Development of quality control system of computed tomographic X-ray unit to decrease patient dose in diagnosis

开发计算机断层X射线机质量控制系统以减少患者诊断剂量

• 批准号: 12557223
• 负责人: MATSUMOTO Masao
• 金额: $ 4.1万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12557223/
• 关键词: X-ray CT system; Primary x-ray spectrum; 90°-scattered X-ray spectrum; CdZnTe detector; Monte Carlo simulation; CdZnTe検出器

We have attempted to calculate a primary X-ray -spectrum of CT (Computed Tomography) system. Dose rates of primary X-ray spectrum are very high, so we reduced dose rate by using carbon scatterer and enabled to measure 90℃ scattered spectrum with a CdZnTe detector. The primary X-ray spectrum can be calculated from measured data of 90℃ scattered spectrum by counting backwards. In counting backwards, we used not only Klein-Nishina coefficients but also response functions obtained by Monte Carlo methods, because Raylei scattering and multiple scattering maybe occur in carbon scatterer.In our results, the primary X-ray spectrum calculated from response functions obtained by Monte Carlo methods are roughly equivalent to that calculated from Klein-Nishina coefficients.

本文尝试计算了CT（Computed Tomography）系统的基本X射线谱。由于初级X射线谱的剂量率很高，我们采用碳散射体降低了剂量率，并使90℃散射谱的测量成为可能。由90℃散射谱的测量数据，通过倒计数，可以计算出初级X射线谱。由于Raylei散射和多重散射可能发生在碳散射体中，因此在反向计算时，我们不仅使用Klein-Nishina系数，而且使用Monte Carlo方法得到的响应函数，结果表明，由Monte Carlo方法得到的响应函数计算的初级X射线能谱与由Klein-Nishina系数计算的初级X射线能谱大致相当。

项目成果

S.Miyajima, H.Sakuragi, M.Matsumoto: "CdZnTe detector as an X-ray spectrometer"Physics of Medical Inaging, SPIE. 4320. 148-155 (2001)

S.Miyajima、H.Sakuragi、M.Matsumoto：“CdZnTe 探测器作为 X 射线光谱仪”医学成像物理学，SPIE。

S.Miyajima, K.Imagawa, M.Matsumoto: "The CdZnTe detector in the measurement of mammographic x-ray spectra"Radiation Detectors and Their Uses 2001, KEK Proc.. 2001・20. 97-105 (2001)

S.Miyajima、K.Imakawa、M.Matsumoto：“乳腺 X 射线光谱测量中的 CdZnTe 探测器”辐射探测器及其用途 2001，KEK Proc.. 2001・20 (2001)。

松本政雄 他6名: "間接型フラットパネルディテクタの物理特性の測定"日本写真学会誌. 63・4. 210-216 (2000)

Masao Matsumoto等6人：“间接平板检测器的物理特性的测量”日本摄影学会杂志63・4（2000）。

H. Arimura, T. Date, K. Morikawa, H. Kubota, M. Matsumoto and H. Kanamori: "Evaluation of patient skin doses and signal-to-noise ratios of radiographic images in x-ray imaging system"Abstract of 10th International Congress of The International Radiation P

H. Arimura、T. Date、K. Morikawa、H. Kubota、M. Matsumoto 和 H. Kanamori：“X 射线成像系统中患者皮肤剂量和放射线图像信噪比的评估”第 10 期摘要

H. Kanamori, Y. Asai, Y. Ozaki, H. Kubota and M. Matsumoto: "Optimum tube voltage for chest radiographs obtained by psychophysical analysis"Proceedings of the second Beijing International Congress of Medical Radiation Physics. 99-100 (2000)

H. Kanamori、Y. Asai、Y. Ozaki、H. Kubota 和 M. Matsumoto：“通过心理物理分析获得的胸片最佳管电压”第二届北京国际医学放射物理大会论文集。