一种通过计算机断层扫描估算肾体积的简单方法。
A simple method to estimate renal volume from computed tomography.
作者信息
Breau Rodney H, Clark Edward, Bruner Bryan, Cervini Patrick, Atwell Thomas, Knoll Greg, Leibovich Bradley C
机构信息
Ottawa Hospital Research Institute, Ottawa, ON; ; Division of Urology, University of Ottawa, Ottawa ON;
出版信息
Can Urol Assoc J. 2013 May-Jun;7(5-6):189-92. doi: 10.5489/cuaj.1338.
INTRODUCTION
Renal parenchymal volume can be used clinically to estimate differential renal function. Unfortunately, conventional methods to determine renal volume from computed tomography (CT) are time-consuming or difficult due to software limitations. We evaluated the accuracy of simple renal measurements to estimate renal volume as compared with estimates made using specialized CT volumetric software.
METHODS
We reviewed 28 patients with contrast-enhanced abdominal CT. Using a standardized technique, one urologist and one urology resident independently measured renal length, lateral diameter and anterior-posterior diameter. Using the ellipsoid method, the products of the linear measurements were compared to 3D volume measurements made by a radiologist using specialized volumetric software.
RESULTS
LINEAR KIDNEY MEASUREMENTS WERE HIGHLY CONSISTENT BETWEEN THE UROLOGIST AND THE UROLOGY RESIDENT (INTRACLASS CORRELATION COEFFICIENTS: 0.97 for length, 0.96 for lateral diameter, and 0.90 for anterior-posterior diameter). Average renal volume was 170 (SD: 36) cm(3) using the ellipsoid method compared with 186 (SD 37) cm(3) using volumetric software, for a mean absolute bias of -15.2 (SD 15.0) cm(3) and a relative volume bias of -8.2% (p < 0.001). Thirty-one of 56 (55.3%) estimated volumes were within 10% of the 3D measured volume and 54 of 56 (96.4%) were within 30%.
CONCLUSION
Renal volume can be easily approximated from contrast-enhanced CT scans using the ellipsoid method. These findings may obviate the need for 3D volumetric software analysis in certain cases. Prospective validation is warranted.
引言
肾实质体积可在临床上用于评估肾功能差异。遗憾的是，由于软件限制，利用计算机断层扫描（CT）确定肾脏体积的传统方法耗时或存在困难。我们评估了简单肾脏测量估计肾脏体积的准确性，并与使用专门的CT容积软件得出的估计值进行比较。
方法
我们回顾了28例接受腹部增强CT检查的患者。采用标准化技术，一名泌尿外科医生和一名泌尿外科住院医师独立测量肾脏的长度、横径和前后径。使用椭球体法，将线性测量的乘积与放射科医生使用专门容积软件进行的三维体积测量结果进行比较。
结果
泌尿外科医生和泌尿外科住院医师之间的线性肾脏测量结果高度一致（组内相关系数：长度为0.97，横径为0.96，前后径为0.90）。使用椭球体法得出的平均肾脏体积为170（标准差：36）cm³，而使用容积软件得出的平均肾脏体积为186（标准差37）cm³，平均绝对偏差为-15.2（标准差15.0）cm³，相对体积偏差为-8.2%（p<0.001）。56个估计体积中有31个（55.3%）在三维测量体积的10%以内，56个中有54个（96.4%）在30%以内。
结论
使用椭球体法可轻松从腹部增强CT扫描中近似得出肾脏体积。这些发现可能使某些情况下无需进行三维容积软件分析。有必要进行前瞻性验证。
Zotero 插件