Dorr R T, Alberts D S
Department of Medicine, College of Medicine, University of Arizona, Tucson 85724.
Med Oncol Tumor Pharmacother. 1988;5(4):249-51. doi: 10.1007/BF03003192.
A controlled trial of a new circumferential area measuring device, the Tumorimeter, was performed on a set of 30 radiographs of chest nodules ranging in size from 1.5 to 5.0 cm diameter. The Tumorimeter is a hand-held device with a sliding radiolucent loop used to circumferentially measure ellipsoid tumors. It is calibrated in cm2 of surface area. In a crossover comparison with standard Vernier-type calipers, the Tumorimeter was significantly more accurate than bidimensional caliper determinations (less than or equal to 5% surface area error vs a 21-28% overestimate error for calipers). It was also more rapid (an average of 10.5 sec for the Tumorimeter vs 22.3 sec for calipers for each measurement). Both results were statistically significant, P less than 0.0001 by analysis of variance. This trial demonstrates that enhanced speed and accuracy in tumor measurement are possible by using ellipsoid assessments of radiographs. A prospective clinical trial is planned to compare rectangular areas obtained using bidimensional tumor widths, with ellipsoid areas obtained by circumferential tumor measurements using the Tumorimeter.
对一种新型周长测量装置——肿瘤测量仪进行了对照试验，该试验使用了一组30张胸部结节的X光片，这些结节直径大小在1.5至5.0厘米之间。肿瘤测量仪是一种手持装置，带有一个可滑动的射线可透过的环，用于对椭圆形肿瘤进行周长测量。它以平方厘米的表面积进行校准。在与标准游标卡尺的交叉比较中，肿瘤测量仪比二维卡尺测量显著更准确（表面积误差小于或等于5%，而卡尺测量的高估误差为21 - 28%）。它测量速度也更快（肿瘤测量仪每次测量平均用时10.5秒，卡尺为22.3秒）。通过方差分析，这两个结果在统计学上均具有显著意义，P值小于0.0001。该试验表明，通过对X光片进行椭圆形评估，可以提高肿瘤测量的速度和准确性。计划进行一项前瞻性临床试验，以比较使用二维肿瘤宽度获得的矩形面积与使用肿瘤测量仪进行肿瘤周长测量获得的椭圆形面积。
