title: An Assessment of a Low-Cost Visual Tracking System (VTS) to Detect and Compensate for Patient Motion during SPECT.
abstract: Patient motion is inevitable in SPECT and PET due to the lengthy period of time patients are imaged and patient motion can degrade diagnostic accuracy. The goal of our studies is to perfect a methodology for tracking and correcting patient motion when it occurs. In this paper we report on enhancements to the calibration, camera stability, accuracy of motion tracking, and temporal synchronization of a low-cost visual tracking system (VTS) we are developing. The purpose of the VTS is to track the motion of retro-reflective markers on stretchy bands wrapped about the chest and abdomen of patients. We have improved the accuracy of 3D spatial calibration by using a MATLAB optical camera calibration package with a planar calibration pattern. This allowed us to determine the intrinsic and extrinsic parameters for stereo-imaging with our CCD cameras. Locations in the VTS coordinate system are transformed to the SPECT coordinate system by a VTS/SPECT mapping using a phantom of 7 retro-reflective spheres each filled with a drop of Tc(99m). We switched from pan, tilt and zoom (PTZ) network cameras to fixed network cameras to reduce the amount of camera drift. The improved stability was verified by tracking the positions of fixed retro-reflective markers on a wall. The ability of our VTS to track movement, on average, with sub-millimeter and sub-degree accuracy was established with the 7-sphere phantom for 1 cm vertical and axial steps as well as for an arbitrary rotation and translation. The difference in the time of optical image acquisition as decoded from the image headers relative to synchronization signals sent to the SPECT system was used to establish temporal synchrony between optical and list-mode SPECT acquisition. Two experiments showed better than 100 ms agreement between VTS and SPECT observed motion for three axial translations. We were able to track 3 reflective markers on an anthropomorphic phantom with a precision that allowed us to correct motion such that no loss in visual quality was noted in motion corrected slices relative to motion free slices.
authors.affiliation: Joseph E. McNamara, Karen Johnson, Bing Feng, Andre Lehovich and Michael A. King are with the Department of Radiology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655 (telephone: 508-856-4255, e-mail: Michael.King@umassmed.edu ). Philippe Bruyant is with the Univ. de Bretagne Occidentale, Brest, France. Songxiang Gu and Michael A. Gennert are with the Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA.
authors.forename: Joseph E
authors.initials: JE
authors.lastname: McNamara
authors.forename: Philippe
authors.initials: P
authors.lastname: Bruyant
authors.forename: Karen
authors.initials: K
authors.lastname: Johnson
authors.forename: Bing
authors.initials: B
authors.lastname: Feng
authors.forename: Andre
authors.initials: A
authors.lastname: Lehovich
authors.forename: Songxiang
authors.initials: S
authors.lastname: Gu
authors.forename: Michael A
authors.initials: MA
authors.lastname: Gennert
authors.forename: Michael A
authors.initials: MA
authors.lastname: King