Sharma S C, Williamson J F, Cytacki E
Int J Radiat Oncol Biol Phys. 1982 Oct;8(10):1803-5. doi: 10.1016/0360-3016(82)90306-6.
We have evaluated the performance of stereo and orthogonal computerized three-dimensional implant reconstruction algorithms. Sets of orthogonal and stereo radiographs of a simulated interstitial seed implant were taken. Computer reconstructed coordinates of each source were compared with their measured positions in order to assess the geometric accuracy of the two methods. We find that the effect of random measurement errors on reconstructed coordinates from stereo films is 3-5 times that of the orthogonal method. Although relative individual seed positions may be in error by as much as 1 cm, these errors do not significantly change the shape or area of isodose curves surrounding the implant periphery.
我们已经评估了立体和正交计算机三维植入物重建算法的性能。对模拟组织间籽源植入物拍摄了正交和立体X线片。将每个源的计算机重建坐标与其测量位置进行比较，以评估这两种方法的几何精度。我们发现，随机测量误差对立体胶片重建坐标的影响是正交方法的3至5倍。尽管单个籽源的相对位置误差可能高达1厘米，但这些误差不会显著改变植入物周边等剂量曲线的形状或面积。
