Positional adjustment of resolution in radiation CT scanner

Details Positional adjustment of resolution in radiation CT scanner Positional adjustment of resolution in radiation CT scanner

1993-07-06

1995-01-31

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 8, 378 15, A61B 600

Patent

active

053864468

ABSTRACT:
There provided is a radiation computed tomography (CT) scanner, such as an X-ray CT scaner. A CT image of an object is obtained, resolution of the CT image being affected by a resolution adjustment parameter and the object having an axis. In case of an X-ray CT scaner, the scanner comprises a couch having a longitudinal direction, the axis of the object being aligned along the longitudinal direction, an X-ray source for radiating X-rays toward the object, a detector for detecting the X-rays transmitted through the object, an element for rotating at least the X-ray source around the object, an element for at least relatively moving the X-rays in the longitudinal direction, and an element for controlling the resolution adjustment parameter. Slit members may further be provided for forming the X-rays into a given slice thickness. The parameter includes moving pitches of the couch and rotating element, a rotating speed of the rotating element, an amount of X-rays, and slit widths, according to a longitudinal position of the object.

REFERENCES:
patent: 4174481 (1979-11-01), Liebetruth
patent: 4630202 (1986-12-01), Mori
patent: 4649555 (1987-03-01), Matsubayashi
patent: 5046003 (1991-09-01), Crawford
patent: 5090037 (1992-02-01), Toth et al.
patent: 5103469 (1992-04-01), Tanaka
patent: 5212717 (1993-05-01), Hada

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