US 7,606,345 B2 · X-ray CT apparatus

Abstract

An X-ray CT apparatus enables decreasing the degradation of image quality and reducing futile exposure to X-ray in a helical shuttle scan. The X-ray CT apparatus comprises: a gantry rotating device having an X-ray generator for generating the X-ray and an X-ray detector for detecting the generated X-ray and transmitted through a subject; a gantry controller for performing the helical shuttle scan by reciprocally moving the gantry rotating device and the cradle; a scan condition setting device for setting the scan condition of the helical shuttle scan in a predetermined range in the direction of body axis of the subject; an X-ray projection data acquisition device for acquiring the X-ray projection data; a scan controller for controlling the scan as specified in the scan condition; and a image reconstruction device for performing the image reconstruction processing based on the X-ray projection data.

Claims20

Dependent claims

An X-ray CT apparatus, comprising:

a gantry rotating device comprising an X-ray generator configured to generate an X-ray, and an X-ray detector configured to detect the X-ray generated by said X-ray generator and transmitted through a subject;
a cradle configured to carry the subject thereon;
a gantry controller configured to perform a helical shuttle scan for relatively reciprocally moving said gantry rotating device and said cradle;
a scan condition setting device configured to set a scan condition of the helical shuttle scan in a predetermined range in a direction of body axis of the subject;
an X-ray projection data acquisition device configured to acquire X-ray projection data obtained by the helical shuttle scan;
a scan controller configured to control the helical shuttle scan as set in accordance with the scan condition;
and
an image reconstruction device configured to perform an image reconstruction processing based on the X-ray projection data acquired by said X-ray projection data acquisition device.

5 more elements

An X-ray CT imaging method comprising:

using a helical shuttle scan, moving a gantry rotating device and a cradle a apparatus in a relatively reciprocal manner, the gantry rotating device includes an X-ray generator configured to generate an X-ray and an X-ray detector configured to detect the X-ray generated by the X-ray generator and transmitted through a subject and the cradle apparatus having the subject thereon;
setting a scan condition of the helical shuttle scan in a predetermined range in a direction of body axis of the subject;
acquiring X-ray projection data obtained by the helical shuttle scan with controlling so as to perform the helical shuttle scan as set in accordance with the scan condition;
and
performing an image reconstruction processing based on the acquired X-ray projection data.

2 more elements

Dependencies are inferred from the claim text.

X-ray CT apparatus

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X-ray CT apparatus

Life of this patent

Abstract

Claims20