Development of medical x-ray imaging system using semiconductor array for reduction of patient dose

开发使用半导体阵列的医用 X 射线成像系统以减少患者剂量

• 批准号: 08557140
• 负责人: KANAMORI Hitoshi
• 金额: $ 4.42万
• 依托单位: Fukui University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08557140/
• 关键词: medical x-ray image; semiconductor array; CdTe semiconductor detector; patient dose; image quality; anti-scatter grid; 画質

(1)Using the traveling heat method for the crystal growth of CdTe semiconductor, uniformity and stability of semiconductor detector array were improved.(2)Digital chest images were made using a CdTe semiconductor detector array having 3000 pixels. The spatial resolution was inferior compared with those made using screen-film systems, but the density resolution was superior. This suggests the utility of the compression of the dynamic range in the image processing.(3)Measurements of x-ray spectra using a CdZn Te semiconductor detector system for 50-150kV and 25-35kV x-ray generators were performed.(4)Factors of anti-scatter grids (the scatter ratio, the Bucky factor and the contrast improvement factor) were obtained from scatter and primary x-ray spectra.(5)Small angle scattered spectra which were not removed by the gril were obtained. It was suggested that the small angle scatter could not be ignored.(6)Tube voltage dependence of MTF's of screen-film systems were explained by the effect of scattered x rays. A new equation was proposed for thick screens, instead of Rossmann's equation

（1）采用行波热法生长CdTe半导体晶体，提高了半导体探测器阵列的均匀性和稳定性。（2）使用具有3000像素的CdTe半导体探测器阵列制作数字胸部图像。与使用屏幕-胶片系统制作的图像相比，空间分辨率较差，但密度分辨率上级。这表明在图像处理中动态范围的压缩的效用。（3）用CdZnTe半导体探测器系统测量了50- 150 kV和25- 35kVX射线发生器的X射线谱。（4）由散射谱和一次谱求出防散射栅的散射比、Bucky因子和对比度改善因子。（5）获得了未被格栅去除的小角散射光谱。结果表明，小角度散射是不可忽略的。（6）用X射线散射效应解释了屏-片系统MTF与管电压的关系。本文提出了一个新的厚筛筛孔厚度公式，取代了Rossmann公式

项目成果

滝川 厚: "CdZnTe検出器を用いた骨密度測定装置のX線スペクトル測定" 日本写真学会雑誌. 60・3. 196-199 (1997)

Atsushi Takikawa：“使用CdZnTe探测器的X射线光谱测量”日本摄影学会杂志196-199（1997）。

H.Arimura: "Tube voltage dependence of modulation transfer function for a rare-earth screen film system" Journal of The Society of Photographic Science and Technology of Japan. 60・3(印刷中). (1997)

H.Arimura：“稀土屏幕胶片系统的调制传递函数的管电压依赖性”日本摄影科学技术学会杂志 60・3（出版中）。

松本 政雄: "CdTe,TdZnTe検出器を用いて測定した診断用X線スペクトルの補正" 放射線. 22・3. 63-72 (1996)

Masao Matsumoto：“使用 CdTe、TdZnTe 探测器测量的诊断 X 射线光谱的校正”放射学 22・3 (1996)。

H.Kanamori: "Edge enhancement effect of radiographs" Medical & Biological Engineering & Computing. 35・S2. 1143 (1997)

H.Kanamori：“射线照片的边缘增强效果”医学与生物工程与计算 35・S2（1997）。

A.Takigawa: "Effects of antiscatter grid on x-ray spectram and radiographic" Journal of Photographic Science. 44・3. 93-98 (1996)

A.Takikawa：“抗散射网格对 X 射线光谱和射线照相的影响”《摄影科学杂志》44・3（1996 年）。