Positron camera for range verification of heavy-ion radiotherapy
Positron camera for range verification of heavy-ion radiotherapy
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DOI：
10.1016/j.nima.2003.07.005
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发表时间：
2003-12-11
影响因子：
1.4
通讯作者：
Sakai, H
中科院分区：
文献类型：
--
作者：
Iseki, Y;Mizuno, H;Sakai, H
一台由一对激怒型闪烁探测器组成的正电子相机已经被开发出来，通过使用正电子发射器光束来验证射程。每个探测头都配有NaI(Tl)晶体(直径：600 mm，厚度：30 mm)，以提高探测效率。为了获得较低的计数率，设计了一种灵活的测量和软件分析电路。为了提高测量精度，对能量和位置进行了标定。在+/-50 mm区域(视场)内获得了8.6 mm的半高宽空间分辨率，在+/-200 mm区域内获得了0.3 mm标准偏差的线性响应。该相机的设计是为了在剂量限制(约100mGyE)下测量精度在1 mm以内的范围，以减少照射野的安全裕度，并满足所需的特性。(C)2003爱思唯尔B.V.保留所有权利。
A positron camera, consisting of a pair of Anger-type scintillation detectors, has been developed to verify ranges by using positron emitter beams. Each detector head is equipped with a NaI(Tl) crystal (diameter: 600 mm, thickness: 30 mm) for high detection efficiency. To get a low counting rate for this application, the electric circuit was designed for flexibility in measurement and analysis by software. The energy and position were calibrated for high measurement accuracy. A spatial resolution of 8.6 mm in FWHM within a +/- 50 mm region (field of view) and a linear response of a 0.3 mm standard deviation within a +/- 200 mm region were obtained. The camera was designed so as to measure the ranges within an accuracy of 1 mm under a dose limitation (about 100 mGyE) to reduce the safety margin for the irradiation field, and it met the required characteristics. (C) 2003 Elsevier B.V. All rights reserved.