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Development of quality control system for digital mammographic x-ray units to aim reduction of patient dose

开发数字乳腺 X 射线设备的质量控制系统，旨在减少患者剂量

基本信息

批准号：
17590452
负责人：
MATSUMOTO Masato
金额：
$ 1.98万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17590452/
关键词：
Digital mammographic x-ray unit Spectral measurement system Carbon or acrylic resin scatterer Digital characteristic curve Modulation Transfer Function (MTF)Wiener spectrum C-D phantom image Quality control system ディジタルマンモグラフィシス CDMAMファ

项目摘要

The analysis of x-ray spectra is important for quality assurance (QA) and quality control (QC) of radiographic systems. The aim of this study is to measure the digital mammographic x-ray spectra under clinical conditions using a high-resolution Schottky, CdTe detector. Under clinical conditions, the direct measurement of a mammographic spectrum is difficult because of the high photon fluence rates that cause significant detector photon pile-up. An alternative way of measuring the output spectra from a tube is first to measure the 90-degree Compton scattered photons from a given sample. With this set-up detector pile-up is not a problem. From the scattered spectrum one can then use an energy correction and the Klein-Nishina function to reconstruct the actual spectrum incident upon the scattering sample. The verification of whether our spectra measured by the Compton method are accurate was accomplished by comparing exposure rates calculated from the reconstructed spectra to those measur … More ed with an ionization chamber. We used aluminum (Al) filtration ranging in thickness from 0 to 0.8 mm. The difference rates to the dosimeter of the half-value layers (HVLs) obtained for a 27 kV beam were 17.5 % for carbon scatterer and 16.5 % for acrylic resin scatterer. For a 32 kV beam we obtained 12.8 % and 11.4 %. The small differences in HVLs obtained by both techniques suggest that Compton scatter spectroscopy with a high-resolution Schottky CdTe detector is suitable for measuring the digital mammographic x-ray spectra and useful for QA and QC of clinical digital mammographic x-ray equipment.Evaluation standard of phantom images in mammography guideline (second edition) published on March, 2004 including film outcome of digital images was indicated and evaluation of physical imaging properties (digital characteristic curve, modulation transfer function, noise power (Wiener) spectrum, detective quantum efficiency, detectorbility of CDMAM phantom) of digital mammography was explained. Less

X射线能谱分析是射线照相系统质量保证(QA)和质量控制(QC)的重要内容。本研究的目的是使用高分辨率的肖特基镉探测器测量临床条件下的数字化乳房X光照相X射线光谱。在临床条件下，直接测量乳房X光照相光谱是困难的，因为高光子注量率会导致探测器光子堆积。另一种测量管输出光谱的方法是首先测量给定样品的90度康普顿散射光子。在这种设置下，探测器堆积不是问题。从散射光谱中，人们可以使用能量校正和Klein-Nishina函数来重建入射到散射样品上的实际光谱。通过比较由重建光谱计算的曝光率和测量的…来验证我们的康普顿方法测量的光谱是否准确更多的是用电离室。我们使用了厚度从0到0.8 mm的铝(Al)过滤器。在27kV束上测得的半值层对剂量计的差异率，碳散射体为17.5%，丙烯酸树脂散射体为16.5%。对于32KV的梁，我们得到了12.8%和11.4%的结果。指出康普顿散射法和高分辨率肖特基镉镉探测器的康普顿散射谱适用于数字化乳房X线片的测量，可用于临床数字化乳房X线机的质量保证和质量控制。介绍了2004年3月发布的《乳房X光检查指南》(第二版)中体模图像的评价标准，包括数字图像的胶片结果，并对数字乳房X光检查的物理成像特性(数字特征曲线、调制传递函数、噪声功率(维纳)谱、量子效率、CDMAM体模的可探测性)的评价进行了说明。较少

项目成果

期刊论文数量（25）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Measurement of position dependence of spectral distribution in primary x-ray beam of CT system using Compton spectroscopy

使用康普顿光谱测量 CT 系统主 X 射线束中光谱分布的位置依赖性

DOI：
发表时间：
2005
期刊：
Proceeding of the 19^<th> Workshop on Radiation Detectors and Their Uses 2005・12
影响因子：
0
作者：
Masao Matsumoto;Koji Maeda
通讯作者：
Koji Maeda

Spectral measurement of diagnostic x-ray unit

诊断 X 射线装置的光谱测量

DOI：
发表时间：
2005
期刊：
Japanese Journal of Medical Physics 25・Sup.4
影响因子：
0
作者：
Dodds;A.W.;KIBI Noboru;M.Matsumoto
通讯作者：
M.Matsumoto

Effect of scatterer on mammographic x-ray spectra measured by Compton spectroscopy

散射体对康普顿光谱测量的乳腺 X 射线光谱的影响

DOI：
发表时间：
2006
期刊：
Radiation Detectors and Their Uses, KEK Proceedings 2006-7
影响因子：
0
作者：
Masao Matsumoto;Kentaro Onishi;Chikako Tanaka
通讯作者：
Chikako Tanaka

Novel display technique for reference images for visibility of temporal change on radiography -Color digital summation radiography-

用于参考图像的新颖显示技术，可在放射线照相上显示时间变化 -彩色数字求和放射线照相 -

DOI：
发表时间：
2006
期刊：
Radiation Medicine 24・1
影响因子：
0
作者：
Ogata Y;Naito H;Tomiyama N;Hamada S;Tsubamoto M;Inoue A;Murai S;Sumikawa H;Ueguchi T;Matsumoto M;Tamura S;Nishinosono H;Nakamura H;Johkoh T
通讯作者：
Johkoh T

Evaluation of physical imaging properties of Digital mammography

数字乳腺X线摄影物理成像特性的评估