Tongdee Trongtum, Keawaen Pasita, Tongdee Ranista
Department of Diagnostic Radiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
J Med Assoc Thai. 2013 Feb;96(2):217-24.
Liver volume of 117 patients who underwent abdominal MDCT for various indications was measured, using CTV. Correlation between CTV and calculated liver volume, acquired from the simple, diameter-base equation and six previously reported formulas, were analyzed. The new formula correlating body weight (BW) or body surface area (BSA) to the measured liver volume from CTV were established using regression analysis.
All existing formulas offer fair to moderate agreement with the measured liver volume from CTV with intra-class correlation (ICC) ranging from 0.280 to 0.576. BW was found to correlate with the measured liver volume from CTV more closely than BSA, then the new formula based on BW was constructed; 21.127 x BW (kg). However our new formula still has only moderate agreement with measured liver volume from CTV (ICC = 0.598). Liver volume calculated from simple, diameter-base equation offer very strong agreement with the measured liver volume from CTV (ICC = 0.829).
All formulas based on BW and BSA offer only fair to moderate agreement with measured liver volume CTV, which can lead to high degree error in liver volume estimation. The present study supports that liver volume can be more accurately estimated on CT scan using simple, diameter-based equation. This simple, reproducible method can be used as a good alternative for liver volume calculation. It is particularly useful in case where there is no Digital Imaging and Communications in Medicine (DICOM) data or dedicated 3D software with volumetric measurement application available.
1）以CT容积测量（CTV）作为金标准，评估泰国人群中现有的各种计算标准肝体积（SLV）的公式以及简单的基于直径的公式。2）开发一种用于计算泰国人群SLV的新公式。
使用CTV测量了117例因各种适应症接受腹部MDCT检查的患者的肝脏体积。分析了CTV与从简单的基于直径的公式和六个先前报道的公式获得的计算肝体积之间的相关性。使用回归分析建立了将体重（BW）或体表面积（BSA）与CTV测量的肝体积相关联的新公式。
所有现有公式与CTV测量的肝体积的一致性为中等至良好，组内相关系数（ICC）范围为0.280至0.576。发现BW与CTV测量的肝体积的相关性比BSA更密切，然后构建了基于BW的新公式：21.127×BW（kg）。然而，我们的新公式与CTV测量的肝体积的一致性仍然仅为中等（ICC = 0.598）。从简单的基于直径的公式计算出的肝体积与CTV测量的肝体积具有非常强的一致性（ICC = 0.829）。
所有基于BW和BSA的公式与CTV测量的肝体积的一致性仅为中等至良好，这可能导致肝体积估计中的高度误差。本研究支持使用简单的基于直径的公式在CT扫描上可以更准确地估计肝体积。这种简单、可重复的方法可以作为肝体积计算的良好替代方法。在没有医学数字成像和通信（DICOM）数据或没有可用的具有容积测量应用的专用3D软件的情况下，它特别有用。
