Ge Medical Systems Global Technology Company, LLC

Motoki Watanabe

Yasuhiro Imai

In X-ray CT imaging for scanning a subject in the same anatomical region with two kinds of X-rays having different energy distributions, for the purpose of reducing a subject's positional offset between two kinds of tomographic images representing the same slice by a simple control scheme while reducing stress on the subject, a cardiac cycle identifying sectionidentifies a cardiac cycle of a subjectby an electrocardiographor the like, and a scan start time interval setting sectionsets a time interval from the start of a first scan with first X-rays to the start of a second scan with second X-rays to a time approximately the same as the aforementioned cardiac cycle. A scan control sectioncontrols several sections to keep a constant rotation speed of a rotating sectionand start the scans at the aforementioned time interval. In each scan, projection data over a given view angle sufficient for reconstruction processing for a tomographic image are collected at once.

X-ray CT apparatus

This invention provides an X-ray CT apparatus capable of addressing a change in heart beats during a scan and a method of controlling the same. The X-ray CT apparatus includes: a data acquisition device for acquiring projection data of a subject by a helical scan synchronized with a heart beat; an image reconstructing apparatus for reconstructing an image on the basis of the collected projection data; and a controller for controlling the data acquisition device and the image reconstructing apparatus. The controller includes: first control means for changing helical pitch in accordance with a change in the heart beat during the helical scan; and second control means for reconstructing images in a plurality of slice positions at equal intervals on the basis of projection data also including projection data collected during the change in the helical pitch.

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Tokyo, Japan

Motoki Watanabe