US 5,499,283 A · Method and apparatus for helical scan imaging in X-ray computed tomography

Abstract

A method and a apparatus for 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, relative motion of a bed plate and an X-ray source is automatically controlled according to a desired imaging region specified by the operator such that the bed plate and the X-ray source are relatively moved through a distance covered by a scanning region appropriate for collecting the data required to reconstruct tomographic images for the desired imaging region. The scanning region includes the desired imaging region and supplementary interpolation data regions, located at the ends of the desired imaging region and utilized in carrying out interpolations for deriving data in the desired imaging region, and initial acceleration region accounting an initial acceleration of the bed plate, and a final deceleration region accounting a final deceleration of the bed plate.

Claims16

Dependent claims

An X-ray computed tomography (CT) apparatus for carrying out a helical scan imaging, comprising:

input means for selecting a desired imaging region;
a bed plate for supporting a body to be examined along a direction of a body axis;
an X-ray source for irradiating X-rays on the body, the X-ray source and the bed plate being rotatable relative to each other at a predetermined angular speed and linearly movable relative to each other along the direction of the body axis;
a detector for detecting the X-rays passing through the body;
data collection means for collecting data from the detected X-rays according to the desired imaging region selected by the input means;
image reconstruction means for reconstructing tomographic images according to the collected data;
and
control means for controlling a relative linear motion of the X-ray source and the bed plate according to the desired imaging region selected by the input means, such that the X-ray source and the bed plate are relatively linearly moved through a distance covered by the desired imaging region in a plurality of scans, each scan by the X-ray source and the bed plate including a readjustment region which overlaps a region covered by a previous scan.

5 more elements

Dependencies are inferred from the claim text.

Method and apparatus for helical scan imaging in X-ray computed tomography

Life of this patent

Method and apparatus for helical scan imaging in X-ray computed tomography

Life of this patent

Abstract

Claims16