Determination of direct x-ray exposure regions in digital medica

Details Determination of direct x-ray exposure regions in digital medica Determination of direct x-ray exposure regions in digital medica

1996-03-21

1997-02-25

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Absorption

G01N 2304

Patent

active

056065876

ABSTRACT:
A method of determining direct x-ray exposure regions in digital medical imaging comprising the steps of: providing a digital medical image including a matrix of lines and columns of pixels; evaluating significant transitions in line and column profiles to determine appropriate line and column thresholds; evaluating all pixels which exceed the line/column threshold for structure by computing the variation within a moving window using a range statistic; accumulating within a histogram pixels which exceed a threshold for that particular line or column and which contain variation indicative of direct x-ray exposure; and analyzing the background histogram to determine the beginning intensity or code value (left point) of the background region.

REFERENCES:
patent: 4731863 (1988-03-01), Sezan et al.
patent: 5046118 (1991-09-01), Ajewole et al.
patent: 5164993 (1992-11-01), Capozzi et al.
patent: 5268967 (1993-12-01), Jang et al.

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