Radiation diagnostic apparatus, radiation detector and output determination method

1 . A radiation diagnostic apparatus, comprising:

a plurality of radiation detection elements that are arranged in a two-dimensional direction; and

processing circuitry configured to determine, based on a first output of a first detection element included in the radiation detection elements, and a second output relating to a second detection element of at least one second detection element, an output corresponding to a reconstruction position of the first detection element, wherein the determined output is an output from the first detection element that occurs when the radiation incident on the reconstruction position of the first detection element is entirely converted into charge at the reconstruction position,

wherein the processing circuitry is further configured to determine the output corresponding to the reconstruction position by using a first weight determined according to a first angle from a reference line to the first detection element in a direction in a plane including the first detection element and the second detection element out of the two-dimensional direction, and a second weight determined according to a second angle from the reference line to the second detection element, wherein a second weight is provided for each detection element of the at least one second detection element, and

wherein the first weight and the second weight are set based on a material that converts the radiation into any one of electron and visible light in the first detection element and the second detection element, a thickness of the material, and a first angle at which the radiation enters the first detection element, and

as the first angle increases, the first weight decreases and the second weight increases.

2 . The radiation diagnostic apparatus according to claim 1 , wherein the processing circuitry is further configured to determine the output corresponding to the reconstruction position by adding up a first multiplication value obtained by multiplying the first output by the first weight and a second multiplication value obtained by multiplying the second output by the second weight.

3 . The radiation diagnostic apparatus according to claim 1 , wherein

the radiation diagnostic apparatus is an X-ray computed tomography apparatus,

the two-dimensional direction is a cone angle direction and a fan angle direction,

the radiation is an X-ray,

the first detection element and the second detection element are arranged along the cone angle direction, and

the processing circuitry is further configured to determine the output corresponding to the reconstruction position by using the first weight determined according to a first cone angle from the reference line to the first detection element, and the second weight determined according to a second cone angle from the reference line to the second detection element.

4 . The radiation diagnostic apparatus according to claim 3 , wherein the first output, the second output, and the output corresponding to the reconstruction position are a number of counts obtained by counting photons in the X-ray.

5 . The radiation diagnostic apparatus according to claim 4 , wherein

the first output is a plurality of first counts according to a plurality of energy bins in the X-ray,

the second output is a plurality of second counts according to the energy bins, and

the processing circuitry is further configured to determine the number of counts as the output corresponding to the reconstruction position of each of the energy bins based on the first weight, the second weight, the first count, and the second count for each of the energy bins.

6 . The radiation diagnostic apparatus according to claim 5 , wherein

the first weight in each of the energy bins decreases as an energy in a plurality of representative energies representing the energy bins becomes higher, and

the second weight in each of the energy bins increases as the energy of the representative energies becomes higher.

7 . The radiation diagnostic apparatus according to claim 1 , wherein when a gap is present between the first detection element and the second detection element, the first weight is set to be small compared to when the gap is not present, and the second weight is set to be large compared to when the gap is not present.

8 . The radiation diagnostic apparatus according to claim 1 , wherein the processing circuitry is further configured to perform reconstruction processing with respect to projection data based on the output corresponding to the reconstruction position, to generate a reconstruction image.

9 . The radiation diagnostic apparatus according to claim 1 , wherein the reconstruction position is a position that is used by the processing circuitry to perform reconstruction based on the output, and that indicates a representative point of the first detection element.

10 . A radiation detector, comprising:

a plurality of radiation detection elements that are arranged in a two-dimensional direction;

data collecting circuitry configured to collect a first count based on an output from a first detection element included in the radiation detection elements, and collect a second count based on an output from a second detection element of at least one second detection element; and

processing circuitry configured to determine a number of counts corresponding to a reconstruction position of the first detection element based on the first count and the second count, wherein the number of counts is a number of counts output from the first detection element that occurs when the radiation incident on the reconstruction position of the first detection element is entirely converted into charge at the reconstruction position,

wherein the processing circuitry is further configured to determine the output corresponding to the reconstruction position by using a first weight determined according to a first angle from a reference line to the first detection element in a direction in a plane including the first detection element and the second detection element out of the two-dimensional direction, and a second weight determined according to a second angle from the reference line to the second detection element, wherein a second weight is provided for each detection element of the at least one second detection element, and

wherein the first weight and the second weight are set based on a material that converts the radiation into any one of electron and visible light in the first detection element and the second detection element, a thickness of the material, and a first angle at which the radiation enters the first detection element, and

as the first angle increases, the first weight decreases and the second weight increases.

11 . An output determination method, comprising:

collecting a first output relating to a first detection element included in a plurality of radiation detection elements that are arranged in a two-dimensional direction, and a second output relating to a second detection element of at least one second detection element; and

determining an output corresponding to a reconstruction position of the first detection element based on the first output and the second output, wherein the determined output is an output from the first detection element that occurs when the radiation incident on the reconstruction position of the first detection element is entirely converted into charge at the reconstruction position,

wherein the method further comprises determining the output corresponding to the reconstruction position by using a first weight determined according to a first angle from a reference line to the first detection element in a direction in a plane including the first detection element and the second detection element out of the two-dimensional direction, and a second weight determined according to a second angle from the reference line to the second detection element, wherein a second weight is provided for each detection element of the at least one second detection element, and

wherein the first weight and the second weight are set based on a material that converts the radiation into any one of electron and visible light in the first detection element and the second detection element, a thickness of the material, and a first angle at which the radiation enters the first detection element, and

as the first angle increases the first weight decreases and the second weight increases.