Correcting organ motion artifacts in x-ray CT systems based on tracking of motion phase by the spatial overlap correlator. II. Experimental study


  1. Dhanantwari, A.C.
  2. Stergiopoulos, S.
  3. Zamboglou, N.
  4. Karangelis, G.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
This paper presents the experimental part of an investigation on tracking and eliminating organ motion artifacts in x-ray CT cardiac applications with emphasis on imaging coronary calcification. The system methodology consists of a software implementation of the spatial overlap correlator (SSOC) concept in x-ray CT scanners to track the net amplitude and phase of organ motion during the CT data acquisition process. A coherent sinogram synthesis (CSS) method is then used to identify the repeated phases of a periodic organ motion from the information provided by the SSOC process and hence synthesize a new sinogram with no motion effects. Since the SSOC scheme is capable of tracking cardiac motion, it identifies also the projection points associated with minimum amplitude cardiac motion effects. These points are used to identify a 180 degree plus the fan angle sinogram for image reconstruction. This leads to a retrospective gating (RG) scheme that is based on the output of the SSOC process. Performance comparison of the proposed methodology with the retrospective ECG gating using real data sets with phantoms and human patients provides a performance assessment of the merits of the proposed methods. TRUNCATED
Medical Tomography Imaging;Organ Motion Artifacts;Spatial Overlap Correlator;X-Ray Scanners;Cardiac motion artifacts;Imaging coronary calcification;Retrospective gating
Report Number
DCIEM-SL-1999-100B — Scientific Literature
Date of publication
24 May 2001
Number of Pages
Reprinted from
Med. Phys., Vol 28, no 8, 2001, p 1577-1596
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