Method for reducing motion artifacts in highly constrained medical images

摘要

A composite image is produced for use in HYPR processing a current image frame. The amount of a priori data used to form the composite is determined by the amount of subject motion. The current composite image may be spatially registered with the current image frame to offset subject motion before being used to form an updated composite image. Subject motion may be analyzed on a frame-by-frame basis, a region-by-region basis or a pixel-by-pixel basis to optimize the SNR of the updated composite image.

主权项

1. A non-transitory computer readable storage medium comprising instructions stored thereon that, when executed by a processor, cause the processor to carry out steps for producing an updated composite image of a subject for use in highly-constrained projection (HYPR) processing an acquired current image frame, the instructions causing the processor to carry out the steps of:
a) dividing the current image frame into a plurality of spatial regions based on a location of the spatial region in the current image frame; b) determining subject motion in each of the spatial regions; and c) producing the updated composite image on a region-by-region basis by combining data in each current image frame region with other acquired image frame data in a manner determined by the subject motion detected in that region; wherein step c) includes multiplying the updated composite image by a decay constant and adding the data in the current image frame to the result of the multiplying step.