Determination of pelvic orientation from ultrasound images using patch-SSMs and a hierarchical speed of sound compensation strategy

Authors:
Steffen Schumann;Marc Puls;Timo Ecker;Tobias Schwaegli;Jan Stifter;Klaus-A. Siebenrock;Guoyan Zheng
Affiliations:
Inselspital, Orthopaedic Department, University of Bern, Bern, Switzerland;Inselspital, Orthopaedic Department, University of Bern, Bern, Switzerland;Inselspital, Orthopaedic Department, University of Bern, Bern, Switzerland;Smith & Nephew Orthopaedics AG, Aarau, Switzerland;Smith & Nephew Orthopaedics AG, Aarau, Switzerland;Inselspital, Orthopaedic Department, University of Bern, Bern, Switzerland;Inselspital, Orthopaedic Department, University of Bern, Bern, Switzerland
Venue:
IPCAI'10 Proceedings of the First international conference on Information processing in computer-assisted interventions
Year:
2010

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Abstract

In the field of computer assisted orthopedic surgery (CAOS) the anterior pelvic plane (APP) is a common concept to determine the pelvic orientation by digitizing distinct pelvic landmarks. As percutaneous palpation is - especially for obese patients - known to be error-prone, B-mode ultrasound (US) imaging could provide an alternative means. Several concepts of using ultrasound imaging to determine the APP landmarks have been introduced. In this paper we present a novel technique, which uses local patch statistical shape models (SSMs) and a hierarchical speed of sound compensation strategy for an accurate determination of the APP. These patches are independently matched and instantiated with respect to associated point clouds derived from the acquired ultrasound images. Potential inaccuracies due to the assumption of a constant speed of sound are compensated by an extended reconstruction scheme. We validated our method with in-vitro studies using a plastic bone covered with a soft-tissue simulation phantom and with a preliminary cadaver trial