A bayesian framework for estimating respiratory liver motion from sparse measurements

Authors:
Frank Preiswerk;Patrik Arnold;Beat Fasel;Philippe C. Cattin
Affiliations:
Medical Image Analysis Center, University of Basel, Switzerland;Medical Image Analysis Center, University of Basel, Switzerland;Medical Image Analysis Center, University of Basel, Switzerland;Medical Image Analysis Center, University of Basel, Switzerland
Venue:
MICCAI'11 Proceedings of the Third international conference on Abdominal Imaging: computational and Clinical Applications
Year:
2011

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Abstract

In this paper, we present an approach for modelling and predicting organ motion from partial information. We used 4D-MRI sequences of 12 subjects to build a statistical population model for respiratory motion of the liver. Using a Bayesian reconstruction approach, a pre-operative CT scan and a few known surrogate markers, we are able to accurately predict the position of the entire liver at all times. The surrogates may, for example, come from ultrasound, portal images captured during radiotherapy or from implanted electromagnetic beacons. In leave-one-out experiments, we achieve an average prediction error of 1.2 mm over sequences of 20 min with only three surrogates. Our model is accurate enough for clinically relevant treatment intervals and has the potential to be used for adapting the gating window in tumour therapy or even for tracking a tumour continuously during irradiation.