title: Right ventricular volume measurement with single-plane Simpson's method based on a new half-circle model.
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).
  
  
  CONCLUSIONS
  Right ventricular volume could be calculated with single-plane Simpson's method based on the new proposed half-circle model.
authors.affiliation: Department of Cardiology, The Second Hospital of Hebei Medical University, 215 Hepingxi Road, Shijiazhuang, Hebei 050000, People's Republic of China. cuiwei21c@hotmail.com
authors.forename: Wei
authors.initials: W
authors.lastname: Cui
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Anno
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kondo
authors.forename: Yuyin
authors.initials: Y
authors.lastname: Guo
authors.forename: Takahisa
authors.initials: T
authors.lastname: Sato
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Sarai
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Shinozaki
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kakizawa
authors.forename: Kouji
authors.initials: K
authors.lastname: Sugiura
authors.forename: Keita
authors.initials: K
authors.lastname: Oshima
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Katada
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Hishida
mesh_terms: 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