| 摘要 |
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 relative linear motion of the bed plate and the X-ray source is automatically controlled according to the desired imaging region specified by the operator such that the bed plate and the X-ray source is relatively 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 the desired imaging region and the supplementary interpolation data regions, located at ends of the desired imaging region and utilized in carrying out interpolations for deriving data in the desired imaging region; 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.
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