Journal
MEDICAL PHYSICS
Volume 35, Issue 7, Pages 3090-3093Publisher
WILEY
DOI: 10.1118/1.2938521
Keywords
markerless noncontact respiratory tracking; time-of-flight; gating; 4D reconstruction
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In this technical note we present a system that uses time-of-flight (ToF) technology to acquire a real-time multidimensional respiratory signal from a 3D surface reconstruction of the patient's chest and abdomen without the use of markers. Using ToF sensors it is feasible to acquire a 3D model in real time with a single sensor. An advantage of ToF sensors is that their high lateral resolution makes it possible to define multiple regions of interest to compute an anatomy-adaptive multi-dimensional respiratory signal. We evaluated the new approach by comparing a ToF based respiratory signal with the signal acquired by a commercially available external respiratory gating system and achieved an average correlation coefficient of 0.88. (C) 2008 American Association of Physicists in Medicine.
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