X-ray dose computations in heterogeneous media using 3-dimensional FFT convolution

X-ray dose computations in heterogeneous media using 3-dimensional FFT convolution
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使用 3 维 FFT 卷积计算异质介质中的 X 射线剂量

DOI:
10.1088/0031-9155/35/3/005
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发表时间:
1990
影响因子:
3.5
通讯作者:
A. Boyer
A. Boyer
中科院分区:
工程技术2区
文献类型:
--
作者:
Yunping Zhu;A. Boyer

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利用快速傅里叶变换的卷积,对标称6 MV和18 MV x射线束和钴-60光子束的剂量分布进行了三维非均匀模态建模。在65536个计算点(即64*64*16矩阵)计算5个光谱组分的剂量。初级通量通过非均匀介质的射线追踪计算。剂量是通过与初始通量的卷积得到的。以电子为媒介的初剂量分量与以散射x射线为媒介的散射分量分别计算。在数字设备公司VAXstation 3500上,每个频谱分量的计算时间约为3分钟。FFT卷积计算与测量结果的比较表明,FFT卷积算法可以预测x射线束通过异质体的大部分特性。
Dose distributions of nominal 6 and 18 MV X-ray beams and cobalt-60 photon beams were modelled in three dimensions in heterogeneous phantoms using convolutions that employ the fast Fourier transform. Doses were computed at 65536 calculation points (i.e. a 64*64*16 matrix) for five spectral components. Primary fluence was calculated by ray-tracing through the inhomogeneous medium. Dose was obtained by convolution with the primary fluence. The primary dose component, mediated by electrons, was calculated separately from the scatter component, mediated by scattered X-rays. The calculation time was approximately 3 minutes per spectral component on a Digital Equipment Corporation VAXstation 3500. Comparisons of FFT convolution calculations with measurements showed that an FFT convolution algorithm can predict most of the characteristics of an X-ray beam passing through a heterogeneous phantom.
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