X-ray computerized tomography apparatus

Details X-ray computerized tomography apparatus X-ray computerized tomography apparatus

1995-01-25

1996-10-15

Harvey, Jack B.

X-ray or gamma ray systems or devices

Source

Electron tube

378113, 378145, H01J 3500

Patent

active

055662200

ABSTRACT:
In an X-ray computerized tomography apparatus, a water phantom is interposed between an X-ray tube unit and an X-ray detector in place of a subject under examination and a plurality of pieces of data detected by a plurality of X-ray detector elements are previously measured as a pieces of compensation data while shifting the X-focal point to different positions. Compensation data corresponding to the actual position of the X-ray focal point, which shifts according to the thermal state of the X-ray tube unit, is selected to correct detect data obtained for a subject under examination, permitting optimum compensation of variations in sensitivity among the X-ray detector elements for any position of the X-ray focal point, thereby preventing a ring-like artifact from being produced on a tomography image.

REFERENCES:
patent: 4713833 (1987-12-01), Turner et al.
patent: 4730353 (1988-03-01), Ono et al.
patent: 4803711 (1989-02-01), Tsujii et al.
patent: 4827494 (1989-05-01), Koenigsberg
patent: 5060254 (1991-10-01), de Fraguier et al.
patent: 5065420 (1991-11-01), Levene
patent: 5265142 (1993-11-01), Hsieh

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