Faculty Profiles - GOTO Sachiko

MISC - GOTO Sachiko

Division display 21 - 40 of about 70 ／ All the affair displays >>

Increasing the sensitivity of the dosimetry system for high energy x-rays, using Gafchromic EBT film and a flat-bed scanner with sharp cut

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

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

High accuracy measuring method of absorbed dose using Radiochromic Film and a micro-densitometer for high-energy x-rays

Hideki Aoyama, Yoshiharu Azuma, Sachiko Goto, Tetsuhiro Sumimoto

SIGNAL ANALYSIS, MEASUREMENT THEORY, PHOTO-ELECTRONIC TECHNOLOGY, AND ARTIFICIAL INTELLIGENCE, PTS 1 AND 2 6357 2006

Language：English Publisher：SPIE-INT SOC OPTICAL ENGINEERING

Radiochromic film has been applied to mapping of dose distributions in radiation therapy. However, this particular RCF product suffers from intrinsic nonuniform response. In this study, we have carefully measured the nonuniformity of unirradiated RCF, and the response of irradiated RCF in pixel-to-pixel as function of various absorbed doses, in order to create a method of predicting the error of irradiated, unirradiated RCF.

DOI： 10.1117/12.716968

Web of Science

researchmap

Analysis of influence of digital mammography on the individual average glandular dose against screen-film system

Y. Azuma, S. Goto, T. Sumimoto, Y. Takeda

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

Estimation of breast density on digital mammograms

Sachiko Goto, Yoshiharu Azuma, Hideki Aoyama, Tetsuhiro Sumimoto

SIGNAL ANALYSIS, MEASUREMENT THEORY, PHOTO-ELECTRONIC TECHNOLOGY, AND ARTIFICIAL INTELLIGENCE, PTS 1 AND 2 6357 2006

Language：English Publisher：SPIE-INT SOC OPTICAL ENGINEERING

We built an estimation system of individual breast density from digital mammograms by using breast tissue equivalent phantoms that are able to change the mixture ratio of adipose and glandular tissue and the thickness. The method was compared with a visual assessment of breast density by the radiologists as a gold standard. The clinical image data set that consisted of 49 mammograms of 21 patients were analyzed. The average of the estimated glandular rate was 35.0%, while varying from 12.0% to 67.0%. This system can apply in clinical practice such as the visual estimation of breast density.

DOI： 10.1117/12.716998

Web of Science

researchmap

Analysis of BGA defects by tomographic images

T. Sumimoto, T. Maruyama, Y. Azuma, S. Goto, M. Mondou, N. Furukawa, S. Okada

SIGNAL ANALYSIS, MEASUREMENT THEORY, PHOTO-ELECTRONIC TECHNOLOGY, AND ARTIFICIAL INTELLIGENCE, PTS 1 AND 2 6357 2006

Language：English Publisher：SPIE-INT SOC OPTICAL ENGINEERING

To improve the cost of performance in manufacturing IC packages, it is required to inspect BGA defects in the online process. The problems of image analysis for the detection of defects are the detection accuracy and image processing time according to a line speed of production. Using the X-ray penetration equipment, we have captured images of an IC package to search an abnormal BGA. To get design data for the development of the inspection system, which can be used easily in the surface mount process, we tried to capture the tomographic images utilizing the latest imaging techniques.

DOI： 10.1117/12.716986

Web of Science

researchmap

放射線治療におけるＧＡＦクロミックフィルム用線量分布測定装置の開発

東義晴, 後藤佐知子

平成16年度〜平成17年度科学研究費補助金( 基盤研究(C)(2))研究成果報告書 2006

Measurement of Breast Density on DigitalMammograms

Sachiko Goto, Yoshiharu Azuma, Tetsuhiro Sumimoto, Yoshihiro Takeda, Naoko Tsujita, Shigefumi Kadohisa

Instrumentation and Measurement Technology 2006

High Accuracy Measurement System of Absorbed Dose Using Combination of Radiochromic Film and Micro-Densitometer for Radiation Therapy

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

Instrumentation and Measurement Technology 2006

Head multidetector-row CT angiography with low kV settings:improved vessel enhancement and noise reduction in phantom studies

Hiroyuki Hamaguchi, Takuya Akagawa, Youji Kimura, Koutarou Hashimoto, Kazutoshi Tsunou, Sachiko Goto, Yoshiharu Azuma

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

A-4-26 Improvement of Detectivity of Renal Artery in Non-contrast MR Angiography

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

Proceedings of the Society Conference of IEICE 2005 95 - 95 2005.9

Influence of image quality characteristics on the accuracy of vessel measurement using Multi-detector CT scanner

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

The Society of Instrument and Control Engineers 2005

Tomographic Image Analysis for Detection of Defects at BGA

T. Sumimoto, T. Maruyama, Y. Azuma, S. Goto, M. Mondou, N. Furukawa, S. Okada

The Society of Instrument and Control Engineers 2005

Estimation of Breast Density on Digital Mammograms

N. Tsujita, S. Goto, Y. Azuma, T. Sumimoto, S. Kadohisa

The Society of Instrument and Control Engineers 2005

Improvement in Measuring Accuracy of Radiochromic Film Density for High-Energy X-Rays

H. Aoyama, Y. Azuma, S. Goto, T. Sumimoto

The Society of Instrument and Control Engineers 2005

X-ray image analysis of defects at BGA for manufacturing system reliability

T Sumimoto, T Maruyama, Y Azuma, S Goto, M Mondou, N Furukawa, S Okada

Advanced Reliability Modeling 507 - 514 2004

Language：English Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

This paper deals with the image analysis of defects at BGA for the reliability in PC boards by using X-ray imaging. To assure the manufacturing reliability, an inspection system of BGA is required in the surface mount process. As we can find mostly solder bridge defects, we pay attention to detecting solder bridge in a production line. The problems of image analysis for the detection of defects at BGA solder joints are the detection accuracy and image processing time according to a line speed. To get design data for the development of the inspection system, which can be used easily in the surface mount process, we attempt to measure the shape of BGA based on X-ray imaging.

Web of Science

researchmap

ＧＡＦクロミックフィルムを用いた放射線治療における線量分布測定精度に関する研究

東義晴, 中桐義忠, 後藤佐知子

平成14年度〜平成15年度科学研究費補助金(基盤研究(C)(2))研究成果報告書 2004

Automatic Pattern Classification of The Digitized Mammographic Breast Density

Yoshiharu AZUMA, Sachiko GOTO, Tetsuhiro SUMIMOTO

Cybernetics and Information Technologies, Systems and Applications 2004

Detection of Defects of BGA by Tomography Imaging

TETSUHIRO SUMIMOTO, TOSHINORI MARUYAMA, YOSHIHARU AZUMA, SACHIKO GOTO, MUNEHIRO MONDOU, NOBORU FURUKAWA AND, SABURO OKADA

Cybernetics and Information Technologies, Systems and Applications 2004

Automatic pattern classification reliability of the digitized mammographic breast density

T Sumimoto, S Goto, Y Azuma

Advanced Reliability Modeling 499 - 506 2004

Language：English Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

The computer aided-system for the breast density pattern classification was built based on the researches of the objective quantification which converts breast density into glandular rate employing the phantom of the synthetic breast-equivalent resin material, and the subjective quantification of radiologists' visual assessment with the method of analysis of paired comparisons employing the Thurstone-Mosteller model. The system consists of the two processes. In the first process, pixels of a digitized mammogram are converted into glandular rates using the neural network to which the exposure conditions and the breast thickness were inputted. In the second process, the pattern classification and the glandular rate computation were performed taking visual assessment into consideration by the neural network to which feature values of the histogram of the glandular rate image converted into gray level were inputted. As a result of receiver operating characteristics (ROC) analysis estimating the pattern classification reliability to visual assessment in 93 samples, the area A(Z) under ROC curve was 0.95 or more values in each pattern. In the computed glandular rate to visual assessment, the maximum absolute error was 13% and the average absolute error was 3.4%.

Web of Science

researchmap

ＧＡＦクロミックフィルムを用いた放射線治療における線量分布測定精度に関する研究

東義晴, 中桐義忠, 後藤佐知子

INNERVISION 2004

　 PREV - NEXT 　

< GOTO Sachiko >

MISC - GOTO Sachiko