Steidley K D, Gamper C, Greener A, Caggiano A
Saint Barnabas Medical Center, Livingston, New Jersey 07039.
Med Phys. 1994 Jan;21(1):61-4. doi: 10.1118/1.597365.
A Clarkson's sector integration scheme has been implemented on a personal computer to calculate mean scatter-air ratio (SAR) and mean tissue-air ratio (TAR) for external photon beams of irregular shape. To find where a given radial line from the point of interest intersects the edge of the radiation field, polygon clipping algorithms have been adapted from the field of image processing. The program has calculation run times of approximately 1 s on an 80387 with a math coprocessor for an integration of 36 sectors. The software was validated by comparison to program IRREG, where for various squares and clinical shapes, the agreement was typically 0.7%. The source code is available from the authors.
已在个人计算机上实施了克拉克森扇形积分方案，以计算不规则形状外照射光子束的平均散射空气比（SAR）和平均组织空气比（TAR）。为了找到从感兴趣点出发的给定射线与辐射野边缘的交点，已采用了来自图像处理领域的多边形裁剪算法。在配备数学协处理器的80387上，该程序对36个扇形进行积分的计算运行时间约为1秒。通过与IRREG程序进行比较对该软件进行了验证，对于各种方形和临床形状，二者的一致性通常为0.7%。源代码可从作者处获取。
