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Related Experiment Video

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Feasibility of Stereo-Infrared Tracking to Monitor Patient Motion During Cardiac SPECT Imaging.

Richard D Beach1, P Hendrik Pretorius, Guido Boening

  • 1University of Massachusetts Medical School, Division of Nuclear Medicine, Worcester, MA 01655 USA.

IEEE Transactions on Nuclear Science
|December 17, 2008
PubMed
Summary

Patient motion during cardiac SPECT imaging is a significant issue. A Polaris motion-tracking system was evaluated for real-time motion monitoring, demonstrating high accuracy and successful artifact reduction in cardiac SPECT scans.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Nuclear Medicine

Background:

  • Patient motion during cardiac Single-Photon Emission Computed Tomography (SPECT) imaging can lead to diagnostic artifacts.
  • Accurate motion monitoring is crucial for improving the diagnostic quality of cardiac SPECT.
  • Existing methods for motion detection may lack the real-time precision required for effective correction.

Purpose of the Study:

  • To investigate the feasibility of using the Polaris motion-tracking system for real-time patient motion monitoring during cardiac SPECT imaging.
  • To assess the accuracy and repeatability of the Polaris system in tracking motion relevant to SPECT acquisitions.
  • To evaluate the effectiveness of motion data from the Polaris system in correcting artifacts in cardiac SPECT images.

Main Methods:

  • Utilized the Polaris motion-tracking system, employing passive infrared reflection for real-time position data (0.35 mm accuracy, 0.2 mm repeatability).
  • Synchronized list-mode SPECT event data with motion-tracking data using a modified LabVIEW virtual instrument.
  • Calibrated SPECT and Polaris coordinates via a transformation matrix aligning reflecting spheres with Tc-99m activity locations.
  • Tracked targets on volunteers and simulated respiratory motion using targets on an elastic band and pneumatic bellows.

Main Results:

  • Achieved excellent correlation (R(2) > 0.998) between target location changes measured by SPECT and the Polaris system.
  • Demonstrated excellent agreement between Polaris recordings of respiratory motion and a pneumatic bellows.
  • Motion correction using Polaris axial motion data for point sources resulted in virtually identical FWHM and FWTM values compared to non-motion-corrected reconstructions.

Conclusions:

  • The Polaris motion-tracking system is feasible for real-time monitoring of patient motion during cardiac SPECT imaging.
  • The system provides accurate and repeatable motion data, correlating well with SPECT measurements and traditional respiratory monitoring.
  • Utilizing Polaris motion data for correction in SPECT acquisitions significantly reduces motion-induced artifacts, improving image quality.