Staron R B, Ford E
Invest Radiol. 1986 Mar;21(3):272-4. doi: 10.1097/00004424-198603000-00013.
Previous studies have described computed tomographic (CT) measurement of the total volume of large organs and tumors. This study examines sources of error in the CT volumetric measurement of small anatomic structures, and has potential application to the volumetric measurement of small extravisceral tumors. Volume is determined by multiplying observer measurement of area by the CT slice thickness. We focused on the measurement of small cross-sectional areas as a major source of error in volumetric calculations. One observer made ten area measurements on each of 12 structures of various sizes. For areas larger than 8 to 10 cm2, any single measurement was within 2 to 4% of the mean of ten values. For areas smaller than 8 to 10 cm2, measurements varied more with respect to the mean, and rose approximately exponentially as the measured cross-sectional area approached zero.
以往的研究已经描述了通过计算机断层扫描（CT）测量大器官和肿瘤的总体积。本研究探讨了CT对小解剖结构进行体积测量时的误差来源，并可能应用于小的脏外肿瘤的体积测量。体积是通过将观察者测量的面积乘以CT切片厚度来确定的。我们将小横截面积的测量作为体积计算误差的主要来源。一名观察者对12个不同大小的结构中的每一个进行了10次面积测量。对于大于8至10平方厘米的面积，任何单次测量值都在10个值的平均值的2%至4%以内。对于小于8至10平方厘米的面积，测量值相对于平均值的变化更大，并且随着测量的横截面积接近零，测量值大致呈指数上升。
