Matched filter for x-ray hybrid subtraction

Details Matched filter for x-ray hybrid subtraction Matched filter for x-ray hybrid subtraction

1982-11-26

1985-09-17

Smith, Jerry

Boots, shoes, and leggings

378 5, 378 99, 378901, 358111, G06F 1542

Patent

active

045424594

ABSTRACT:
Low and high energy x-ray exposures are made before and after an injected x-ray contrast medium arrives at a blood vessel of interest. In one mode, low and high energy mask images are made and these are subtracted from subsequent low and high energy images, respectively, to yield temporal difference images. The projected intensities of the contrast medium with respect to time constitute matched filter coefficients by which the difference images are mulitplied. The matched filtered images are summed, multiplied by weighting factors and subtracted from each other to yield a final hybrid image. In an alternative mode, successive pairs of low and high energy images are subtracted to yield energy difference images. The difference images are subjected to matched filtering and summed and the results subtracted to produce a final hybrid image. The matched filter coefficients are selected so the dc component in the image signal is equal to zero so everything that is constant in the initial series of images cancels out by subtraction and only contrast medium signal remains.

REFERENCES:
patent: 4029963 (1977-06-01), Alvarez et al.
patent: 4335427 (1982-06-01), Hunt et al.
patent: 4350998 (1982-09-01), Verhoeven
patent: 4355331 (1982-10-01), Georges et al.
patent: 4437161 (1984-03-01), Anderson
patent: 4445226 (1984-04-01), Brody
patent: 4450478 (1984-05-01), Ledley
patent: 4456926 (1984-06-01), Kruger et al.
patent: 4463375 (1984-07-01), Macovski

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