Faculty Profiles - GOTO Sachiko

MISC - GOTO Sachiko

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CT減弱補正におけるCT撮影条件が骨SPECTの定量値に与える影響

中澤健吾, 中嶋真大, 後藤佐知子, 竹田芳弘, 本田貢

第17回中四国放射線医療技術フォーラム 62 - 62 2021.12

高吸収体がトモシンセシス画像ノイズ測定に与える影響

福井良性, 太田雄大, 沼田美保, 谷口菜摘子, 西岡早紀, 松浦龍太郎, 木田勝博, 後藤佐知子, 本田貢, 平木隆夫

第17回中四国放射線医療技術フォーラム 62 - 62 2021.12

Reduction of scan time for phase image of 3T magnetic resonance imaging to detect of calcification

Tomoka Doi, Katsuhiro Kida, Sachiko Goto, Yoshiharu Azuma, Takushi Kawashima, Takahiko Yokote, Tsutomu Kajitani

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) 2012.10

Exploration of brain activations by passive hand movements and subject’s intention based on Kawahira method using 3T-fMRI

Takushi Kawashima, Katsuhiro Kida, Satoshi Kuwahara, Takahiko Yokote, Tomoka Doi, Sachiko Goto, Yoshiharu Azuma

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record 2012

Detection of Calcification in Human Breast Using Phase Image of Magnetic Resonance Imaging

Katsuhiro Kida, Sachiko Goto, Tomoka Doi, Tsutomu Kajitani, Yoshiharu Azuma

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record 2012

Observation of activation brain areas in response to the stimulation by the right hand movement of Kawahira method using fMRI

Takahiko Yokote, Katsuhiro Kida, Satoshi Kuwahara, Takushi Kawashima, Tomoka Doi, Sachiko Goto, Yoshiharu Azuma

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record 2012

Observation of activation brain areas in response to the stimulation by the right hand movement of Kawahira method using fMRI

Takahiko Yokote, Katsuhiro Kida, Satoshi Kuwahara, Takushi Kawashima, Tomoka Doi, Sachiko Goto, Yoshiharu Azuma

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record 2012

Exploration of brain activations by passive hand movements and subject's intention based on Kawahira method using 3T-fMRI

Takushi Kawashima, Katsuhiro Kida, Satoshi Kuwahara, Takahiko Yokote, Tomoka Doi, Sachiko Goto, Yoshiharu Azuma

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record 2012

Detection of Calcification in Human Breast Using Phase Image of Magnetic Resonance Imaging

Katsuhiro Kida, Sachiko Goto, Tomoka Doi, Tsutomu Kajitani, Yoshiharu Azuma

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record 2012

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 2012

Evaluation of the ability of nonlinear noise reduction filter to the low-contrast object in Multi-Detector Row Computed Tomography using a digital phantom and power spectrum

S. Kondo, S. Goto, Y. Hyodo, T. Maruyama, Y. Azuma, R. Matsuura, K. Inamura

2011 IEEE International Conference on Imaging Systems and Techniques, IST 2011 - Proceedings 160 - 164 2011

Language：English

We propose a quantitative method to evaluate the ability of adaptive image filters for reducing noise to low-contrast objects in Multi-Detector Row Computed Tomography (MDCT). The digital phantom for evaluating the ability of a nonlinear noise reduction filter to a low-contrast object in a MDCT image was produced. The digital phantom consists of a water phantom image of MDCT and a bar pattern with a known contrast and spatial frequency. The edge-preserving adaptive filter for selectively eliminating noise in low-dose scanning known as the Quantum Denoising System developed by Toshiba Medical Systems was chosen as a nonlinear noise reduction filter for this paper. In this paper, two non-linear noise reduction filters, Q1 and Q2 in QDS were employed. By analyzing the power spectrum (PS) of a digital phantom, the filter performance as regards the contrast and spatial frequency of an object was investigated. The contrast-to-noise ratio from PS could express the feature of the filter briefly. That is, the validity of a filter can be shown based on the combined information of the contrast and spatial frequency of an object. Probably, this simple method will contribute to evaluating various noise reduction filters efficiently. © 2011 IEEE.

DOI： 10.1109/IST.2011.5962206

Detection of calcification using high-pass filtered phase image in magnetic resonance imaging for breast cancer screening

Katsuhiro Kida, Tsutomu Kajitani, Sachiko Goto, Yoko Tsuji, Toshinori Maruyama, Yoshiharu Azuma

2011 IEEE International Conference on Imaging Systems and Techniques, IST 2011 - Proceedings 224 - 228 2011

Language：English

To achieve detection of calcifications using magnetic resonance imaging (MRI) for breast cancer screening, we investigated combinations of an echo time (TE) and a high-pass filter size on phase images using a breast phantom. The breast phantom was made from gel area of 0.1 mmol/L gadopentetate dimeglumine and 2.0 wt% agar containing imitation calcifications to simulate calcification in the breast. To use the phase image for calcification assessment, optimization of TE was required since a difference of phase is enhanced at sufficiently long TE. However, longer TE tends to increase the static field inhomogeneity effects. To remove the static field inhomogeneity effects, we employed a high-pass filter processing. Then, several different filter sizes were tested to optimize the visualization of calcification. TE of 48 msec had the highest contrast between imitation calcifications and gel area. The high-pass filter size of 6464 pixels was able to remove efficiently the background phase effects. The high-pass filtered phase image was able to show imitation calcifications as hyperintense areas. Although the limit of detection of imitation calcifications was 1.0 mm, it suggests a possibility that the high-pass filtered phase image is able to use for breast cancer screening and diagnosis without pain by compression or the use of ionizing radiation. © 2011 IEEE.

DOI： 10.1109/IST.2011.5962192

フラットベッドスキャナの3カラーチャンネルすべてを用いるラジオクロミックフィルム線量測定(第66回総会学術大会放射線防護・管理関連演題発表後抄録)

大山博信, 青山英樹, 東義晴, 後藤佐知子, 丸山敏則, 稲村圭司

放射線防護分科会会誌 ( 31 ) 31 - 31 2010.10

Optimization of Combination of Voxel Size and Flip Angle by Visual Evaluation for Renal Magnetic Resonance Angiography without a Contrast Agent

K. Kida, S. Goto, Y. Azuma

IFMBE Proceedings 364 - 367 2009.9

The single emission spectrum densitometry for radiochromic films by flat-bed document scanner with transparency unit employing light emitting diode

Yoshiharu Azuma, Hideki Aoyama, Sachiko Goto

2008 IEEE INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONFERENCE, VOLS 1-5 294 - 298 2008

Language：English Publisher：IEEE

We developed an infrared flat-bed scanner with a transparency unit (IR-4000, iMeasure, Inc.) in order to increase the sensitivity of the measuring density of Radiochromic film, Gafchromic film EBT model. Radiochromic film hay been used for many years as a two-dimensional radiation detector for dosimetry in radiotherapy. One of the commercially available Radiochromic films today is the Gafchromic film EBT model (EBT) manufactured by ISP (International Speciality Products, Wayne, NJ). EBT has the absorption spectrum with a maximum absorption band centered at 636 nm Consequently the response of EBT will be enhanced by measuring with a red light. The transparency unit of IR-4000 for EBT hay a light emitting diode (LED) with a peak wavelength of 630 nm, and was produced by replacing a white light in the transparency unit for the flat-bed scanner (ES-2200, Seiko Epson Corp) with the LEDs. IR-4000 could improve the sensitivity for EBT in all dose ranges However, we had to consider the methods for decreasing noise. We examined for IR-4000 how to keep the high sensitivity and reduce noise. Multiple scans and the reduction of the image resolution by pixel averaging, which was effective in noise reductio?; were employed. IR-4000 is a useful densitometry device to GAFs since optional transparency units which have various single emission spectra are prepared

DOI： 10.1109/IMTC.2008.4547049

Magnetic Resonance Angiography of Renal Arteries using Contrast Behavior between Water and Fat during the Transient Phase of Steady State of Signal on Balanced Turbo Field Echo Sequence

Katsuhiro Kida, Sachiko Goto, Yoshiharu Azuma

2008 IEEE Instrumentation and Measurement Technology Conference 1223 - 1228 2008

Detectibility of renal artery under high resolution MR angiography using steady state free precession sequence in phantom study

Katsuhiro Kida, Yoshiharu Azuma, Sachiko Goto, Tsutomu Kajitani, Tetsuhiro Sumimoto

World Congress on Medical Physics and Biomedical Engineering 2006 1591 - 1594 2006.8

Relations Between Accuracy of Vessel Measurement and Physical Image Quality Characteristics inMulti-detector CT Scanner

Y. Azuma, T. Akagawa, H. Hamaguchi, S. Goto, T. Sumimoto

Instrumentation and Measurement Technology 2006

Detectibility of renal artery under high resolution MR angiography using steady state free precession sequence in phantom study

Katsuhiro Kida, Yoshiharu Azuma, Sachiko Goto, Tsutomu Kajitani, Tetsuhiro Sumimoto

the World Congress on Medical Physics and Biomedical Engineering 2006(WC2006) 2006

Development of infrared flat-bed scanner with transparency unit employing light emitting diode for Gafchromic EBT film

Hideki Aoyama, Yoshiharu Azuma, Sachiko Goto, Hirofumi Hato, Tetsuhiro Sumimoto

the World Congress on Medical Physics and Biomedical Engineering 2006(WC2006) 2006

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