X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1991-10-30
1993-06-29
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 15, 358111, A61B 603
Patent
active
052241351
ABSTRACT:
A method and an apparatus for a helical scan imaging in an X-ray CT, in which the initial set up operation can be achieved easily and accurately. In this X-ray CT apparatus, a linear motion of the bed plate is automatically controlled according to the desired imaging region specified by the operator such that the bed plate is linearly moved through a distance covered by a scanning region appropriate for collecting the data required in order to reconstruct the tomographic images for the desired imaging region. The scanning region includes: half main data regions, each covering a half rotation (180.degree.) part of a main data region for each of slice planes located at ends of the desired imaging region; supplementary data regions, each covering a half rotation (180.degree.) adjacent to each of the half main data regions; an initial acceleration region for accounting an initial acceleration of the bed plate; and a final deceleration region for accounting a final deceleration of the bed plate.
REFERENCES:
patent: 4789929 (1988-12-01), Nishimura et al.
patent: 5046003 (1991-09-01), Crawford
Kabushiki Kaisha Toshiba
Porta David P.
Wong Don
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