基于新半圆模型的单平面辛普森法测量右心室容积

Right ventricular volume measurement with single-plane Simpson's method based on a new half-circle model.

作者信息

Cui Wei, Anno Hirofumi, Kondo Takeshi, Guo Yuyin, Sato Takahisa, Sarai Masayoshi, Shinozaki Hitoshi, Kakizawa Satoshi, Sugiura Kouji, Oshima Keita, Katada Kazuhiro, Hishida Hitoshi

机构信息

Department of Cardiology, The Second Hospital of Hebei Medical University, 215 Hepingxi Road, Shijiazhuang, Hebei 050000, People's Republic of China.

出版信息

Int J Cardiol. 2004 Apr;94(2-3):289-92. doi: 10.1016/j.ijcard.2003.06.003.

DOI:10.1016/j.ijcard.2003.06.003

PMID:15093995

Abstract

BACKGROUND

The complexity of right ventricular (RV) shape makes it more difficult for measuring its volume. However, the short-axis view of the right ventricle usually is crescent and might be assumed as half of a circle. This hypothesis can be applied to calculate RV volume by using the single-plane Simpson's method, but the final RV volume should be about half of the original calculated value. The aim of this study was to test the accuracy of RV volume measurement based on this new assumption in human RV casts.

METHODS

Fifteen human RV casts were scanned with multislice helical CT and RV sagittal image that corresponds to right anterior oblique view were reconstructed. Single-plane Simpson's method was used to calculate RV volumes. The calculated RV volume was defined as the original calculated value divided by 2. The true RV cast volume was determined by water displacement.

RESULTS

The true RV volume was 64.23+/-24.51 ml; the calculated volume was 53.18+/-26.22 ml. The calculated RV correlated closely with true volume with a regression equation of RV actual volume=21.04 0.406 x RV calculated volume (r=0.869, P<0.001), but significantly underestimated the actual volume by 11.05+/-13.09 ml (P<0.006).

CONCLUSION

Right ventricular volume could be calculated with single-plane Simpson's method based on the new proposed half-circle model.

摘要

背景

右心室（RV）形状复杂，使其容积测量更为困难。然而，右心室短轴视图通常呈月牙形，可假定为半圆的一半。该假设可应用于通过单平面辛普森法计算右心室容积，但最终右心室容积应为原始计算值的一半左右。本研究旨在验证基于这一新假设在人体右心室铸型中测量右心室容积的准确性。

方法

对15个人体右心室铸型进行多层螺旋CT扫描，并重建与右前斜位相对应的右心室矢状图像。采用单平面辛普森法计算右心室容积。计算得到的右心室容积定义为原始计算值除以2。通过水置换法确定右心室铸型的真实容积。

结果

右心室真实容积为64.23±24.51ml；计算容积为53.18±26.22ml。计算得到的右心室容积与真实容积密切相关，回归方程为右心室实际容积 = 21.04 + 0.406×右心室计算容积（r = 0.869，P < 0.001），但显著低估实际容积11.05±13.09ml（P < 0.006）。