%0 Journal Article
%T 延长PET轴向视野的马赛克物理设计方案<br>Mosaic designs for extending PET axial fields of view
%A 程李
%A 魏清阳
%A 夏彦
%A 尚鸿
%A 刘亚强
%A 吴朝霞
%A 马天予
%J 清华大学学报（自然科学版）
%D 2015
%R 10.16511/j.cnki.qhdxxb.2015.24.011
%X 该文提出一种马赛克式正电子发射断层成像(PET)探测器设计方案, 通过改变晶体的排布方式, 并基于GATE (Geant4 Application for Emission Tomography)软件模拟, 对3种马赛克PET的设计方案和传统的PET设计方案进行了多方面的对比, 对比的内容包括: 轴向探测效率、体源探测效率以及空间分辨率。并且进一步考虑能量下阈的影响, 比较能量下阈为0 keV、 250 keV和350 keV时各个方案测得的结果的变化。结果表明: 马赛克PET方案在不考虑能量下域时, 轴向探测效率提高24%~50%, 而体源探测效率更是可以提高47%~62%。当能量下阈为 250 keV 时, 方案4的轴向探测效率和体源探测效率可分别提升12%和8%, 于此同时其重建图像空间分辨率较传统方案相比接近。<br>Abstract：There positron emission tomography (PET) mosaic designs were developed from a traditional PET design based on GATE (Geant4 Application for Emission Tomography) simulations using axial sensitivity, volume sensitivity and spatial resolutions with various energy thresholds of 0 keV, 250 keV and 350 keV. The results indicate that without the effect of the energy threshold, the axial sensitivity of the mosaic designs is increased 24%-50%, while the volume sensitivity is increased 47%-62%. With an appropriate energy threshold (250 keV), the axial sensitivity is increased by 12% while the volume sensitivity is increased by 8% to give similar image quality as the traditional design.
%K 正电子发射断层成像(PET)
%K 马赛克排布方案
%K 空间分辨率
%K 能量下阈
%K &lt
%K br&gt
%K positron emission tomography (PET)
%K mosaic designs
%K spatial resolution
%K energy threshold
%U http://jst.tsinghuajournals.com/CN/Y2015/V55/I12/1335