1996 年 16 巻 4 号 p. 217-225
Radiographic diagnosis using heavy ion beam could be much more useful compared with proton radiography, especially in the deep seated lesion. Efficacy study on heavy ion radiography was performed in comparison with conventional X-ray radiography. Horizontal beam of carbon ion accelerated up to 400MeV/nucleon by HIMAC (Heavy Ion Accelerator in Chiba) of MRS (National Institute of Radiological Sciences) has been used throughout this work at a therapy room. The slight differences in soft tissue and the structure of low Z material such as Burger phantom in acrylate blocks were visualized by carbon ion radiography on the usual X-ray film placed at the falling edge of Bragg peak, while those could not be detected by X-ray. However, MTF curve obtained with high Z test chart plate for carbon ion fell bellow that for X-ray, since X-ray was better in detecting Z variation and in scattering problem.
