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A Study of Computer Tomography with Accelerated Proton Beam

加速质子束计算机断层扫描研究

基本信息

批准号：
07805040
负责人：
NAGASHIMA Yasuo
金额：
$ 1.34万
依托单位：
College of Medical Technology, The University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07805040/
关键词：
CT AMS 加速器 AMS 陽子線CT 断層撮影

项目摘要

A proton computer tomography (CT) has been proposed and investigated. A 12UD tandem accelerator is used to accelerate proton particles. The energy of the proton is 24MeV.Though the principal of the proton CT is similar to that of a X-ray CT,a new idea is requested to realize it because the interaction mechanism of the proton in the material strongly different from that of the X-ray. A new idea, which is named Residual Energy Method, is proposed and is gotten a tryout. According to the idea, a tomogram is made from the electronic stopping power of the proton at the each part of an absorption material. As comparison with the X-ray CT,we can expect several advantages in the proton CT.Here, the strong points are summarized. 1) A very high quality tomogram can be get with less proton irradiation to a person because of measurement of all proton particles which are irradiated. Then, it is expected the decrease of a specific dose of radioactivity. 2) In contradiction to the X-ray, the proton particle can be focused on a very small portion of the irradiated material with several kind of electromagnetic optical devices because it is charged particle, not electrostatic wave like X-ray. Consequently, it becomes easier to get the tomogram with very high specific resolution.The proton CT has been tried with a haunt. The diameter of the proton beam is controlled to be less than 0.1mm. The tomogram has been observed successfully. The space resolution is 0.25mm which is sufficient for medical usage. The trials are still under investigation.

提出并研究了质子计算机层析成像(CT)技术。12UD串列加速器用于加速质子粒子。质子的能量为24 MeV。虽然质子CT的原理类似于X射线CT，但由于质子在材料中的相互作用机制与X射线有很大的不同，因此需要一种新的思想来实现它。提出了一种新的方法--剩余能量法，并进行了试用。根据这个想法，层析图像是由质子在吸收材料的每一部分的电子阻止能力制成的。与X射线CT相比，我们可以预期质子CT具有几个优点。下面总结一下它的优点。1)由于测量了所有被辐照的质子粒子，所以可以在对人体较少的质子照射下获得非常高质量的断层图像。然后，预计特定剂量的放射性会减少。2)与X射线相反，由于质子粒子是带电粒子，而不是像X射线那样的静电波，所以利用几种电磁光学装置可以将质子粒子聚焦在被照射材料的很小一部分上。因此，获得非常高的特定分辨率的断层扫描变得更容易。质子CT已经尝试过了。质子束直径控制在0.1 mm以下。成功地观测到了层析图像。空间分辨率为0.25 mm，足以满足医用要求。审判仍在调查中。