title: The correlation between preoperative volumetry and real graft weight: comparison of two volumetry programs.
abstract: OBJECTIVE
  Liver volumetry is a vital component in living donor liver transplantation to determine an adequate graft volume that meets the metabolic demands of the recipient and at the same time ensures donor safety. Most institutions use preoperative contrast-enhanced CT image-based software programs to estimate graft volume. The objective of this study was to evaluate the accuracy of 2 liver volumetry programs (Rapidiavs. Dr. Liver) in preoperative right liver graft estimation compared with real graft weight.
  
  
  METHODS
  Data from 215 consecutive right lobe living donors between October 2013 and August 2015 were retrospectively reviewed. One hundred seven patients were enrolled in Rapidia group and 108 patients were included in the Dr. Liver group. Estimated graft volumes generated by both software programs were compared with real graft weight measured during surgery, and further classified into minimal difference (≤15%) and big difference (>15%). Correlation coefficients and degree of difference were determined. Linear regressions were calculated and results depicted as scatterplots.
  
  
  RESULTS
  Minimal difference was observed in 69.4% of cases from Dr. Liver group and big difference was seen in 44.9% of cases from Rapidia group (P = 0.035). Linear regression analysis showed positive correlation in both groups (P < 0.01). However, the correlation coefficient was better for the Dr. Liver group (R2= 0.719), than for the Rapidia group (R2= 0.688).
  
  
  CONCLUSIONS
  Dr. Liver can accurately predict right liver graft size better and faster than Rapidia, and can facilitate preoperative planning in living donor liver transplantation.
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Nadiar
authors.initials: N
authors.lastname: Mussin
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.; Department of Surgery, The Medical City Hospital, Manila, Philippines.
authors.forename: Marco
authors.initials: M
authors.lastname: Sumo
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Kwang-Woong
authors.initials: KW
authors.lastname: Lee
authors.affiliation: Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: YoungRok
authors.initials: Y
authors.lastname: Choi
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Jin Yong
authors.initials: JY
authors.lastname: Choi
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Sung-Woo
authors.initials: SW
authors.lastname: Ahn
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Kyung Chul
authors.initials: KC
authors.lastname: Yoon
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Hyo-Sin
authors.initials: HS
authors.lastname: Kim
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Suk Kyun
authors.initials: SK
authors.lastname: Hong
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Nam-Joon
authors.initials: NJ
authors.lastname: Yi
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Kyung-Suk
authors.initials: KS
authors.lastname: Suh
keywords: Donor selection; Living donors; Organ size