X-RAY CT APPARATUS
First Claim
Patent Images
1. An X-ray CT apparatus comprising:
- an electrocardiographic information collecting unit that collects electrocardiographic information;
a data collecting unit that collects projection data obtained by irradiating a subject with X-rays;
an image reconstructing unit that reconstructs an image based on the electrocardiographic information collected by the electrocardiographic information collecting unit and the projection data collected by the data collecting unit;
a concentration calculating unit that determines a concentration of a contrast medium with time within a region of interest; and
a reconstruction condition changing unit that changes reconstruction conditions related to reconstruction of the image based on the concentration determined by the concentration calculating unit.
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Abstract
A CT value of an image within a region of interest is calculated with time. While the calculated CT value does not exceed a predetermined threshold value, a reconstruction mode used when an image is reconstructed from projection data is set to half reconstruction. On the other hand, while the calculated CT value exceeds a predetermined threshold value, the reconstruction mode is set to segment reconstruction.
62 Citations
11 Claims
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1. An X-ray CT apparatus comprising:
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an electrocardiographic information collecting unit that collects electrocardiographic information; a data collecting unit that collects projection data obtained by irradiating a subject with X-rays; an image reconstructing unit that reconstructs an image based on the electrocardiographic information collected by the electrocardiographic information collecting unit and the projection data collected by the data collecting unit; a concentration calculating unit that determines a concentration of a contrast medium with time within a region of interest; and a reconstruction condition changing unit that changes reconstruction conditions related to reconstruction of the image based on the concentration determined by the concentration calculating unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An X-ray CT apparatus comprising:
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an electrocardiographic information collecting unit that collects electrocardiographic information; a data collecting unit that collects projection data obtained by irradiating a subject with X-rays; an image reconstructing unit that reconstructs an image based on the electrocardiographic information collected by the electrocardiographic information collecting unit and the projection data collected by the data collecting unit; a concentration calculating unit that determines a concentration of a contrast medium with time within a region of interest; and an X-ray controlling unit that switches between synchronizing an exposure dose of the X-rays with the electrocardiographic information and asynchronizing the exposure dose of the X-rays with the electrocardiographic information, based on the concentration determined by the concentration calculating unit.
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11. An X-ray CT apparatus comprising:
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an electrocardiographic information collecting unit that collects electrocardiographic information; a data collecting unit that collects projection data obtained by irradiating a subject with X-rays; an image reconstructing unit that reconstructs an image based on the electrocardiographic information collected by the electrocardiographic information collecting unit and the projection data collected by the data collecting unit; a concentration calculating unit that chronologically determines a concentration of a contrast medium with time within a region of interest; a reconstruction condition changing unit that changes reconstruction conditions related to reconstruction of the image based on the concentration determined by the concentration calculating unit; a display unit that displays information indicating changes in the concentration of the contrast medium with time determined by the concentration calculating unit and an interface for receiving an instruction to change imaging conditions related to irradiation of the X-rays; a changing instruction input unit that receives an instruction to change imaging conditions through the interface displayed by the display unit; and an imaging condition changing unit that changes the imaging conditions related to irradiation of the X-rays when the instruction to change the imaging conditions is received by the changing instruction input unit.
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Specification