Three dimensional image construction of heavy ion CT with use of residual range measurement

利用残差测量的重离子CT三维图像构建

• 批准号: 13470188
• 负责人: NISHIMURA Katsuyuki
• 金额: $ 8.9万
• 依托单位: Ibaraki Prefectural University of Health Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13470188/
• 关键词: heavy ion CT; range; relative electron density; 3D display wavelet theory; wavelet theory; spatial resolution; multiple coulomb scattering; ICCD camera; 均一補正; ビーム強度補正; 分光スペクトル; 多重散乱; フィルタ逆投影法; 逐次近似法; ビデオ信号; レンジシフタ; CCDカメラ

The aim of this research is to seek high-speed acquisition and high quality image, by analyzing spatial resolution and contrast resolution and to verify the feasibility of three-dimensional display of heavy ion CT image. Heavy ion CT apparatus was developed. The apparatus consisted of ^<14>C ion beam with 400Mev/u, computer controllable range shifter, fluorescent screen, ICCD video camera. Higher speed acquisition was realized with use of high-speed range modulator and with the development of acquisition program. The contributions of Coulomb multiple scattering, blurring at both the fluorescent screen and CCD video camera system to spatial resolution were analyzed separately and compared with overall spatial resolution. Theoretical relation explains well the results. The electron density resolution was measured as 0.02 relative to water. This agrees with that calculated with use of noise propagation theory from the noises on the projection image. Noise was reduced by the image processing applying the wavelet theory without degrading the spatial resolution. As the projection data were acquired with two-dimensional detector, volume data were useable. Surface rendering images were constructed from the volume data.

本研究的目的是寻求高速采集和高质量图像，通过分析空间分辨率和对比度分辨率，验证重离子CT图像三维显示的可行性。研制了重离子CT装置。该装置由<14>400 Mev/u的~（13）C离子束、计算机控制的量程转换器、荧光屏、ICCD摄像机等组成。利用高速距离调制器和采集程序的开发，实现了更高速度的采集。分析了库仑散射、荧光屏模糊和CCD摄像系统模糊对空间分辨率的贡献，并与整体空间分辨率进行了比较。理论关系很好地解释了结果。电子密度分辨率测量为0.02相对于水。这与利用噪声传播理论从投影图像上的噪声计算的结果一致。在不降低图像空间分辨率的前提下，应用小波理论对图像进行降噪处理。由于投影数据是用二维探测器采集的，因此体积数据是可用的。从体积数据构建表面渲染图像。

项目成果

Tetsuya Tomida, Katsuyuki Nishimura, Shinji Abe, Hitoshi Satoh, Hiroshi Muraishi, Akio Hashimoto, Tetsuo Inada, Shuichi Tazawa, Tatsuaki Kanai, Kiyomitsu Kawachi: "Improvement of Acquisition Speed in Heavy Ion CT System (in Japanese)"Jpn J Med Phys.. 22[S

Tetsuya Tomida、Katsuyuki Nishimura、Shinji Abe、Hitoshi Satoh、Hiroshi Muraishi、Akio Hashimoto、Tetsuo Inada、Shuichi Tazawa、Tatsuaki Kanai、Kiyomitsu Kawachi：“重离子 CT 系统采集速度的改进（日语）”Jpn J Med Phys。

Naruomi Yasuda, Shinji Abe, et al.: "The Noise Power Spectrum in Heavy Ion CT Based on Measurement of Residual Range Distribution"Proceedings of The Third Korea-Japan Joint Meeting on Medical Physics. 228-230 (2002)

安田成臣、阿部真司等：《基于残差分布测量的重离子CT噪声功率谱》第三届韩日医学物理联席会议论文集。

Tetsuo Inada, Tetsuya Tomida, Tatsuya Fujisaki, Hiroshi Muraishi, Yasuyuki Futami, Tatsuaki Kanai, Toshiaki Irie, Kiyomitsu Kawachi, Shuichi Tazawa, Mitsutaka Kakeno: "Application of a Imaging Plate to Measurement of Resolution for Heavy Ion Imaging"Jpn J

Tetsuo Inada、Tetsuya Tomida、Tatsuya Fujisaki、Hiroshi Muraishi、Yasuyuki Futami、Tatsuaki Kanai、Toshiaki Irie、Kiyomitsu Kawachi、Shuichi Tazawa、Mitsutaka Kakeno：“成像板在重离子成像分辨率测量中的应用”Jpn J

S.Abe, K.Nishimura, H Saitoh et al.: "Application of Imaging Plate to Measurement of Resolution for Heavy Ion Imaging"Jpn J.Med.Phys.. 21(52). 30-33 (2001)

S.Abe、K.Nishimura、H Saitoh 等：“成像板在重离子成像分辨率测量中的应用”Jpn J.Med.Phys.. 21(52)。

Shinji Abe, Katsuyuki Nishimura, Hitoshi Satoh et al.: "Heavy Ion CT system based on measurement of residual range distribution"Jpn J Med Phys. 22. 1-9 (2002)

Shinji Abe、Katsuyuki Nishimura、Hitoshi Satoh 等：“基于残余范围分布测量的重离子 CT 系统”Jpn J Med Phys。