GPU-based fast gamma index calculation.
GPU-based fast gamma index calculation.
复制标题
DOI:
10.1088/0031-9155/56/5/014
复制
发表时间:
2011-03-07
影响因子:
3.5
通讯作者:
Jiang SB
中科院分区:
文献类型:
--
作者:
Gu X;Jia X;Jiang SB
The γ-index dose comparison tool has been widely used to compare dose distributions in cancer radiotherapy. The accurate calculation of γ-index requires an exhaustive search of the closest Euclidean distance in the high-resolution dose-distance space. This is a computational intensive task when dealing with 3D dose distributions. In this work, we combine a geometric method with a radial pre-sorting technique, and implement them on computer graphics processing units (GPUs). The developed GPU-based γ-index computational tool is evaluated on eight pairs of IMRT dose distributions. The γ-index calculations can be finished within a few seconds for all 3D testing cases on one single NVIDIA Tesla C1060 card, achieving 45-75× speedup compared to CPU computations conducted on an Intel Xeon 2.27 GHz processor. We further investigated the effect of various factors on both CPU and GPU computation time. The strategy of pre-sorting voxels based on their dose difference values speeds up the GPU calculation by about 2.7-5.5 times. For n-dimensional dose distributions, γ-index calculation time on CPU is proportional to the summation of γn over all voxels, while that on GPU is affected by γn distributions and is approximately proportional to the γn summation over all voxels. We found increasing the resolution of dose distributions leads to quadratic increase of computation time on CPU, while less-than-quadratic increase on GPU. The values of dose difference (DD) and distance-to-agreement (DTA) criteria also have their impacts on γ-index calculation time.
登录
查看更多内容
影响因子:
3.5
作者:
Men, Chunhua;Gu, Xuejun;Jiang, Steve B.
通讯作者:
Jiang, Steve B.
影响因子:
3.8
作者:
Samant, Sanjiv S.;Xia, Junyi;Owens, John D.
通讯作者:
Owens, John D.
影响因子:
2.1
作者:
Li G;Xie H;Ning H;Citrin D;Capala J;Maass-Moreno R;Guion P;Arora B;Coleman N;Camphausen K;Miller RW
通讯作者:
Miller RW
影响因子:
6.1
作者:
Jacques, Robert;Taylor, Russell;McNutt, Todd
通讯作者:
McNutt, Todd
影响因子:
3.5
作者:
Gu, Xuejun;Choi, Dongju;Jiang, Steve B.
通讯作者:
Jiang, Steve B.