Alignment procedure for radiation images undergoing subtraction

Details Alignment procedure for radiation images undergoing subtraction Alignment procedure for radiation images undergoing subtraction

1983-03-21

1987-12-01

Smith, Jerry

Boots, shoes, and leggings

2504911, 358111, 378162, H04N 532

Patent

active

047108754

ABSTRACT:
Markers for providing reference points or lines are recorded together with radiation images on stimulable phosphor sheets in a position fixed with respect to the radiation images. The stimulable phosphor sheets are scanned with stimulating rays, and the spatial coordinates of reference points or lines are detected from digital data of the images detected from light emitted from the stimulable phosphor sheets. Rotation and shift among the radiation images are calculated based on the reference points or lines. One of the radiation images is rotated on the digital data when positional deviation exists and moved on the digital data when positional deviation exists. Subtraction of the image data is then conducted among the corresponding picture elements of the radiation images to extract an image of a specific portion of the radiation images.

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European Search Report No. 89,665, published Sep. 1983, based on application EP 83102787.
Kruger, R. A. et al., "A Digital Video Image Processor for Real-Time X-Ray Subtraction Imaging", Optical Engineering, vol. 17, No. 6, Nov./Dec. 1978, 652-7.

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