X-ray CT apparatus
A technology of equipment and line data, used in X-ray equipment, medical science, diagnosis, etc., can solve problems such as narrowing of the area, different image quality, and inability to scan
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Embodiment 1
[0134] Embodiment 1: Move the imaging platform 10 or the carriage 12 (hereinafter collectively referred to as the imaging platform 10) in the z direction to collect X-ray data during the acceleration, uniform operation, and deceleration of the imaging platform 10, and after the X-ray data collection is terminated The operation of the imaging platform 10 is ended.
Embodiment 2
[0135] Embodiment 2: Before moving the imaging platform 10 or the carriage 12 (hereinafter collectively referred to as the imaging platform 10) in the z-direction, the imaging platform 10 is kept upright; when X-ray data is collected by conventional scanning (axial scanning), or at fan angle +180 degrees or 360 degrees, or after performing multiple revolutions or film scanning, move the imaging platform 10 to collect X-ray data during the acceleration, uniform operation, and deceleration of the imaging platform 10; after stopping the operation of the imaging platform 10, when imaging The platform 10 is at the standing time, and performs traditional scanning (axial scanning) or cine scanning to collect X-ray data at the fan angle +180 degrees or 360 degrees, or multiple revolutions; after the X-ray data collection is completed, the X-ray data is also terminated. Radiation.
[0136] Example 1
[0137] FIG. 20 shows a flow chart of the entire operation flow of the first embodiment.
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Embodiment 3
[0367] In Embodiment 1 and Embodiment 2, the z coordinate at each time point is predicted as shown in the graph of FIG. 21 or 23. Or use an encoder or the like arranged on the imaging platform 10 or the bracket 12 to measure the z-direction coordinate position, and extract the X-ray projection data of FIG. 10 when the three-dimensional image is reconstructed for measuring each angle of view or a plurality of fixed intervals. In the case of the z-direction coordinate position of the viewing angle, accurate three-dimensional back projection can be realized in consideration of the z-direction coordinate positions of each viewing angle or multiple viewing angles at fixed intervals calculated based on these predicted or measured viewing angles.
[0368] This makes it possible to obtain a tomogram with high picture quality, uniform picture quality in the z-direction, and relatively free of artifacts.
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