Ishida T, Katsuragawa S, Nakamura K, MacMahon H, Doi K
Kurt Rossmann Laboratories for Radiologic Image Research, Department of Radiology, The University of Chicago, Illinois 60637, USA.
Med Phys. 1999 Jul;26(7):1320-9. doi: 10.1118/1.598627.
A temporal subtraction technique has been developed to assist radiologists in the detection of interval changes on chest radiographs. Although the overall performance of the current temporal subtraction technique is relatively good, severe misregistration errors, mainly due to AP inclination and/or rotation, are observed in some cases. In order to reduce these errors, we attempted to improve the subtraction scheme by applying an iterative image warping technique. In cases obtained with the new temporal subtraction technique 177 (97.8%) of 181 showed adequate, good, or excellent quality. We also found that 156 (86.2%) of cases obtained with the new scheme showed improvements in the quality of the subtraction images compared with the previous scheme. The results indicate that the performance of the temporal subtraction technique was greatly improved by use of the iterative image warping technique.
已开发出一种时间减法技术，以协助放射科医生检测胸部X光片上的间隔变化。尽管当前时间减法技术的整体性能相对较好，但在某些情况下仍观察到严重的配准误差，主要是由于前后位倾斜和/或旋转所致。为了减少这些误差，我们尝试通过应用迭代图像变形技术来改进减法方案。在采用新的时间减法技术获得的病例中，181例中有177例（97.8%）显示质量足够、良好或优秀。我们还发现，与先前方案相比，采用新方案获得的病例中有156例（86.2%）的减法图像质量有所改善。结果表明，通过使用迭代图像变形技术，时间减法技术的性能得到了极大提高。
