TEST CHART FOR EVALUATING AND CORRECTING IONIZING RADIOGRAPH, MANUFACTURE THEREOF, AND METHOD OF EVALUATING AND CORRECTING IONIZING RADIOGRAPH

摘要

PROBLEM TO BE SOLVED: To leave a test chart in the vicinity of affected part of an object body to evaluate and correct to specify the position and the size of the affected part from an image, by using the test chart to adjust the ionizing radiation absorptive coefficient and the film thickness on a sheet which does not absorb ionizing radiation or has a low ionizing radiation absorptive coefficient. ;SOLUTION: A test chart 10 uses a transparent adhesive PET film 12, which does not absorb X-ray or has a low X-ray absorptive coefficient, as the sheet for the substrate. A pattern of X-ray absorptive film 14 is printed by an ink, which is made by mixing metal powder into a binder, in a prescribed thickness containing a metal with a high X-ray absorptive coefficient on the processed face. The X-ray absorptive film 14 comprises regions with five gradations of X-ray absorptive coefficients as a whole, which are four divided regions 20A-20D respectively with a ring shape with the center angle of 90° in plan view and a central transparent region 20E. Thereby, when the depth of the observed body tissue is estimated, the distance and the position can be evaluated and corrected from the correct size of the tissue in the horizontal direction and the chart pattern.;COPYRIGHT: (C)1998,JPO