Aarnink R G, Giesen R J, de la Rosette J J, Huynen A L, Debruyne F M, Wijkstra H
University Hospital Nijmegen, Department of Urology, The Netherlands.
Physiol Meas. 1995 Aug;16(3):141-50. doi: 10.1088/0967-3334/16/3/001.
Planimetric volumetry is used in clinical practice when accurate volume determination of the prostate is needed. The prostate volume is determined by discretization of the 3D prostate shape. The are of the prostate is calculated in consecutive ultrasonographic cross-sections. This area is multiplied by the distance between the cross-sections and the total volume is determined by summation of all contributions. Besides the quality of the automated outlining, the accuracy of this method depends on this intersection distance and on the angle of the scan plane with the probe. Also, the location of the first cross-section is of influence. This paper describes the influences of these parameters on the accuracy of the volume determination using a simple prostate model. This theoretical influence is compared to clinical volume determinations using automated planimetric volumetry with different step sizes. From our data, it is concluded that a step size of 4 mm for planimetric prostate volume determination is a good compromise between investigation time and accuracy in a clinical setting.
当需要精确测定前列腺体积时，平面测量容积法会应用于临床实践。前列腺体积通过对三维前列腺形状进行离散化来确定。在连续的超声横截面中计算前列腺的面积。该面积乘以横截面之间的距离，通过对所有贡献求和来确定总体积。除了自动勾勒轮廓的质量外，该方法的准确性还取决于此相交距离以及扫描平面与探头的角度。此外，第一个横截面的位置也有影响。本文使用一个简单的前列腺模型描述了这些参数对体积测定准确性的影响。将这种理论影响与使用不同步长的自动平面测量容积法进行的临床体积测定进行了比较。根据我们的数据得出结论，在临床环境中，用于平面测量前列腺体积测定的4毫米步长是调查时间和准确性之间的良好折衷。
