Faculty Profiles - KIDA Katsuhiro

Papers - KIDA Katsuhiro

Division display 1 - 18 of about 18 ／ All the affair displays >>

超音波診断装置を用いた第1趾爪甲の荷重による広がりの定量的検討 Reviewed

石川静香, 齋藤誠二, 木田勝博, 長尾洋, 五福明夫, 森本美智子

人間工学 61 ( 1 ) 43 - 50 2025.2

Language：Japanese Publisher：(一社)日本人間工学会

本研究は,足趾に荷重をかけることによる第1趾爪甲の広がりを定量的に明らかにすることを目的とした.爪病変のない20歳代と40歳以上の2群に対して,座位,立位,立位でMP関節30度伸展位(MP関節30度)の3条件にて,足趾圧の計測と超音波画像の取得を水浸法で同時に行った.画像処理により爪甲の広がりを表す爪高指数を求めた.そして,完全接地群と浮き趾群の2群に分類し,爪高指数との関連を検討した.その結果,年代には関係なく座位,立位,MP関節30度の順に,有意に足趾圧は増加し,爪高指数は低下した.また,対象者全体の完全接地群は13.5%,浮き趾群は86.5%であったが,足趾接地に関係なく足趾に圧力が加わる姿勢により,爪高指数は有意に低下した.以上のことから,年代や足趾接地を問わず,足趾への荷重により爪甲が広がることが明らかとなった.(著者抄録)

researchmap

Investigating the Effects of Reconstruction Conditions on Image Quality and Radiomic Analysis in Photon-counting Computed Tomography. Reviewed International journal

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

Language：English Publishing type：Research paper (scientific journal)

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

PubMed

researchmap

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

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

Aktualności Neurologiczne 2024.7

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

Takuya Akagawa, Ryohei Fukui, Katsuhiro Kida, Ryutaro Matsuura, Makoto Shimada, Mitsuhiro Kinoshita, Yoko Akagawa, Sachiko Goto

Acta medica Okayama 78 ( 3 ) 215 - 225 2024.6

Language：English Publishing type：Research paper (scientific journal)

We propose a sitting position that achieves both high image quality and a reduced radiation dose in elbow joint imaging by area detector computed tomography (ADCT), and we compared it with the 'superman' and supine positions. The volumetric CT dose index (CTDIvol) for the sitting, superman, and supine positions were 2.7, 8.0, and 20.0 mGy and the dose length products (DLPs) were 43.4, 204.7, and 584.8 mGy • cm, respectively. In the task-based transfer function (TTF), the highest value was obtained for the sitting position in both bone and soft tissue images. The noise power spectrum (NPS) of bone images showed that the superman position had the lowest value up to approx. 1.1 cycles/mm or lower, whereas the sitting position had the lowest value when the NPS was greater than approx. 1.1 cycles/mm. The overall image quality in an observer study resulted in the following median Likert scores for Readers 1 and 2: 5.0 and 5.0 for the sitting position, 4.0 and 3.5 for the superman position, and 4.0 and 2.0 for the supine position. These results indicate that our proposed sitting position with ADCT of the elbow joint can provide superior image quality and allow lower radiation doses compared to the superman and supine positions.

DOI： 10.18926/AMO/67196

PubMed

researchmap

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

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

Radiological Physics and Technology 2024.6

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

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

Egyptian Pediatric Association Gazette 71 ( 1 ) 2023.11

Publishing type：Research paper (scientific journal) Publisher：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

researchmap

Other Link： https://link.springer.com/article/10.1186/s43054-023-00232-4/fulltext.html

3D phase-sensitive inversion recovery sequence for intracranial vertebrobasilar artery dissection. Reviewed International journal

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 2023.10

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

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

PubMed

researchmap

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

Ryohei Fukui, Ryutarou Matsuura, Katsuhiro Kida, Sachiko Goto

Progress in Medical Physics 34 ( 3 ) 23 - 32 2023.9

Toenail Plate Size Measurement Through the Water-bath Method Using an Ultrasound System Reviewed

ISHIKAWA Shizuka, SAITO Seiji, KIDA Katsuhiro, NAGAO Yoh, SASAKI Shinsuke

The Japanese Journal of Ergonomics 59 ( 4 ) 159 - 167 2023.8

Language：Japanese Publisher：Japan Human Factors and Ergonomics Society

Diagnosis and assessment of nail lesions require an understanding of normal anatomical structures and information on their size. However, accurate measurement of the toenail plate on the nail bed has not been reported. This study investigated the usefulness and validity of a method of drawing and measuring the toenail plate through the water-bath method using an ultrasound system. The ultrasound images of the gel and water-bath methods of participants without nail lesions were compared. The thickness of the toenail plate was measured over time in the water. In addition, the thickness, height, width, and nail height index of the toenail plate of participants in their 20s and 40＋ age groups were compared. The results showed that the water-bath method clearly depicted the toenail plate without artifacts. The thickness of the immersed toenail plate remained unchanged at 0 mm, and no significant difference was observed. Furthermore, significant differences were observed in the thickness, height, and nail height index of the toenail plate of participants in their 20s and 40＋ age groups. These results demonstrate that this method can clearly image the toenail structure, and measure and evaluate the toenail plate.

DOI： 10.5100/jje.59.159

CiNii Books

researchmap

3D phase-sensitive inversion recoveryを多発性硬化症に応用するための基礎的検討(Fundamental study for application of 3D phase-sensitive inversion recovery sequence to multiple sclerosis) Reviewed

榎卓也, 城本航, 木田勝博, 後藤佐知子, 琴浦規子

JART: 日本診療放射線技師会誌 70 ( 6 ) 580 - 587 2023.5

Language：English Publisher：(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)

researchmap

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

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

Progress in Medical Physics 33 ( 4 ) 1 - 9 2022.12

Non-electrocardiogram-gated and Non-contrast-enhanced Magnetic Resonance Angiography of the Lower Limb Arteries Using Three-dimensional Multishot T₁-weighted Fast-field Echo-Echo Planar Imaging Reviewed

Komaki Shinsuke, Kida Katsuhiro, Hayashi Yukako, Shouda Takashi, Tabuchi Akihiko

Japanese Journal of Radiological Technology 78 ( 4 ) 333 - 341 2022

Effect of the Number of Projected Images on the Noise Characteristics in Tomosynthesis Imaging Reviewed International coauthorship International journal

Ryohei Fukui, Ryutaro Matsuura, Katsuhiro Kida, Sachiko Goto

Progress in Medical Physics 32 ( 2 ) 50 - 58 2021.6

進行性核上性麻痺の各臨床病型における特徴,各種検査所見およびその予後

武久康, 遠部佳寿美, 渡邉竜也, 安藤研介, 河崎さおり, 戸田逸美, 西本めぐみ, 木田勝博, 都能和俊, 秋友信男, 梶谷努, 林英博

岡山赤十字病院医学雑誌 26 2015

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

Katsuhiro Kida, Sachiko Goto, Yoshiharu Azuma

European Journal of Radiology 81 ( 5 ) 846 - 850 2012.5

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 Reviewed

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 ( 3 ) 313 - 318 2012.3

3.0-T MRIにおける拡散強調像の評価

木田勝博, 後藤佐知子, 黒崎貴雅, 梶谷努, 東義晴

岡山赤十字病院医学雑誌 23 ( 1 ) 49 - 54 2012

頸部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

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 27 - 30 2011.11

Authorship：Lead author Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：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)

researchmap

　 PREV - NEXT 　

< KIDA Katsuhiro >

Papers - KIDA Katsuhiro