Floyd C E, Jaszczak R J, Harris C C, Coleman R E
Phys Med Biol. 1984 Oct;29(10):1217-30. doi: 10.1088/0031-9155/29/10/005.
Energy and spatial projection distributions were simulated for gamma camera imaging of multiple order Compton scattered photons. SPECT imaging of a line source of radioactivity located in a water filled cylindrical phantom was modelled using Monte Carlo techniques. Photon trajectories were followed from emission to detection including the effects of all physical interactions and the resulting energy spectra and spatial projections were sorted as a function of the number of times the photon underwent Compton scattering before detection. Analysis of energy spectra demonstrates that Compton events up to second order overlap with the non-scattered events and distributions are peaked at lower energies as the scattering order increases. Analysis of spatial projections shows that, with increasing order, Compton events produce tails on the line spread function which progress from roughly exponential to nearly flat distributions. The use of Monte Carlo modelling thus allows a detailed investigation of the spatial and energy distribution of Compton scatter which could not be performed using present experimental techniques.
针对多阶康普顿散射光子的γ相机成像，模拟了能量和空间投影分布。使用蒙特卡罗技术对位于充满水的圆柱形体模中的放射性线源进行单光子发射计算机断层扫描（SPECT）成像建模。追踪光子从发射到探测的轨迹，包括所有物理相互作用的影响，并根据光子在探测前经历康普顿散射的次数对所得能谱和空间投影进行分类。能谱分析表明，直至二阶的康普顿事件与非散射事件重叠，并且随着散射阶数的增加，分布在较低能量处达到峰值。空间投影分析表明，随着阶数增加，康普顿事件在线扩展函数上产生拖尾，其从大致指数分布发展为近乎平坦的分布。因此，蒙特卡罗建模的使用允许对康普顿散射的空间和能量分布进行详细研究，而这是目前的实验技术无法做到的。
