Method and apparatus for X-ray image subtraction

Details Method and apparatus for X-ray image subtraction Method and apparatus for X-ray image subtraction

1982-04-26

1984-11-13

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

378 99, H04N 532

Patent

active

044829183

ABSTRACT:
Apparatus and methods are provided for performing temporal and hybrid subtraction of X-ray images. In one mode, using three memories, a pair of low and high energy X-ray exposures are made before an X-ray contrast medium arrives in a blood vessel to provide mask images. After contrast arrival additional high and low energy exposures are made and the low energy mask is subtracted from the low energy post-contrast images and the high energy mask is subtracted from the high energy post-contrast images and the resulting sequence of low and high energy temporal difference images are stored. The low energy temporal difference images are displayed. If motion artifacts are perceived, hybrid subtraction of low and high energy temporal difference images is undertaken to produce an image data set in which motion artifacts are removed. In an alternate mode, which uses four memories, low and high energy pre-contrast mask images are stored in one pair of memories. Low and high energy live post-contrast images are subtracted from the stored images and the resulting low and high energy temporal difference images are stored in the other pair of memories. These are subtracted to produce hybrid images.

REFERENCES:
patent: 3974386 (1976-08-01), Mistretta
patent: 4204225 (1980-05-01), Mistretta
patent: 4204226 (1980-05-01), Mistretta
patent: 4335307 (1982-06-01), De Vries et al.
patent: 4355331 (1982-10-01), Georges et al.

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