title: Evaluation of model-based deformation correction in image-guided liver surgery via tracked intraoperative ultrasound.
abstract: Soft-tissue deformation represents a significant error source in current surgical navigation systems used for open hepatic procedures. While numerous algorithms have been proposed to rectify the tissue deformation that is encountered during open liver surgery, clinical validation of the proposed methods has been limited to surface-based metrics, and subsurface validation has largely been performed via phantom experiments. The proposed method involves the analysis of two deformation-correction algorithms for open hepatic image-guided surgery systems via subsurface targets digitized with tracked intraoperative ultrasound (iUS). Intraoperative surface digitizations were acquired via a laser range scanner and an optically tracked stylus for the purposes of computing the physical-to-image space registration and for use in retrospective deformation-correction algorithms. Upon completion of surface digitization, the organ was interrogated with a tracked iUS transducer where the iUS images and corresponding tracked locations were recorded. Mean closest-point distances between the feature contours delineated in the iUS images and corresponding three-dimensional anatomical model generated from preoperative tomograms were computed to quantify the extent to which the deformation-correction algorithms improved registration accuracy. The results for six patients, including eight anatomical targets, indicate that deformation correction can facilitate reduction in target error of [Formula: see text].
authors.affiliation: Vanderbilt University , Department of Biomedical Engineering, 5824 Stevenson Center, Nashville, Tennessee 37232, United States.
authors.forename: Logan W
authors.initials: LW
authors.lastname: Clements
authors.affiliation: Vanderbilt University , Department of Biomedical Engineering, 5824 Stevenson Center, Nashville, Tennessee 37232, United States.
authors.forename: Jarrod A
authors.initials: JA
authors.lastname: Collins
authors.affiliation: Vanderbilt University , Department of Biomedical Engineering, 5824 Stevenson Center, Nashville, Tennessee 37232, United States.
authors.forename: Jared A
authors.initials: JA
authors.lastname: Weis
authors.affiliation: Memorial Sloan-Kettering Cancer Center , Department of Surgery, 1275 York Avenue, New York, New York 10065, United States.
authors.forename: Amber L
authors.initials: AL
authors.lastname: Simpson
authors.affiliation: Memorial Sloan-Kettering Cancer Center , Department of Surgery, 1275 York Avenue, New York, New York 10065, United States.
authors.forename: Lauryn B
authors.initials: LB
authors.lastname: Adams
authors.affiliation: Memorial Sloan-Kettering Cancer Center , Department of Surgery, 1275 York Avenue, New York, New York 10065, United States.
authors.forename: William R
authors.initials: WR
authors.lastname: Jarnagin
authors.affiliation: Vanderbilt University , Department of Biomedical Engineering, 5824 Stevenson Center, Nashville, Tennessee 37232, United States.
authors.forename: Michael I
authors.initials: MI
authors.lastname: Miga
keywords: biomechanical modeling; clinical evaluation; image-guided surgery; open liver surgery; tracked ultrasound