title: A Personal Computer Freeware as a Tool for Surgeons to Plan Liver Resections.
abstract: OBJECTIVE
  The increase in liver surgery and the proportion of resections done on the margin to postoperative liver failure make preoperative calculations regarding liver volume important. Earlier studies have shown good correlation between calculations done with ImageJ and specimen weight as well as volume calculations done with more robust systems. The correlation to actual volumes of resected liver tissue has not been investigated, and this was the aim of this study.
  
  
  METHODS
  A total of 30 patients undergoing well-defined liver resections were included in this study. Volumes calculated with ImageJ were compared to volume measurements done after the retrieval of resected liver tissue.
  
  
  CONCLUSIONS
  A strong correlation between calculated and measured liver volume was found with sample concordance correlation coefficient (ρc) = 0.9950. The knowledge on the nature of liver resections sets liver surgeons in a unique position to be able to accurately predict the volumes to be resected and, therefore, also the volume that will remain after surgery. This becomes increasingly important with the evolvement of methods to extend the boundaries of liver surgery. ImageJ is a reliable tool to preoperatively assess liver volume.
authors.affiliation: Department of Surgery and Department of Experimental Medicine, Linköping University, Linköping, Sweden bergthor.bjornsson@liu.se.
authors.forename: B
authors.initials: B
authors.lastname: Björnsson
authors.affiliation: Department of Surgery and Department of Experimental Medicine, Linköping University, Linköping, Sweden.
authors.forename: L
authors.initials: L
authors.lastname: Lundgren
mesh_terms: D000066491:Clinical Decision-Making / Q000379:methods; D006498:Hepatectomy / Q000379:methods*; D006801:Humans; D008099:Liver / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008838:Microcomputers; D009929:Organ Size; D010043:Outcome and Process Assessment, Health Care; D011300:Preoperative Care / Q000379:methods*; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed
keywords: Liver; future liver remnant; liver resection