112 - 117 2025年1月

Backside Irradiation of Ultraviolet-A for Correcting Nonuniformity Error of Gafchromic XR-QA2 Films 査読

Nobuyoshi Tanki, Sachiko Goto, Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Tadao Kuwano

Journal of Medical Physics 49 ( 4 ) 563 - 567 2024年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Ovid Technologies (Wolters Kluwer Health)

Purpose:

Radiochromic film is used for quality assurance and quality control of X-ray equipment in the diagnostic radiology. In addition, three-dimensional dose distribution of computed tomography (CT) is measured. To correct the nonuniformity and uncertainty of radiochromic films for dose measurement of CT, the films are preirradiated ultraviolet (UV)-A rays. There is a difference in the UV protection strength of radiochromic films. A concern exists about the effects of the UV-A irradiation intensity. We thus irradiated with UV-A rays from the backsides of the films to assess if backside irradiation was possible.

Materials and Methods:

Gafchromic XR-QA2 and RTQA2 were used in this study. The UV-A rays were simultaneously irradiated on the front and backsides of each film for 12 h. The yellow layer of each film was scanned and imaged. The average pixel values ± standard deviations (SDs) were compared. In the statistical analysis, a paired t-test was performed. To compare, the active-layer densities engendered by the UV-A rays. Calibration curve was created with 48 h of preirradiation of UV-A.

Results:

The mean pixel values ± SD for Gafchromic XR-QA2 on the front and backsides were 130.776 ± 0.812 and 81.015 ± 1.128, respectively. On the other hand, the mean pixel values ± SD for Gafchromic RTQA2 on the front and backsides were 62.299 ± 1.077 and 133.761 ± 1.365, respectively. The statistical results of the paired t-test were significantly different (P < 0.01) between both films. Fitting equation of the calibration curve is shown below. y = -390.47 ± 200 + (443.45 ± 10x80).5068 ± 0.0434.

Conclusion:

Based on the relationship between the sensitivity of the active layer to UV-A rays and the strength of UV protection on the surface, we concluded that backside irradiation is recommended for Gafchromic XR-QA2, and frontside irradiation is recommended for Gafchromic RTQA2.

DOI： 10.4103/jmp.jmp_87_24

Effect of segmentation dimension on radiomics analysis for MGMT promoter methylation status in gliomas. 査読

Ryohei Fukui, Masataka Onishi, Koshi Hasegawa, Miyu Ohata, Katsuhiro Kida, Sachiko Goto

Aktualności Neurologiczne 24 ( 1 ) 8 - 14 2024年7月

Assessment of a New Elbow Joint Positioning Method Using Area Detector Computed Tomography 査読

Takuya AKAGAWA, Ryohei FUKUI, Katsuhiro KIDA, Ryutaro MATSUURA, Makoto SHIMADA, Mitsuhiro KINOSHITA, Yoko AKAGAWA, Sachiko GOTO

Acta Medica Okayama 78 ( 3 ) 215 - 225 2024年6月

Native myocardial T1 mapping using inversion recovery T1-weighted turbo field echo sequence. 査読

Katsuhiro Kida, Takamasa Kurosaki, Ryohei Fukui, Ryutaro Matsuura, Sachiko Goto

Radiological physics and technology 2024年3月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study proposes the use of the inversion recovery T1-weighted turbo field echo (IR-T1TFE) sequence for myocardial T1 mapping and compares the results obtained with those of the modified Look-Locker inversion recovery (MOLLI) method for accuracy, precision, and reproducibility. A phantom containing seven vials with different T1 values was imaged, thereby comparing the T1 measurements between the inversion recovery spin-echo (IR-SE) technique, MOLLI, and the IR-T1TFE. The accuracy, precision, and reproducibility of the T1-mapping sequences were analyzed in a phantom study. Fifteen healthy subjects were recruited for the in vivo comparison of native myocardial T1 mapping using MOLLI and IR-T1TFE sequences. After myocardium segmentation, the T1 value of the entire myocardium was calculated. In the phantom study, excellent accuracy was achieved using IR-T1TFE for all T1 ranges. MOLLI displayed lower accuracy than IR-T1TFE (p =0.016), substantially underestimating T1 at large T1 values (> 1000 ms). In the in vivo study, the first mean myocardial T1 values ± SD using MOLLI and IR-T1TFE were 1306 ± 70 ms and 1484 ± 28 ms, respectively, and the second were 1297 ± 68 ms and 1474 ± 43 ms, respectively. The native myocardial T1 obtained with MOLLI was lower than that of IR-T1TFE (p < 0.001). The reproducibility of native myocardial T1 mapping within the same sequence was not statistically significant (p = 0.11). This study demonstrates the utility and validity of myocardial T1 mapping using IR-T1TFE, which is a common sequence. This method was found to have high accuracy and reproducibility.

DOI： 10.1007/s12194-024-00795-w

Deep learning-based attenuation correction method in 99mTc-GSA SPECT/CT hepatic imaging: a phantom study 査読

Masahiro Miyai, Ryohei Fukui, Masahiro Nakashima, Sachiko Goto

Radiological Physics and Technology 2023年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

DOI： 10.1007/s12194-023-00762-x

その他リンク： https://link.springer.com/article/10.1007/s12194-023-00762-x/fulltext.html

Proposal for diagnosis using FLAIR image aimed for pediatric MELAS with recurrent stroke-like episodes on MRI system cannot take ASL imaging 査読

Makoto Shimada, Tae Ikeda, Ryohei Fukui, Katsuhiro Kida, Ryutaro Matsuura, Takuya Akagawa, Sachiko Goto

Egyptian Pediatric Association Gazette 71 ( 1 ) 2023年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

Abstract

Background

Arterial spin-labeling (ASL) imaging is currently the most useful method for diagnosing mitochondrial encephalomyopathy, lactic acidosis, and stroke-like attack syndrome (MELAS). However, ASL is often an optional feature of standard MRI systems. Therefore, not all MRI systems can perform ASL imaging. In contrast, fluid-attenuated inversion recovery (FLAIR) imaging is one of the common sequences in brain MRI because FLAIR imaging can be performed regardless of the specifications of the equipment. This study aimed to compare the diagnostic performance of quantitative analysis of signal intensity obtained from fluid-attenuated inversion recovery (FLAIR) images with ASL images for MELAS with recurrent stroke-like episodes (SLEs). A total of 68 cases with normal magnetic resonance imaging findings and 25 cases diagnosed MELAS with recurrent SLEs were included. We evaluated the frontal lobe and cuneus as target areas and compared the regional cerebral blood flow (rCBF) values obtained from ASL images with the normalized signal intensity (nSI) obtained from FLAIR images.

Results

The sensitivity and specificity for diagnosing MELAS from linear discriminant analysis (LDA) obtained from the rCBF values were 0.84 and 0.941, respectively, and those of nSI were 0.8 and 0.897, respectively. The area under the ROC curves (AUC) calculated from the receiver operating characteristic (ROC) curve analysis using rCBF values and nSI were 0.889 and 0.804, respectively.

Conclusion

Quantitative analysis using the signal intensity of the FLAIR image could have a diagnostic performance equivalent to that of rCBF values obtained from ASL images.

DOI： 10.1186/s43054-023-00232-4

その他リンク： https://link.springer.com/article/10.1186/s43054-023-00232-4/fulltext.html

3D phase-sensitive inversion recovery sequence for intracranial vertebrobasilar artery dissection. 査読国際誌

Takuya Enoki, Katsuhiro Kida, Wataru Jomoto, Yusuke Kawanaka, Manabu Shirakawa, Masataka Miyama, Noriko Kotoura, Sachiko Goto

Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia 118 52 - 57 2023年10月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: T1-weighted 3D turbo spin echo (T1W-3D-TSE) sequences with variable refocusing flip angle are commonly used to diagnose intracranial vertebrobasilar artery dissection (iVAD). However, magnetic susceptibility artifacts of the cavernous sinus may cause loss of the basilar and vertebral arteries. This study investigated the effectiveness of a 3D phase-sensitive inversion recovery (3D-PSIR) sequence in reducing magnetic susceptibility artifacts in the cavernous sinus, and its imaging findings for iVAD. METHODS: Twelve volunteers and eleven patients with iVAD were included. Magnetic resonance imaging (MRI) was performed using a 3.0-T MRI system. 3D-PSIR and T1W-3D-TSE sequences were used. Vessel wall defects and contrast-to-noise ratio (CNR) were evaluated. The MRI findings were visually evaluated. RESULTS: In the 3D-PSIR images, one volunteer (8 %) had vessel wall defects, and five (42 %) had vessel wall defects (p = 0.046) in the T1W-3D-TSE images. CNR was higher in 3D-PSIR images for vessel wall-to-lumen, whereas it was higher in T1W-3D-TSE images for vessel wall-to-CSF (p < 0.001). Visual evaluation revealed similar MRI findings between the two sequences. CONCLUSIONS: The 3D-PSIR sequence may be able to improve the vessel wall defects and achieve MRI findings comparable to those of the T1W-3D-TSE sequence in iVAD. The 3D-PSIR sequence can be a useful tool for the imaging-based diagnosis of iVAD.

DOI： 10.1016/j.jocn.2023.10.008

Influence of Two-Dimensional and Three-Dimensional Acquisitions of Radiomic Features for Prediction Accuracy 査読

Ryohei Fukui, Ryutarou Matsuura, Katsuhiro Kida, Sachiko Goto

Progress in Medical Physics 34 ( 3 ) 23 - 32 2023年9月

Fundamental study for application of 3D phase-sensitive inversion recovery sequence to multiple sclerosis 査読

Takuya Enoki, Wataru Jomoto, Katsuhiro Kida, Sachiko Goto, Noriko Kotoura

Journal of the Japan Association of Radiologic Technologists 70 ( 6 ) 580 - 587 2023年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：(公社)日本診療放射線技師会

本研究の目的は,3D PSIRを多発性硬化症へ応用するために,撮像パラメーターと脳組織コントラストの関係を明らかにすることである.ファントム実験で,TFE factor,shot interval,TIがコントラストに与える影響を検討した.TFE factorは30,shot intervalは1000msが採用された.健常ボランティアでTI(300-800ms)を変化させ,脳組織コントラストについて視覚評価を行った。TIを長くするとコントラストは向上した.3D-PSIRを多発性硬化症へ応用するには,TFE factorが30,shot intervalが1000msの場合,TIは700msが最適である.(著者抄録)

Image Quality Assessment of Deep Learning Image Reconstruction in Torso Computed Tomography Using Tube Current Modulation 査読

Kazuhiro Takeuchi, Yasuhiro Ide, Yuichiro Mori, Yusuke Uehara, Hiroshi Sukeishi, Sachiko Goto

Acta Medica Okayama 77 ( 1 ) 45 - 55 2023年2月

Effect of Bead Device Diameter on Z-Resolution Measurement in Tomosynthesis Images: A Simulation Study 査読

Ryohei Fukui, Miho Numata, Saki Nishioka, Ryutarou Matsuura, Katsuhiro Kida, Sachiko Goto

Progress in Medical Physics 33 ( 4 ) 1 - 9 2022年12月

Effect of Median Filter Processing on Measurement of Presampled Modulation Transfer Function using Edge Method in Digital Radiographic Systems 査読

Kazuhiro Takeuchi, Masaki Asahara, Masatoshi Morimoto, Sachiko Goto

医用画像情報学会雑誌 39 ( 2 ) 30 - 37 2022年6月

システム平面感度法における収集条件が定量値に与える影響査読

田中杏佳, 中嶋真大, 後藤佐知子, 竹田芳弘

核医学技術 42 ( 2 ) 139 - 145 2022年2月

Effect of the Number of Projected Images on the Noise Characteristics in Tomosynthesis Imaging 査読

Ryohei Fukui, Ryutaro Matsuura, Katsuhiro Kida, Sachiko Goto

Progress in Medical Physics 32 ( 2 ) 50 - 58 2021年6月

Image Evaluation of Free-breathing Navigator Echo and Triggered Cardiac-gated Delayed 査読

Ryutaro Matsuura, Sachiko Goto, Shuhei Sato, Noriaki Akagi, Seiji Tahara

Acta Med Okayama 72 ( 3 ) 267 - 273 2018年6月

High spatial resolution MRA of renal arteries using contrast behavior between fat and water during transient phase before reaching a steady state 査読

Katsuhiro Kida, Sachiko Goto, Yoshiharu Azuma

EUROPEAN JOURNAL OF RADIOLOGY 81 ( 5 ) 846 - 850 2012年5月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER IRELAND LTD

Purpose: Our aim is high spatial resolution imaging of maximum intensity projection (MIP) images in renal magnetic resonance angiography (MRA) by constructing a protocol for acquiring three-dimensional volume data with isotropic voxels.
Materials and methods: We eliminated water-selective excitation (WATS) and utilized effective contrast behavior between fat and water before reaching a steady state-that is, during the transient phase-to cover fat suppression by WATS. In a phantom study, the optimal flip angle was investigated under the "low-high Y" profile order using distilled water and baby oil to construct a protocol with isotropic voxels. Signal intensity, contrast, noise and signal-to-noise ratio were investigated to compare image qualities between the conventional and the constructed isotropic protocols. In a clinical study, three radiologists and two radiological technologists visually evaluated clinical images of 20 volunteers for spatial resolution, contrast and overall reader confidence in two protocols.
Results: We constructed an isotropic protocol with voxel dimensions of 0.78 mm x 0.78 mm x 0.78 mm at a flip angle of 90 degrees. We maintained the scan time but enlarged the x-y pixel dimensions from 0.59 mm x 0.59 mm to 0.78 mm x 0.78 mm and shortened image height from 48 mm to 42.9 mm. Data from the phantom study were worse in the isotropic protocol than in the conventional protocol. However, overall reader confidence in the clinical images was significantly better in the isotropic protocol than in the conventional protocol (p < .001).
Conclusion: Our study indicated the value of addressing high spatial resolution imaging of MIP images for renal MRA by constructing an isotropic protocol. (C) 2011 Elsevier Ireland Ltd. All rights reserved.

DOI： 10.1016/j.ejrad.2011.02.031

頭部MRIのT1強調画像における各種Contrast to Noise Ratio (CNR) 算出法の比較査読

木田勝博, 後藤佐知子, 東義晴, 梶谷努

日本放射線技師会雑誌 59 ( 702 ) 81 - 86 2012年

Computed Radiography（CR）マンモグラフィにおける乳腺含有率の推定査読

辻田直子, 後藤佐知子, 東義晴, 白石順

日本放射線技術学会雑誌 67 ( 12 ) 1540 - 1547 2011年

記述言語：日本語出版者・発行元：Japanese Society of Radiological Technology

Measurement of a percent glandular tissue composition (%GTC) is important in terms of the estimation of individual patient exposure dose and the prediction of malignancy, and thus a number of reports for estimating %GTC by use of a mammogram have been published. In this study, we propose a method for estimating individual %GTC by use of computed radiography (CR) mammograms. By employing breast-equivalent phantoms that are able to create breast phantom images with various combinations of fat and glandular tissue, as well as the thickness of whole breast, we determined a reference table for converting an each pixel value on CR mammography to the glandular tissue ratio. Therefore, the %GTC for individual breast was estimated by averaging glandular tissue ratio for a whole region. The clinical image data set that consisted of 49 CR mammograms were used for estimating %GTC. A paired comparison method for determining subjective ranking of the degree of breast density was employed in order to demonstrate the validity of our method. The results indicate that the average estimated %GTC was 35.0% (ranged from 12.0% to 67.0%) and they had a increased correlation with the ranking of those obtained by observer test. Therefore, it was suggested that our proposed method would be utilized for estimating the %GTC in objective manner.

DOI： 10.6009/jjrt.67.1540

その他リンク： https://jlc.jst.go.jp/DN/JALC/00384818611?from=CiNii

頚部MRI脂肪抑制T1強調画像における磁化率アーチファクト軽減補助具（Sat-Pad）の作製査読

木田勝博, 後藤佐知子, 梶谷努, 東義晴

岡山赤十字病院医学雑誌 22 ( 1 ) 27 - 30 2011年

記述言語：日本語出版者・発行元：岡山赤十字病院医学雑誌編集委員会

MRIにおいて軟部組織と空気境界面は、磁化率変化によるアーチファクトが起こりやすい。通常、MRIでは脂肪抑制法が頻繁に用いられるが、磁化率の変化は脂肪抑制のムラを引き起こす。その脂肪抑制ムラは、解剖学的な形状のために、頸部で頻繁に生じる。本研究では、磁化率変化を軽減する補助具(Sat-Pad)の作製を試みた。(著者抄録)

高エネルギーX線に対するRadiochromic filmの濃度測定精度の検討査読

青山英樹, 東義晴, 後藤佐知子, 田原誠司, 宇野弘文, 稲村圭司, 門久繁文, 中桐義忠, 金澤右, 住本哲宏, 東眞美

日本放射線技術学会雑誌 60 ( 11 ) 1533 - 1542 2004年

記述言語：日本語出版者・発行元：公益社団法人日本放射線技術学会

Radiochromic film (RC-film) is of great interest as a film-type dosimeter for radiation oncology applications. We present a two-dimensional image-based evaluation of the measurement accuracy of a commercial RC-film product (Gafchromic MD-55-2 film, ISP TECHNOLOGIES, Inc.) by using a commercial Laser Densitometer (Model 1710, Computerized Medical Systems, Inc.) as an optical density imaging system. The coefficient of variation of the density (pixel-value) in one sample was approximately 3% to 11 % at 3 Gy or less, and 3% or less at 4 to 60 Gy. Although the coefficient of variation between three samples at the same dose was about 14% at 1 Gy, it decreased as the dose increased, reaching several percent. In 1 to 6 Gy samples, geometric imaging artifacts [interference (moire) patterns] were observed, and it was found that scan-sampling pitch influenced the accuracy of measurement of the density of the sample. To improve the accuracy of density measurement, sufficient knowledge about characteristic features of the density measuring system is essential.

DOI： 10.6009/jjrt.KJ00003326577

放射線治療時の治療部外散乱被曝線量に関する研究査読

川辺睦, 中桐義忠, 小橋一輝, 安村直樹, 山下剛央, 後藤佐知子, 丸山敏則, 杉田勝彦

岡山大学医学部保健学科紀要 2003年

線量測定用 GAFCHROMIC XR TYPE T の特性査読

窪津真理子, 中桐義忠, 氏福亜矢子, 谷口友季子, 八谷美穂, 東義晴, 後藤佐知子, 丸山敏則, 青山英樹, 田原誠司, 稲村圭司, 渡邊敏充, 杉田勝彦

岡山大学医学部保健学科紀要 2003年

Estimating AverageGlandular Dose by Measuring Glandular Rate in Mammograms 査読

Sachiko Goto, Yoshiharu Azuma, Tetsuhiro Sumimoto, Shigeru Eiho

MEDICAL IMAGING TECHNOLOGY 21 ( 5 ) 369 - 376 2003年

Estimation of the digitized mammographic breast density by the histogram approach using the neural network

Sachiko Goto, Yoshiharu Azuma, Tetsuhiro Sumimoto, Yoshihiro Takeda, Shigeru Eiho

Proceedings of the 8th International Workshop on ADC Modelling and Testing, IWADC 2003 2003年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Universita degli Studi di Perugia

Our aim was to improve the accuracy of classifying x-ray mammographic breast densities. The histogram approach using the neural network was used for the purpose of constructing a flexible system. In this study the phantom of the synthetic breast-equivalent resin material for the process of the A/D conversion of mammograms was employed. The digital values can offset the difference in characteristics between the mammography system, the unit, etc. Furthermore the features of our system use the neural network, and then tune the neural network by the histogram of the digital values and by the radiologists' and expert mammographers' assessment ability. Although there was an observer's bias, our system was able to classify the breast density automatically according to that observer. This is only possible if the observer has been trained to some extent and is capable of maintaining an objective assessment according to the assessment criteria.

発泡剤とバリウムの投与順序の相違による飲みやすさと流出程度査読

澁谷光一, 三宅浩, 大枝嗣人, 藤照正, 中桐義忠, 東義晴, 丸山敏則, 後藤佐知子, 杉田勝彦, 平木祥夫

日本放射線技術学会雑誌 57 ( 4 ) 440 - 443 2001年

記述言語：日本語出版者・発行元：公益社団法人日本放射線技術学会

Rates of Flow of barium meal into the bowel and ease of swallowing a barium meal and foaming agent were investigated according to the procedure of administration, in order to study the timing of adding the foaming agent. In group medical examinations, the flow rates of barium meals of 100 examinees given a barium meal followed by a foaming agent were compared with those of the same examinees given the foaming agent first. Parasympatholytic agents were not administered in this study. When the foaming agent was given before the barium meal, the flow rate of the barium meal into the bowels was 44.0%. In contrast, when the foaming agent was given after the barium meal, the rate was 78.0%. A total of 67.3% of 101 Volunteers given the foaming agent and the barium meal twice in the reverse order answered that it was easier to swallow the barium meal first. When a parasympatholytic agent is not given, it is better to give the foaming agent first, even though it is more difficult to swallow the barium meal after the foaming agent, because it is most important in examination of the stomach that the barium meal does not flow out into the bowel.

DOI： 10.6009/jjrt.KJ00001357562

股関節X線撮影時の女性生殖腺防護についての検討査読

中桐義忠, 丸山敏則, 後藤佐知子, 東義晴, 澁谷光一, 田村恵里, 谷本江利子, 鳥居史子, 竹田芳弘, 杉田勝彦

岡山大学医学部保健学科紀要 11 ( 2 ) 59 - 64 2001年

記述言語：日本語出版者・発行元：岡山大学医学部保健学科

幼小児を含めた若年者の股関節X線撮影検査においては鉛板などで生殖腺を防護して行うのが通常である。男性の場合は生殖腺は体外に露出しているので，それを鉛板で包むようにすればある程度目的は達成される。しかし，女性の場合，生殖腺は骨盤腔内に存在するため，卵巣及び子宮を防護でき診断目的領域にかからないように鉛板を成形し，腹壁上に置いて撮影する。X斬写真上ではグリッドで散乱線を除去しているため，鉛板の陰影がくっきりと撮影され，生殖腺は完全に防護されているように見える。しかし，体内では散乱線によるかなりの被曝があるものと考えられる。そこで今回，鉛板下の散乱線量を鉛板幅及び電圧を変化させ，ファントム内各深さの散乱線量を測定した。その結果，鉛板下の散乱線量が相当量認められ，その量は深さ3～4cmでピークを形成した。鉛板幅による変化は幅が狭いほど線量は大きくなり，電圧による変化は60kVと80kVを比べると80kVの方が多くなった。これを鉛板なしの場合と比較すると，ファントム内意さが増すにしたがい増大した。したがって，臨床において鉛板がずれて再撮影をすることのないよう細心の注意が必要であると考えられた。Usually in a hip-joint radiographic examination for the youth including children, the gonads should be well protected with an appropriate lead shield etc. Since themale gonads are in the outside of the body, if covered with a lead shield, the shield can protect them. However, in the case of the female, since the gonads of exist in a pelvic cavity, the lead shield is cut to a specific pattern so that it can protect the ovaries and the womb,and it is set on the abdomen during the radiographic exposure. Since the scattered radiation on an X-ray film can be removed with the grid, the image of a lead shield is obtained clearly, and the gonads seem to be protected completely. The shield can not protect the gonads of the female from the scattered radiation, though it protects them almost completely from the primary X-rays beam. Therefore, the gonads have radioactive contamination from scattered radiation. Then, in order to estimate the amount of scattered radiation under the lead shield, the dose under the shield was measured by using a phantom in this research, changing lead shield width, the tube-voltage, and the monitoring depth of a phantom. As a results, the dose under the lead shield was observed considerably and showed the peak at the depth of 3 or 4cm. Therefore, it was thought that a careful caution was required for obviating lead shield in clinical.

その他リンク： http://search.jamas.or.jp/link/ui/2001185919

股関節X線撮影における女性生殖腺の防護について査読

中桐義忠, 丸山敏則, 後藤佐知子, 谷本江利子, 田村恵里, 鳥居史子, 渋谷光, 東義晴

岡山県放射線技師会会誌 2001年

片面増感紙/片面乳剤フィルムシステムの特性－空気減弱によるX線エネルギーの影響－査読

丸山敏則, 後藤佐知子, 東義晴, 中桐義忠, 住本哲宏, 山本秀樹

電子情報通信学会技術研究報告 101 ( 434 ) 1 - 8 2001年

担当区分：責任著者記述言語：日本語出版者・発行元：一般社団法人電子情報通信学会

低エネルギー領域のマンモグラフィに使用される片面増感紙/片面乳剤フィルムシステムの特性曲線作成に対しては空気減弱が問題となる.そこで, 異なるX線エネルギー励起におけるマンモグラフィ用増感紙の蛍光スペクトルを測定し, 増感紙の蛍光発生に対するエネルギーによる影響を検討した.またマンモグラフィ専用装置の低エネルギーX線を用いて, 距離によって連続的に変化するエネルギー分布に対応した空気減弱のより正しい補正を試みた.さらに一般撮影領域のX線エネルギーを用いて作成した特性曲線とマンモグラフィ専用装置の低エネルギーX線を用いて空気減弱分を補正して得られた特性曲線を比較した.その結果, 空気減弱分が無視できるX線エネルギーを選択すれば, 特性曲線を作成できる可能性が得られた.

Breast Dosimetry System in Screen/Film Mammography 査読

Sachiko GOTO, Yoshiharu AZUMA, Toshinori MARUYAMA, Yoshitada NAKAGIRI, Yoshihiro TAKEDA, Katsuhiko SUGITA, Shigefumi KADOHISA

Bull Fac Health Sci, Okayama Univ Med Sch 10 ( 2 ) 99 - 106 2000年

担当区分：筆頭著者記述言語：英語出版者・発行元：岡山大学医学部保健学科

The average glandular dose to glandular tissue m mammography is generally assumed to be a function of beam quality (HVL), x-ray tube target material, tube voltage, breast thickness, breast composition and, to a lesser extent, x-ray tube voltage waveform. The average glandular dose is generally determined from published tables with knowledge of the above function. Tables for a high frequency x-ray generator are not yet published. In our study, the lookup tables for the average glandular dose were made at 28 kV (high frequency x-ray generator), employing a breast simulating tissue (0-100% adipose tissue, 0-100% glandular tissue) phantom for an Mo target - Mo filter source assembly. We tried to estimate breast composition from x-ray mammograms by digital image processing techniques, also using the simulating tissue phantom. Then the system that automatically calculates the average glandular dose from digitized clinical x-ray mammograms was built. It is considered that this system can contribute to objective evaluation of the averageglandular dose.乳房X線撮影法において乳腺組織に対する平均放射線吸収線量，すなわち平均乳腺線量は放射線のリスクの最も有用な測定法であり，現在，乳房に対する線量の評価に用いられている指標である。一般に，平均乳腺線量は線質（HVL），X線管球ターゲット材料，管電圧，圧迫乳房厚さ，乳房構成および（ある程度）X線管電圧波形の関数であるとされている。平均乳腺線量は，上記の関数についての情報を備えた表が公表されており，一般にその表を使って決定されている。近年，インバータ式といわれる高周波X線発生装置が普及してきた。しかし，その装置用の表は，まだ公表されていない。我々の研究では，乳房組織をシュミレートするファントム（0～100％乳腺組織，0～100％脂肪組織）を使用して，28kVでMoターゲット―Moフィルタソースアセンブリーを備えた高周波X線発生装置のために，平均乳腺線量用のルックアップテーブルを作成した。同様に，乳房組織をシュミレートするファントムを使用して，乳房X線写真から，ディジタル・イメージプロセシング技術によって，乳房構成の評価を試みた。そして，ディジタイズされた臨床乳房X線写真から，平均乳腺線量を自動的に計算するシステムを構築した。サンプル数が少ないため断定はできないが，日本女性は，基準構成（50％の脂肪および50％の乳腺組織）と比較すると，脂肪が少ない傾向を分析結果は示唆していた。また，平均乳腺吸収線量の限度は，明確に規定されていないが，American College of Radiology（ACR）は4 mGyなどを推奨している。また日本では，3 mGyが推奨されているが，我々の撮影システムはこれらを十分満足していた。このように本システムは，平均乳腺線量の客観的な評価に寄与するとともに，DR（digital radiography）などに応用すると，すなわちルックアップテーブルをDRのコンピュータに保存しておけば，撮影後すぐに乳房構成および平均乳腺線量を算出できる可能性をもつ。

発泡剤と硫酸バリウム造影剤の投与順序の検討査読

澁谷光一, 大枝嗣人, 三宅浩ー, 丹谷延義, 中桐義忠, 東義晴, 丸山敏則, 後藤佐知子, 杉田勝彦, 平木祥夫

日本放射線技術学会誌 56 ( 4 ) 605 - 609 2000年

記述言語：英語出版者・発行元：公益社団法人日本放射線技術学会

Two kinds of gastric images of 85 examinees were compared in order to study the procedure of giving barium meal and forming agents The more recent images were obtained with examinees given a barium meal followed by a forming agent, whereas the other images were of the same examinees obtained the previous year, with the foaming agent given before the barium meal. Results showed that when the barium meal was given first, the mucous membrane of the stomach was imaged better. In contrast, when the forming agent was given first, sodium tartrate, derived from the foaming agent, was considered to cover the mucous membrane and physically to prevent the barium meal from clinging to the membrane.

DOI： 10.6009/jjrt.KJ00001356895

マンモグラフィにおけるextended-cycle processの応用－描出能向上への効果－査読

丸山敏則, 後藤佐知子, 東義晴, 中桐義忠, 杉田勝彦

日本放射線技術学会誌 56 ( 11 ) 1339 - 1347 2000年

担当区分：責任著者記述言語：日本語出版者・発行元：公益社団法人日本放射線技術学会

We applied an extended-cycle process, in which the processing time is longer than the manufacturer's recommendation, to a low-speed, high-resolution system in mammography and investigated to what extent sharpness, contrast, and speed would be maintained or increased and whether this process could be applied clinically. In this study, a single-screen/single-emulsion film, Konica M-100/CM-H, was used in the lowspeed, high-resolution system, and M-200/CM-H was employed for comparison. Developing temperatures of 30, 32, and 34 degrees centigrade and a processing time of 210 seconds were selected as conditions of the extended-cycle process. M-100/CM-H with the extended-cycle process(M-100/E system)and M-200/CM-H with the standard-cycle process were compared at 34 and 90 seconds(M-200 system)in terms of contrast, speed, modulation transfer function(MTF), and Wiener spectrum(WS). In addition, the visibility of mammograms obtained using an RMI 165 phantom was evaluated by the method of paired comparisons. In the comparison of the M-200 system with the M-100/E system at 34 and 210 seconds, the speed was almost equal and the average gradient and MTF value at 2.5 cycles/mm increased about 20% and 8%, respectively. Ws was higher due to the increase in quantum mottle with increases in the average gradient and MTF. In the scale of the method of paired comparisons, M-100/E systems showed better results. Moreover, entrance skin exposure in air of the M-100/E system at 34 and 210 seconds was almost equal to that of the M-200 system. These results suggested that it was possible to improve visibility by the extended-cycle process in a low-speed, high-resolution system.

DOI： 10.6009/jjrt.KJ00001357361

マンモグラフィ用フィルムにおけるExtended-cycle Processの基礎的研究-粒状度- 査読

東義晴, 後藤佐知子, 丸山敏則, 中桐義忠, 杉田勝彦

日本放射線技術学会雑誌 56 ( 7 ) 937 - 945 2000年

担当区分：責任著者記述言語：日本語出版者・発行元：公益社団法人日本放射線技術学会

With single-emulsion films like those used in screen/film mammography, if the developing temperature is higher and/or the processing time is longer than recommended (i.e., extended-cycle process), film speed and/or film contrast are effectively increased. However, it can also be expected that radiographic noise will be increased by the extended-cycle process. Therefore, film graininess and radiographic mottle were investigated with standard-and extended-cycle processes in four single-screen/single-emulsion film systems for mammography, the Konica M-150/New CM, Fuji UM MAMMO Fine/UM-MA HC, Kodak Min-R2000/Min-R2000, and Kodak Min-R Medium/Min-R M. Investigation was carried out by measurement of the Wiener spectrum (WS). Results showed that the WS of film graininess increased in all films. The increase was greatest in Min-R M, and the rate of increase at 2.0 cycles/mm was 1.67 or more. The film showing the smallest increase was UM-MA HC, for which the rate of increase was 1.03-1.21. There were cases in which the spatial frequency at a 50 percent contribution rate of film graininess to radiographic mottle changed to a low spatial frequency. When only the increase in WS of radiographic mottle was examined, the increase was greatest in Min-R Medium/Min-R M, and the rate of increase at 2.0 cycles/mm was 1.65 or more. Min-R2000/Min-R2000 showed the least increase, and the rate of increase was 1.12-1.24. Increases in WS values were larger at 0.1-0.5 cycle/mm than at 2.0 cycles/mm when investigating the influence of trend using film graininess, and roller marks and so on could not be specified as a cause.

DOI： 10.6009/jjrt.KJ00001357002

マンモグラフィ用増感紙/フィルムシステムの特性曲線における空気減弱の影響査読

丸山敏則, 後藤佐知子, 東義晴, 中桐義忠, 渋谷光ー, 杉田勝彦

岡山大学医学部保健学科紀要 10 ( 2 ) 91 - 98 2000年

記述言語：日本語出版者・発行元：岡山大学医学部保健学科

マンモグラフィ専用装置を使用して，距離法で低エネルギー領域のX線におけるマンモグラフィ用増感紙／フィルムシステムの特性曲線を得るためには，空気滅弱の影響を考慮する必要がある。その影響について，実効エネルギーから空気減弱分を補正，照射線量測定による補正，Bednarek法を応用した新距離法の3種類の方法を使って検討した。さらに，一般撮影装置でも，マンモ用システムに対して距離法で特性曲線を作成し，エネルギーの変化による影響についても検討した。その結果，3方法の特性曲線およびグラディエント曲線は，新距離法が高濃度域でわずかにずれるもののほぼ一致した。新距離法に対する平均階調度，最大階調度の最大誤差は，2.7％，0.2％であり，一般撮影用装置の距離法と3方法との間では，一般撮影用装置の距離法に対して最大誤差は2.7％，1.5％であった。以上のことから，エネルギーの変化による特性曲線への影響はほとんどなく，低エネルギー領域での特性曲線は空気特配の補正を行うことのみで得られると考えられる。It is necessary to take air attenuation into account when we use inverse square sensitometry to obtain characteristic curve for the mammographic screen-film system at low x-ray energies as used with the dedicated unit. Three kinds of the inverse square sensitometry approach of correcting by air attenuation obtained from effective energy, of correcting by exposure dosimetry and of using modified the technique of Bednarek were employed to investigated the influence of x-ray energy in the characteristic curves for the mammographic screen-film system. In addition, the inverse square sensitometry with the general radiographic unit was employed and the influence of x-ray high energy in the characteristiccurves was also investigated for the same screeri-film system. Though characteristic curves and gradient curves of the new inverse square sensitometry were a little lower than the others in high-density region, the curves with three kinds of methods almost coincided. Maximum relative errors of average gradient and maximum gradient for modified the technique of Bednarek were found to be 2.7% and 0.2% among the others respectively. Moreover, maximum relative errors of gradient and maximum gradient for the inverse square sensitometry with the general radiographic unit were 2.7% and 1.5% among three kinds of methods with the dedicated unit respectively. It was considered that the characteristic curves for the mammographic screen-film system were little influenced by x-ray energy and could be obtained only by correcting air attenuation from above results.

その他リンク： http://search.jamas.or.jp/link/ui/2000278800

撮影条件からの腹部Ｘ線被曝線量の算定－岡山県下の現況－査読

中桐義忠, 丸山敏則, 後藤佐知子, 東義晴, 渋谷光一, 井上龍也, 門久繁文, 森岡泰樹

岡山県放射線技師会会誌 1999年

Improvement of image quality on mammographic screen-film system by extended-cycle process 査読

Sachiko GOTO, Toshinori MARUYAMA, Yoshiharu AZUMA, Yoshitada NAKAGIRI, Yoshihiro TAKEDA, Katsuhiko SUGITA, Fumie KIMURA, Shigefumi KADOHISA

Bull Fac Health Sci, Okayama Univ 9 ( 2 ) 83 - 90 1999年

記述言語：英語出版者・発行元：岡山大学医療技術短期大学部

Extended-cycle process is the term used for a processor in which the processing time has been prolonged usually to approximate 210 seconds. It has been known that the extended-cycle process of some single-emulsion films as used for mammography may enhance film contrast and increasefilm speed. So the speed was increased in lower speed and higher resolution system than conventional systems by means of using the extended-cycle process in this paper. We investigated how much the resolution of the system was kept. A single screen-single emulsion combination, KonicaM-100/CM-H was employed as a low speed and high resolution system. This film after exposure was processed in the different combinations of developing temperatures, 30, 32 and 34℃, and processing time of 210 seconds. On the other hand, Konica M-200/CM-H was employed as a high speed system. This film was processed in the standard-cycle processing (34℃, 90 seconds). Those systems were compared on contrast, speed, screen-film blur and noise by a characteristic curve, MTF (modulation transfer function) and WS (wiener spectrum). Furthermore, the RMI 165 phantom was used to evaluate visibility of mammographic details of these systems. As a result, in the extended-cycle process at the developing temperatures of 32 or 34°C andprocessing time of 210 seconds for M-100/CM-H, it was possible to increase the speed as much as the higher speed system, M-200/CM-H. Then the contrast, the MTF and the visibility were also improved as compared to the higher speed system. Furthermore patient dose could be reduced atthe developing temperature of 34℃ and processing time of 210 seconds in M-100/CM-H.通常,extended-cycle processは処理時間が約210秒に延ばされた現像機のために使われる用語である｡乳房撮影に使われるような片面乳剤フィルムにおけるextended-cycle processは,フィルムコントラストを増し,感度をあげることが良く知られている｡そこで,本論文ではextended-cycle processにより低感度,高解像度システムの感度を上げ,どの程度解像度が維持されるかを調べた｡片面増感紙／片面フィルムの組合わせであるKonica M-100/CM-Hを低感度,高解像度システムとして用いた｡露光後のフィルムは現像温度30,32, 34度,処理時間210秒の異なる組合わせで現像処理した。一方,高感度システムとしてKonica M-200/CM-Hを用い,このフィルムは標準現像(34℃,90秒)された｡感度,増感紙／フイルムのぼけ,雑音に関して,特性曲線,MTF(modulation transfer function), WS(wiener spectrum)によってこれらのシステムを比較した｡さらにこれらのシステムにおける乳房写真の細部視覚評価のためにRM165ファントムを使用した｡その結果,M-100/CM-Hに対するextended-cycle process現像温度32, 34℃,処理時間210秒のextended-cycle processにおいて,高感度システムM-200/CM-Hと同等の感度を上げることが可能であった｡そのとき,コントラスト,MTF,視覚的検出能も高感度システムより向上した｡さらに,現像温度34℃,処理時間210秒では,被曝線量の低減が可能であった｡

その他リンク： http://eprints.lib.okayama-u.ac.jp/15252

マンモグラフィ用フィルムにおけるフィルム粒状度の測定査読

後藤佐知子, 東義晴, 丸山敏則, 中桐義忠, 杉田勝彦

日本放射線技術学会誌 55 ( 11 ) 1115 - 1121 1999年

担当区分：筆頭著者記述言語：日本語出版者・発行元：公益社団法人日本放射線技術学会

Film graininess can be measured by providing air spaces between the screen and film in the screen-film system. In this study, the necessary air spaces were investigated to measure mammographic film graininess by using a mammography unit at the low tube voltage of 28 kV. Wiener spectra were measured with the screen held 1, 3, 6, 9,15, 21, and 30 mm from the film at densities of 0.8 and 1.3. Konica New CM film with a Konica M-150 screen was employed in this investigation. Results showed that Wiener spectral values were almost constant at densities of 0.8 and 1.3 when the air spaces were 9 mm or more. That is, it was considered that film graininess was evaluated independently by blurring quantum mottle, and 15 mm air spaces were used to provide a safety margin. Furthermore, film graininess of three mammographic films, Fuji UM-MA HC (with a Fuji UM MAMMO Fine screen), Kodak Min-R 2000 (with a Kodak Min-R 2000 screen), and Kodak Min-R M(with a Kodak Min-R Medium screen)were measured with 15 mm air spaces. Min-R 2000 film had the lowest Wiener spectral values for film graininess at low spatial frequencies.

DOI： 10.6009/jjrt.KJ00000921418

腹部単純X線撮影時の被曝線量 -岡山県下の病院の現況- 査読

中桐義忠, 東義晴, 丸山敏則, 渋谷光一, 後藤佐知子, 杉田勝彦, 森岡泰樹, 門久繁文, 井上龍也, 平木祥夫

環境制御 20 ( 20 ) 17 - 21 1998年

記述言語：日本語出版者・発行元：岡山大学環境管理センター

In 1995, we have published a paper about the basic data on the relation between X-ray exposure equipment and patient dose in Vol. 17 of the Journal "Environment Research and Control". In this time, we questioned hospitals in Okayama Prefecture about exposure equipments of abdomen. And we compared each hospital's exposure equipments with the basic data, calculated each patient dose, then we studied that differences. Various imaging system, for example; screen/film or imaging plate has been used at each hospitals, so that exposure are various and patient doses are very different. The exposure equipment decide that the X-ray photograph is good or bad, so we cannot treat it easily. But we think that we have to try to take X-ray photographs which are suit the purpose of diagnosis which as a small patient dose as possible.

The Influence of Film Processing Temperature and Time on Mammographic film Characteristics 査読

Maruyama Toshinori, Goto Sachiko, Azuma Yoshiharu, Nakagiri Yoshitada, Shibuya Koichi, Sugita Katsuhiko, Takeuchi Tomoyuki, Honda Mitsugi, Yoshida Akira

Bull.Sch.Health Sci.Okayama Uni. Vol.8 No.2 ( 2 ) 121 - 129 1998年

記述言語：英語出版者・発行元：岡山大学医療技術短期大学部

The influence for developing temperature and processing time within film processing conditions was investigated using four mammographic films, Konica New CM, Fuji UM-MA HC, Kodak Min-R M and Kodak EB/RA (for rapid system). And Fuji UR-2, a double-emulsion film, was used as a control. Those sensitometric strips exposed by a sensitometer were processed in the different combinations of developing temperatures ranging from 28 to 36℃, processing times from 45 to 210 sec. Average gradient, relative speed and base plus fog obtained from the measured film characteristiccurves were evaluated for the different developing temperatures and times. Fuji UR-2 was scarcely affected and mammographic films were greatly affected in the different combinations without an increase in base plus fog except EB/RA. In New CM, UM-MA HC and Min-R M, the average gradients and the relative speeds increased as the developing temperature was higher and the developing time was longer, but the increases were limit on the combination of 36℃ and 210 sec in New CM and UM-MA HC. In EB/RA, the average gradients were almost constant and the relative speeds increased slightly like the double-emulsion film. These results suggested that it would bepossible to contribute to dose reduction and advancement of contrast in New CM, UM-MA HC and Min-R M by changing these processing parameters.フィルム処理条件において,現像温度と処理時間に対する影響を4種類のマンモグラフィ用フィルムKonica New CM, Fuji UM-MA HC,Kodak Min-R M,迅速処理用Kodak EB/RAについて調べた｡そして,比較基準用として両面乳剤フィルムFuji UR-2を用いた｡感光計で露光したフィルムを現像温度28～36℃,処理時間45～210秒で処理した｡特性曲線から得られたフィルム特性（平均階調度,相対感度,カブリ濃度）を異なる現像温度,現像時間に対して評価した｡UR-2はほとんど影響を受けず,マンモグラフィ用フィルムは,カブリ濃度が上昇することなく,現像条件の影響を大きく受けた。New CM, UM-MA HC,Min-R Mは現像温度の上昇,処理時間の延長に伴い,平均階調度と相対感度は増加した｡しかし,New CM, UM-MA HCの36℃,210秒で増加は限度に達した｡EB/RAの平均階調度は一定で,相対感度は両面乳剤フイルムと同様にわずかな増加であった｡これらの結果は,New CM, UM-MA HC, Min-R Mにおいて,処理条件を変化させることにより,被曝低減,コントラスト向上に貢献できる可能性を示唆していた｡

その他リンク： http://search.jamas.or.jp/link/ui/1998146743

マンモグラフィ用フィルムにおけるextended-cycle processの基礎的研究 : コントラスト, 相対感度

丸山敏則, 後藤佐知子, 東義晴, 中桐義忠, 杉田勝彦

日本放射線技術学会雑誌 53 ( 11 ) 1697 - 1704 1997年

記述言語：日本語出版者・発行元：公益社団法人日本放射線技術学会

The effectiveness of the extended-cycle process, in which processing time is longer than the manugacturer's recommendation, was investigated using four mammographic films, Konica New CM, Fuji UM-MA HC, Kodak Min-R 2000, and Kodak Min-R M, Fuji UR-2, a double-emulsion film, was used as a control. The sensitometric strips exposed by a sensitometer were processed in different combinations of developing temperatures ranging from 28 to 36℃, processing times from 45 to 210 sec chemicals, Konica XD-90C, Fuji RD-5 and Kodak RP X-Omat. Those characteristics(average gradient, relative speed, base plus fog)obtained from characteristic curves were evaluated for the different developing temperatures, times and chemicals. Fuji UR-2 was scarcely affected, while mammographic films were greatly affected in the different combinations without an increase in base plus fog. For New CM, UM-MA HC and Min-R M, the average gradient and relative speed increased as developing temperature increased and developing time was extended, but the increases were limited with the combination of 36℃ and 210 sec for New CM and UM-MA HC. For Min-R 2000, the average gradient was almost constant, and the relative speed increased like the other three mammographic films. Changes in average gradient and relative speed due to chemical variations showed increases or decreases from 6% to 9% compared with Konica chemical. These results suggested that the extended-cycle process for the above mammographic films has the possibility to contribute to dose reduction and advancement of contrast on mammography.

DOI： 10.6009/jjrt.KJ00001355420

302 X線乳房撮影における Extended-cycle Process

後藤佐知子, 丸山敏則, 東義晴, 中桐義忠, 杉田勝彦, 吉田彰

日本放射線技術学会雑誌 53 ( 8 ) 1174 - 1174 1997年

Ｘ線撮影領域での体内線量分布の測定査読

高田義明, 中桐義忠, 稲村圭司, 栞原菊次, 升谷敬彦, 田原誠治, 宇野弘文, 三上泰隆, 東義晴, 渋谷光一, 後藤佐知子, 杉田勝彦

日本放射線技師会雑誌 41 ( 5 ) 524 - 529 1994年5月

顎関節断層X線写真の画像診断支援システム最大開口時の下顎頭移動量の定量化査読

東義晴, 後藤佐知子, 中桐義忠, 杉田勝彦, 竹内知行, 岸幹二, 窪木拓男, 山下敦

岡山歯学会雑誌 13 ( 2 ) 223 - 231 1994年

顎関節断層X線写真の画像診断支援システム自動二値化処理による線図化ならびにその解析査読

東義晴, 後藤佐知子, 中桐義忠, 杉田勝彦, 竹内知行, 岸幹二, 窪木拓男, 山下敦

岡山歯学会雑誌 12 ( 2 ) 265 - 272 1993年

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