Feasibility of monitoring patient motion with opposed stereo infrared cameras during supine medical imaging

Richard D. Beach; Joseph E. McNamara; George Terlecki; Michael A. King

doi:10.1117/12.686369

23 October 2006 Feasibility of monitoring patient motion with opposed stereo infrared cameras during supine medical imaging

Richard D. Beach, Joseph E. McNamara, George Terlecki, Michael A. King

Author Affiliations +

Proceedings Volume 6380, Smart Medical and Biomedical Sensor Technology IV; 63800T (2006) https://doi.org/10.1117/12.686369
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

Patient motion during single photon emission computed tomographic (SPECT) acquisition causes inconsistent projection data and reconstruction artifacts which can significantly affect diagnostic accuracy. We have investigated use of the Polaris stereo infrared motion-tracking system to track 6-Degrees-of-Freedom (6-DOF) motion of spherical reflectors (markers) on stretchy bands about the patient's chest and abdomen during cardiac SPECT imaging. The marker position information, obtained by opposed stereo infrared-camera systems, requires processing to correctly record tracked markers, and map Polaris co-ordinate data into the SPECT co-ordinate system. One stereo camera views the markers from the patient's head direction, and the other from the patient's foot direction. The need for opposed cameras is to overcome anatomical and geometrical limitations which sometimes prevent all markers from being seen by a single stereo camera. Both sets of marker data are required to compute rotational and translational 6-DOF motion of the patient which ultimately will be used for SPECT patient-motion corrections. The processing utilizes an algorithm involving least-squares fitting, to each other, of two 3-D point sets using singular value decomposition (SVD) resulting in the rotation matrix and translation of the rigid body centroid. We have previously demonstrated the ability to monitor multiple markers for twelve patients viewing from the foot end, and employed a neural network to separate the periodic respiratory motion component of marker motion from aperiodic body motion. We plan to initiate routine 6-DOF tracking of patient motion during SPECT imaging in the future, and are herein evaluating the feasibility of employing opposed stereo cameras.

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Richard D. Beach, Joseph E. McNamara, George Terlecki, and Michael A. King "Feasibility of monitoring patient motion with opposed stereo infrared cameras during supine medical imaging", Proc. SPIE 6380, Smart Medical and Biomedical Sensor Technology IV, 63800T (23 October 2006); https://doi.org/10.1117/12.686369

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