X-ray CT Apparatus and exposure dose calculating method
First Claim
1. An X-ray CT apparatus comprising:
- a gantry including an X-ray source that generates a prespecified amount of X-rays and rotates around a subject and a detector for detecting X-rays passing through said subject at different emission angles;
an operation console for reconstructing an X-ray tomographic image of said subject based on data received from said gantry;
an input device for inputting information on said subject'"'"'s age and information on an X-ray irradiated region in said subject;
a first storing device for storing statistics on the outer periphery lengths of regions in a human body binned with respect to information on age;
a second storing device for storing information on an exposure dose to a phantom having a predetermined diameter measured by irradiating said phantom with a predetermined X-ray dose in a predetermined time period;
a diameter calculating device for calculating a diameter of the X-ray irradiated region in said subject based on said information on the age of said subject and said information on the X-ray irradiated region in said subject input by said input device, and on said statistics on the outer periphery lengths stored in said first storing device;
an exposure dose calculating device for calculating an exposure dose to a phantom having a diameter equivalent to said calculated diameter of the X-ray irradiated region based on said information on the exposure dose stored in said second storing device; and
a display device for displaying said calculated exposure dose.
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Accused Products
Abstract
For the purpose of displaying a more accurate exposure dose value without imposing additional work on an imaging operator, an exposure dose calculating method in an X-ray CT apparatus comprises the steps of: inputting the age and a region to be examined of a subject; calculating the head or chest diameter of the subject based on the age and region to be examined of the subject input at the inputting step, and on statistics on the head or chest circumference of a human body; calculating an exposure dose of a phantom having a diameter equivalent to the calculated diameter of the head or chest, based on prior information on an exposure dose to a phantom having a predetermined diameter when a predetermined X-ray dose is applied to the phantom; and displaying the exposure dose value.
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Citations
9 Claims
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1. An X-ray CT apparatus comprising:
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a gantry including an X-ray source that generates a prespecified amount of X-rays and rotates around a subject and a detector for detecting X-rays passing through said subject at different emission angles;
an operation console for reconstructing an X-ray tomographic image of said subject based on data received from said gantry;
an input device for inputting information on said subject'"'"'s age and information on an X-ray irradiated region in said subject;
a first storing device for storing statistics on the outer periphery lengths of regions in a human body binned with respect to information on age;
a second storing device for storing information on an exposure dose to a phantom having a predetermined diameter measured by irradiating said phantom with a predetermined X-ray dose in a predetermined time period;
a diameter calculating device for calculating a diameter of the X-ray irradiated region in said subject based on said information on the age of said subject and said information on the X-ray irradiated region in said subject input by said input device, and on said statistics on the outer periphery lengths stored in said first storing device;
an exposure dose calculating device for calculating an exposure dose to a phantom having a diameter equivalent to said calculated diameter of the X-ray irradiated region based on said information on the exposure dose stored in said second storing device; and
a display device for displaying said calculated exposure dose. - View Dependent Claims (2, 3, 4)
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5. An exposure dose calculating method for an X-ray CT apparatus comprising a gantry including an X-ray source that generates a prespecified amount of X-rays and rotates around a subject and a detector for detecting X-rays passing through said subject at different emission angles, and an operation console for reconstructing an X-ray tomographic image of said subject based on data received from said gantry, comprising the steps of:
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an inputting step for inputting information on said subject'"'"'s age and information on an X-ray irradiated region in said subject;
a first storing step for storing statistics on the outer periphery lengths of regions in a human body binned with respect to information on age;
a second storing step for storing information on an exposure dose to a phantom having a predetermined diameter measured by irradiating said phantom with a predetermined X-ray dose in a predetermined time period;
a diameter calculating step for calculating a diameter of the X-ray irradiated region in said subject based on said information on the age of said subject and said information on the X-ray irradiated region in said subject input at said inputting step, and on said statistics on the outer periphery lengths stored at said first storing step;
an exposure dose calculating step for calculating an exposure dose to a phantom having a diameter equivalent to said calculated diameter of the X-ray irradiated region based on said information on the exposure dose stored at said second storing step; and
a display step for displaying said calculated exposure dose. - View Dependent Claims (6, 7, 8)
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9. A control program embodied on a computer readable medium for calculating an exposure dose of a patient, said program configured to:
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receive information on a subject'"'"'s age and information on an X-ray irradiated region in the subject;
receive statistics on the outer periphery lengths of regions in a human body;
bin the information of the subject'"'"'s age and the statistics on the outer periphery lengths in a common bin;
receive information on an exposure dose to a phantom having a predetermined diameter measured by irradiating the phantom with a predetermined X-ray dose in a predetermined time period;
calculate a diameter of the X-ray irradiated region in the subject based on the information on the age of the subject and the information on the X-ray irradiated region in the subject input, and on the statistics on the outer periphery lengths;
calculate an exposure dose for a phantom having a diameter equivalent to the calculated diameter of the X-ray irradiated region based on the information on the exposure dose; and
display the calculated exposure dose.
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Specification