X-Ray CT Apparatus
First Claim
1. An x-ray CT apparatus comprising:
- an x-ray data collecting device for collecting x-ray projection data transmitted by a subject positioned between an x-ray generating device and a multi-row x-ray detector, while rotating said x-ray generating device and said multi-row x-ray detector around a rotation center positioned in-between;
an image reconstructing device for performing image reconstruction from the projection data collected from said x-ray data collecting device;
an image display device for displaying a tomogram obtained by image reconstruction; and
a scanning condition setting device for setting various scanning conditions of tomography scanning,wherein said x-ray data collecting device is operable for variable-pitch helical scanning in which x-ray projection data of the subject on a scanning table is collected by moving the scanning table while varying the speed relative to a scanning gantry in a z direction perpendicular to an xy plane which is the rotating plane of the x-ray generating device and the two-dimensional x-ray area detector, and of which starting of the x-ray data collection and starting of the scanning table movement relative to the scanning gantry and/or stopping of the x-ray data collection and stopping of the scanning table movement relative to the scanning gantry are asynchronously executed.
2 Assignments
0 Petitions
Accused Products
Abstract
X-ray CT apparatus includes an x-ray data collecting device for collecting x-ray projection data transmitted by a subject positioned between an x-ray generating device and a multi-row x-ray detector, while rotating said x-ray generating device and said multi-row x-ray detector around a rotation center positioned in-between, an image reconstructing device for performing image reconstruction from the projection data collected from the x-ray data collecting device, an image display device for displaying a tomogram obtained by image reconstruction, and a scanning condition setting device for setting various scanning conditions of tomography scanning. The x-ray data collecting device is operable for variable-pitch helical scanning which x-ray projection data of the subject on a scanning table is collected by moving the scanning table while varying the speed relative to a scanning gantry in a z direction perendicular to an xy plane which is the rotating plane of the x-ray generating device and the two-dimensional x-ray area detector, and of which starting of the x-ray data collection and starting of the scanning table movement relative to the scanning gantry and/or stopping of the x-ray data collection and stopping of the scanning table movement relative to the scanning gantry are asynchronously executed.
45 Citations
20 Claims
-
1. An x-ray CT apparatus comprising:
-
an x-ray data collecting device for collecting x-ray projection data transmitted by a subject positioned between an x-ray generating device and a multi-row x-ray detector, while rotating said x-ray generating device and said multi-row x-ray detector around a rotation center positioned in-between; an image reconstructing device for performing image reconstruction from the projection data collected from said x-ray data collecting device; an image display device for displaying a tomogram obtained by image reconstruction; and a scanning condition setting device for setting various scanning conditions of tomography scanning, wherein said x-ray data collecting device is operable for variable-pitch helical scanning in which x-ray projection data of the subject on a scanning table is collected by moving the scanning table while varying the speed relative to a scanning gantry in a z direction perpendicular to an xy plane which is the rotating plane of the x-ray generating device and the two-dimensional x-ray area detector, and of which starting of the x-ray data collection and starting of the scanning table movement relative to the scanning gantry and/or stopping of the x-ray data collection and stopping of the scanning table movement relative to the scanning gantry are asynchronously executed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method comprising changing a helical pitch during z-direction velocity changes of a moving gantry to obtain substantially uniform image quality in a plurality of reconstructed images.
Specification