Device for and method of subtraction imaging with reduction of m

Details Device for and method of subtraction imaging with reduction of m Device for and method of subtraction imaging with reduction of m

1987-11-30

1989-09-26

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 44, 358111, 36441323, G06K 900, G06K 932

Patent

active

048706922

ABSTRACT:
Images formed by digital subtraction angiography are improved by subtracting a locally deformed image from another image. A subtraction image is obtained which is substantially free from motion artefacts and which contains only the information of a moving contrast medium. To achieve this, a shift vector is determined for various pixels and a reliability criterion is calculated for each direction component of said shift vector.

REFERENCES:
patent: 4558462 (1985-12-01), Horiba et al.
patent: 4626991 (1986-12-01), Crawford et al.
patent: 4635293 (1987-01-01), Watanabe
patent: 4636953 (1987-01-01), Kageyama
patent: 4641352 (1987-02-01), Fenster et al.
patent: 4644582 (1987-02-01), Morishita et al.

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