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Proceedings Paper

Motion estimation for nuclear medicine: a probabilistic approach
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Paper Abstract

Accurate, Respiratory Motion Modelling of the abdominal-thoracic organs serves as a pre-requisite for motion correction of Nuclear Medicine (NM) Images. Many respiratory motion models to date build a static correspondence between a parametrized external surrogate signal and internal motion. Mean drifts in respiratory motion, changes in respiratory style and noise conditions of the external surrogate signal motivates a more adaptive approach to capture non-stationary behavior. To this effect we utilize the application of our novel Kalman model with an incorporated expectation maximization step to allow adaptive learning of model parameters with changing respiratory observations. A comparison is made with a popular total least squares (PCA) based approach. It is demonstrated that in the presence of noisy observations the Kalman framework outperforms the static PCA model, however, both methods correct for respiratory motion in the computational anthropomorphic phantom to < 2mm. Motion correction performed on 3 dynamic MRI patient datasets using the Kalman model results in correction of respiratory motion to ≈ 3mm.

Paper Details

Date Published: 21 March 2014
PDF: 6 pages
Proc. SPIE 9034, Medical Imaging 2014: Image Processing, 90342Z (21 March 2014); doi: 10.1117/12.2044141
Show Author Affiliations
Rhodri Smith, Univ. of Surrey (United Kingdom)
Ashrani Aizzuddin Abd. Rahni, Univ. Kebangsaan Malaysia (Malaysia)
Univ. of Surrey (United Kingdom)
John Jones, Univ. of Surrey (United Kingdom)
Fatemeh Tahavori, Univ. of Surrey (United Kingdom)
Kevin Wells, Univ. of Surrey (United Kingdom)

Published in SPIE Proceedings Vol. 9034:
Medical Imaging 2014: Image Processing
Sebastien Ourselin; Martin A. Styner, Editor(s)

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