Medical X-ray imaging apparatus

Details Medical X-ray imaging apparatus Medical X-ray imaging apparatus

1996-02-08

1997-02-18

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Absorption

378901, G01N 2304

Patent

active

056047819

ABSTRACT:
The present invention provides an X-ray tomographic imaging apparatus, wherein image degrading components caused by a CCD sensor (3c) or the like are reduced so as to obtain high-quality X-ray images. After tomographic imaging, dark current noise is eliminated by subtracting dark current correction data from a specific line of data among image data stored in an image memory. Next, sensitivity correction coefficients are prepared on the basis of data obtained when an X-ray beam having nearly uniform intensity distribution enters an X-ray imaging device 3. The image data obtained after dark current correction is then multiplied by the sensitivity correction coefficients. As a result, noise due to sensitivity variations or the like can be eliminated.

REFERENCES:
patent: 5452338 (1995-09-01), Granfors et al.
patent: 5541974 (1996-07-01), Sklebitz

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