Department of Medical Physics and Bioengineering, University College London, London WC1E 6BT, UK.
Phys Med Biol. 2011 Jun 21;56(12):3473-86. doi: 10.1088/0031-9155/56/12/002. Epub 2011 May 23.
An ongoing project is being carried out to develop a high purity germanium (HPGe) Compton camera for medical applications. The Compton camera offers many potential advantages over the conventional gamma camera. The camera reported in this paper comprises two pixellated germanium detector planes housed 9.6 cm apart in the same vacuum housing. The camera has 177 pixels, 152 in the scatter detector and 25 in the absorption detector. The pixels are 4 × 4 mm(2) with a thickness of 4 mm in the scatter detector and 10 mm in the absorption detector. Images have been taken for a variety of test objects including point sources, a ring source and a Perspex phantom. The measured angular resolution is 9.4° ± 0.4° for a 662 keV gamma-ray source at 3 cm. Due to the limited number of readout modules a multiple-view technique was used to image the source distributions from different angles and simulate the pixel arrangement in the full camera.
正在进行一个项目，旨在开发一种用于医疗应用的高纯锗（HPGe）康普顿相机。与传统的伽马相机相比，康普顿相机具有许多潜在的优势。本文报道的相机由两个像素化的锗探测器平面组成，它们在同一真空外壳中相隔 9.6 厘米。相机有 177 个像素，散射探测器中有 152 个，吸收探测器中有 25 个。像素尺寸为 4×4mm(2)，散射探测器的厚度为 4mm，吸收探测器的厚度为 10mm。已经对包括点源、环形源和有机玻璃体模在内的各种测试物体拍摄了图像。在 3cm 处，对于 662keV 的伽马射线源，测量的角分辨率为 9.4°±0.4°。由于读取模块数量有限，因此使用多视图技术从不同角度对源分布进行成像，并模拟完整相机中的像素排列。
