Badiozamani K R, Wallner K, Cavanagh W, Blasko J
Department of Radiation Oncology, University of Washington, Seattle, USA.
Int J Radiat Oncol Biol Phys. 1999 Jan 15;43(2):375-8. doi: 10.1016/s0360-3016(98)00418-0.
To compare the prostate volumes defined by transrectal ultrasound (TRUS) versus computed tomographic (CT) scans used for brachytherapy planning.
Ten unselected patients underwent evaluation for prostate brachytherapy with TRUS and CT imaging. Axial prostate contours were obtained at 5-mm intervals in both studies. The CT images were photographed, scanned into a commercial software program, and reprinted from a laser printer at 600 dots per inch to provide individual images that were interpreted independently by the three physician authors (BK, KW, and JB). An effort was made to exclude pelvic floor muscles from the defined prostate contour. Volumes were calculated in cubic centimeters. The prostate volume and maximum dimension in each plane were compared for each imaging modality.
The CT-based prostate volumes ranged from 31.1 cc to 48.1 cc. The TRUS-based volumes ranged from 26.6 cc to 46.4 cc. There was close agreement between imaging modalities (r = 0.9). The anterior-posterior, lateral, and craniocaudal prostatic dimensions were similar between modalities. To test for consistency between observers, the CT volumes were drawn independently by KB, KW, and JB. The prostatic measurements were consistent in all dimensions between observers.
CT scan volumes and measurements correlate well with those obtained by TRUS, and are appropriate for pre- or postimplant dosimetry.
比较经直肠超声（TRUS）与用于近距离放射治疗计划的计算机断层扫描（CT）所定义的前列腺体积。
10例未经挑选的患者接受了TRUS和CT成像的前列腺近距离放射治疗评估。两项研究均以5毫米间隔获取轴向前列腺轮廓。拍摄CT图像，扫描到商业软件程序中，并以每英寸600点的分辨率从激光打印机打印出来，以提供由三位医师作者（BK、KW和JB）独立解读的个体图像。努力将盆底肌肉排除在定义的前列腺轮廓之外。体积以立方厘米计算。比较了每种成像方式下前列腺的体积和每个平面的最大尺寸。
基于CT的前列腺体积范围为31.1立方厘米至48.1立方厘米。基于TRUS的体积范围为26.6立方厘米至46.4立方厘米。成像方式之间有密切的一致性（r = 0.9）。不同成像方式下前列腺的前后径、左右径和头脚径相似。为测试观察者之间的一致性，KB、KW和JB分别独立绘制CT体积。观察者之间所有维度的前列腺测量结果一致。
CT扫描的体积和测量结果与TRUS获得的结果相关性良好，适用于植入前或植入后的剂量测定。
