Spool distortion correction method for an x-ray radiograph diagn

Details Spool distortion correction method for an x-ray radiograph diagn Spool distortion correction method for an x-ray radiograph diagn

1992-04-16

1993-11-16

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378 62, 358111, H05G 164, A61B 600

Patent

active

052630749

ABSTRACT:
In accordance with the distortion correction method for an X-ray radiograph diagnosis device, the distortion center of the X-ray image is determined by use of a plate-shaped object having a circular marker M and a marker center M.sub.0. On the basis of the positions of the sample points M.sub.1 through M.sub.4 upon the circular marker M, the distortion center is inferred. Further, a grid marker pattern is used to determine the magnitudes of pincushion distortion at respective distances from the distortion center. The correction coefficients for correcting the spool distortion at respective distances from the distortion center are determined on the basis of the relationship between the physical and displayed distances from the marker center M.sub.0 to the sample points.

REFERENCES:
patent: 4048507 (1977-09-01), de Gastor
"Implementing an Automatic Control System for Dynamic Radiography", Heimer et al, Medical & Biological Engineering & Computing, vol. 15, No. 2, Mar. 1977, pp. 168-178.

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