Feasibility of three-dimensional virtual surgical planning in living liver donors

AbstractPurpose The aim of the study was to determine the accuracy, reproducibility, and improvement in the clinical workflow of a semiautomatic computed tomography (CT) virtual surgical planning program in estimating graft volume using actual graft weight as a standard of reference in living liver donors. Materials and methodsThis retrospective study was approved by our Institutional Review Board and the requirement for informed consent was waived. A total of 105 liver donor candidates who underwent preoperative liver CT were reviewed. Volumes of the whole liver (VT), four hepatic segments, and predicted volumes of the hepatic graft (Vpred) were obtained using a semiautomatic analysis program by radiologists and a conventional manual volumetry program by surgeons. Intraobserver and interobserver agreements of VT and Vpred were assessed using intraclass correlation coefficients (ICCs). Vpred was also compared to the actual graft weight (Wact) and analysis times were recorded. In addition, potential vascular complications were assessed using the surgical planning function of the software.ResultsThe mean processing time of hepatic volumetry, segmentation, and surgical planning using software was significantly shorter than that using manual volumetry (175.9 ± 46.6 vs. 916.6 ± 52.8 s, P < 0.001). VT and Vpred obtained using the semiautomatic analysis program showed significant intra and interobserver agreements (ICC = 0.98–0.99), and Vpred showed strong correlation with Wact (r = 0.83–0.86, P < 0.0001). Furthermore, image review using the liver analysis program detected 80% (4/5) vascular complications.ConclusionLiver volumetry and estimation of graft volume using liver analysis software provided good accuracy and excellent reproducibility in a short time than manual volumetry method and was useful for identifying vascular complications.

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