TRACKING AND CORRECTING FOR ORGAN MOTION ARTIFACTS IN ULTRASOUND TOMOGRAPHY SYSTEMS

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Authors
  1. Dhanantwari, A.C.
  2. Stergiopoulos, S.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Motion artifacts have been identified as a problem in medical tomography systems. This problem however, is well known in other types of real time imaging systems such as RADARs and SONARs. In the cases it has been found that the application of an overlap processing scheme increases the resolution of a phased array imaging system and corrects for motion artifacts as well. Reported results have shown that the problem of correcting motion artifacts in synthetic aperture applications is centered on the estimation of a phase corretion factor. This correction factor is then used to compensate for the temporal phase differences between sequential sensor-array measurements in order to coherently synthesize the spatial information. This paper describes an approach which tracks the organ motion and allows the artifacts to be isolated in ultrasound tomography systems. The spatial overlap correlator processing scheme is used to coherently extend the size of teh 2-D planar array. Adaptive processing of the data from the synthetically extended planar array yields improved array gains which help to counter any effects that cause artifacts.
Report Number
DCIEM-98-P-11 — Paper
Date of publication
20 Jun 1998
Number of Pages
6
DSTKIM No
99-00199
CANDIS No
510024
Format(s):
Hardcopy;Document Image stored on Optical Disk

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