Bangma C H, Hengeveld E J, Niemer A Q, Schröder F H
Academic Hospital Rotterdam, The Netherlands.
Ultrasound Med Biol. 1995;21(1):11-6. doi: 10.1016/0301-5629(94)00084-0.
Three systemic errors in routine ultrasonic planimetric volume measurements of the prostate were assessed. A computer model using ellipsoids was used to simulate the step section technique and different forms of rotational movements of the prostate during planimetry. The planimetric volume was up to 12% smaller than the exact volume, depending on the degree of rotational movement, the shape, and the length of the ellipsoid. In vivo study of a screening population showed that it is worthwhile to compare caliper length with the number of planimetric steps, as the difference might be an indication of the difference between planimetric and caliper measured volume. In shorter prostates the planimetric volume was smaller than the prolate spheroid volume when compared to longer prostates, as was seen in the computer simulation.
评估了前列腺常规超声平面测量中的三个系统误差。使用一个基于椭球体的计算机模型来模拟平面测量过程中的阶梯截面技术以及前列腺的不同形式旋转运动。根据旋转运动程度、椭球体形状和长度的不同，平面测量体积比精确体积小多达12%。对筛查人群的体内研究表明，将卡尺测量长度与平面测量步数进行比较是有价值的，因为两者差异可能表明平面测量体积与卡尺测量体积之间的差异。正如计算机模拟中所见，与较长的前列腺相比，较短前列腺的平面测量体积小于长椭球体体积。
