X-ray CT imaging device
First Claim
1. An X-ray CT imaging device for performing X-ray CT imaging of a CT imaging area of a subject, the X-ray CT imaging device comprising:
- an imaging mechanism including an X-ray generator that generates an X-ray, the X-ray generator being accommodated in a housing having an output opening for transmitting the X-ray, a beam formation mechanism that blocks and restricts a radiation range of the X-ray generated by the X-ray generator to form an X-ray cone beam to be directed to the CT imaging area, the beam formation mechanism being positioned forward to the output opening of the housing, and an X-ray detector that detects the X-ray cone beam directed to the subject;
a support that supports the X-ray generator and the X-ray detector in a state where the X-ray generator and the X-ray detector have the subject therebetween;
an imaging mechanism driving section that revolves the support at least about a revolution shaft; and
a controller that controls at least the X-ray generator, the beam formation mechanism, and the imaging mechanism driving section, wherein;
the revolution shaft forms a revolution center,the X-ray generator and the X-ray detector are revolved around the revolution center with respect to the subject,a direction parallel to a direction of an axis of the revolution shaft is a length direction,a direction that is perpendicular to a direction from the X-ray generator to the X-ray detector and also perpendicular to the length direction is a lateral direction,the beam formation mechanism comprises;
a plurality of length direction X-ray blocking plates that block and restrict the radiation range of the X-ray cone beam in the length direction with respect to the CT imaging area;
a plurality of lateral direction X-ray blocking plates that block and restrict the radiation range of the X-ray cone beam in the lateral direction with respect to the CT imaging area; and
blocking plate moving mechanisms that move the plurality of length direction X-ray blocking plates and the plurality of lateral direction X-ray blocking plates,the revolution center is fixed in the CT imaging area,the CT imaging area has a generally triangular shape as seen from the length direction,during the X-ray CT imaging when the support is revolving, the controller controls blocking plates moving mechanisms so that the plurality of lateral direction X-ray blocking plates restrict the radiation range of the X-ray cone beam in the lateral direction so as to make an expansion of the X-ray cone beam in the lateral direction suitable to a width of the CT imaging area as seen in a radiation direction of the X-ray cone beam from the X-ray generator at a revolution position of the support,the plurality of lateral direction X-ray blocking plates restrict the X-ray cone beam so that each of lateral sides of expansion of the X-ray cone beam fits to each of lateral edges of the CT imaging area while a position of each of the lateral edges to the revolution center changes in accordance with the revolution position,a first distance from a reference line to a right edge of the lateral edges and a second distance from the reference line to a left edge of the lateral edges change independently in accordance with the revolution position, andthe reference line passes from the X-ray generator through the revolution center as seen from the length direction.
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Accused Products
Abstract
The present invention has an object of providing an X-ray CT imaging device which can direct X-ray to an area of interest appropriately even when, for example, the height of the area of interest with respect to the X-ray detector, which is revolving, varies with respect to the revolution direction, and thus can reduce the amount of unnecessary exposure to the X-ray and can perform X-ray imaging of the area of interest with certainty. In an X-ray CT imaging device for performing X-ray CT imaging of a CT imaging area of a subject, during the X-ray CT imaging when a revolving arm is revolving, the expansion in a length direction of an X-ray cone beam, which is to be restricted by length direction blocking plates, is adapted to the shape of the CT imaging area in accordance with the revolution position of the revolving arm.
13 Citations
14 Claims
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1. An X-ray CT imaging device for performing X-ray CT imaging of a CT imaging area of a subject, the X-ray CT imaging device comprising:
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an imaging mechanism including an X-ray generator that generates an X-ray, the X-ray generator being accommodated in a housing having an output opening for transmitting the X-ray, a beam formation mechanism that blocks and restricts a radiation range of the X-ray generated by the X-ray generator to form an X-ray cone beam to be directed to the CT imaging area, the beam formation mechanism being positioned forward to the output opening of the housing, and an X-ray detector that detects the X-ray cone beam directed to the subject; a support that supports the X-ray generator and the X-ray detector in a state where the X-ray generator and the X-ray detector have the subject therebetween; an imaging mechanism driving section that revolves the support at least about a revolution shaft; and a controller that controls at least the X-ray generator, the beam formation mechanism, and the imaging mechanism driving section, wherein; the revolution shaft forms a revolution center, the X-ray generator and the X-ray detector are revolved around the revolution center with respect to the subject, a direction parallel to a direction of an axis of the revolution shaft is a length direction, a direction that is perpendicular to a direction from the X-ray generator to the X-ray detector and also perpendicular to the length direction is a lateral direction, the beam formation mechanism comprises; a plurality of length direction X-ray blocking plates that block and restrict the radiation range of the X-ray cone beam in the length direction with respect to the CT imaging area; a plurality of lateral direction X-ray blocking plates that block and restrict the radiation range of the X-ray cone beam in the lateral direction with respect to the CT imaging area; and blocking plate moving mechanisms that move the plurality of length direction X-ray blocking plates and the plurality of lateral direction X-ray blocking plates, the revolution center is fixed in the CT imaging area, the CT imaging area has a generally triangular shape as seen from the length direction, during the X-ray CT imaging when the support is revolving, the controller controls blocking plates moving mechanisms so that the plurality of lateral direction X-ray blocking plates restrict the radiation range of the X-ray cone beam in the lateral direction so as to make an expansion of the X-ray cone beam in the lateral direction suitable to a width of the CT imaging area as seen in a radiation direction of the X-ray cone beam from the X-ray generator at a revolution position of the support, the plurality of lateral direction X-ray blocking plates restrict the X-ray cone beam so that each of lateral sides of expansion of the X-ray cone beam fits to each of lateral edges of the CT imaging area while a position of each of the lateral edges to the revolution center changes in accordance with the revolution position, a first distance from a reference line to a right edge of the lateral edges and a second distance from the reference line to a left edge of the lateral edges change independently in accordance with the revolution position, and the reference line passes from the X-ray generator through the revolution center as seen from the length direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification