Method for discriminating x-ray contrast image from non-contrast image and x-ray imaging system including contrast image discriminating function
US5233989A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1991 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Oct 17, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/50
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To discriminate a contrast image from a non-contrast image, an X-ray imaging method is characterized by comprising the steps of: acquiring a plurality of X-ray images of a biological body under medical examination; subtracting at least two sets of the X-ray images with each other acquired at temporally different timings to obtain a subtraction image; subdividing one subtraction image into a plurality of image blocks; calculating an averaged value of image concentration with respect to each of the image blocks, thereby obtaining a plurality of averaged values for the subdivided image blocks; calculating a difference between at least two averaged values of image concentration with respect to the image blocks acquired within substantially same temporal timing period; and, judging whether or not the X-ray image is acquired under such a condition that an X-ray contrast medium appears therein based upon the difference in said two averaged values of image concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.