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


CONCLUSIONS
Right ventricular volume could be calculated with single-plane Simpson's method based on the new proposed half-circle model.
Cui
Wei
W
Department of Cardiology, The Second Hospital of Hebei Medical University, 215 Hepingxi Road, Shijiazhuang, Hebei 050000, People's Republic of China. cuiwei21c@hotmail.com
Anno
Hirofumi
H
Kondo
Takeshi
T
Guo
Yuyin
Y
Sato
Takahisa
T
Sarai
Masayoshi
M
Shinozaki
Hitoshi
H
Kakizawa
Satoshi
S
Sugiura
Kouji
K
Oshima
Keita
K
Katada
Kazuhiro
K
Hishida
Hitoshi
H
D001837:Body Weights and Measures; D002306:Cardiac Volume; D006352:Heart Ventricles / Q000033:anatomy & histology; D006801:Humans; D008953:Models, Anatomic; D008955:Models, Cardiovascular; D036542:Tomography, Spiral Computed / Q000379:methods; D016276:Ventricular Function