X-ray computed tomography apparatus and imaging condition management apparatus
AssigneeCanon Medical Systems Corporation
InventorTakahiro Goto
Life of this patent
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Abstract
According to one embodiment, an X-ray computed tomography apparatus includes an X-ray tube, a detector, and processing circuitry. The X-ray tube emits X-rays. The detector detects X-rays that have been emitted from the X-ray tube and have passed through the subject. The processing circuitry sets an imaging condition. The processing circuitry evaluates the imaging condition based on information on a lower limit range of a count value of the detected X-rays that may cause image degradation.
Claims17
An X-ray computed tomography apparatus comprising:
- an X-ray tube configured to emit first X-rays;
- a detector configured to detect X-rays that have been emitted from the X-ray tube and have passed through a subject;
- and
- processing circuitry configured to:
- set an imaging condition;
- determine a lower limit range of a count value of the detected X-rays that may cause image degradation by referring to a threshold table of low count artifact, wherein the lower limit range defines an upper boundary of a range of a tube current value where the low count artifact occurs;
- and
- evaluate the imaging condition based on information on the lower limit range, wherein the threshold table includes a plurality of thresholds each determined by a water-equivalent thickness, a radiation quality parameter relating to at least one of a tube voltage and a type of wedge filter, and an acquisition mode selected from a plurality of acquisition modes, a read unit of the plurality of acquisition modes being different from each other.
An imaging condition management apparatus comprising processing circuitry configured to:
- set an imaging condition;
- determine a lower limit range of a count value of detected X-rays that may cause image degradation by referring to a threshold table of low count artifact, wherein the lower limit range defines an upper boundary of a range of a tube current value where the low count artifact occurs;
- and
- evaluate the imaging condition based on information on the lower limit range, wherein the threshold table includes a plurality of thresholds each determined by a water-equivalent thickness, a radiation quality parameter relating to at least one of a tube voltage and a type of wedge filter, and an acquisition mode selected by a plurality of acquisition modes, a read unit of the plurality of acquisition modes being different from each other.
An information processing method for X-ray computed tomography imaging, comprising:
- emitting first X-rays;
- detecting X-rays that have been emitted from an X-ray tube and have passed through a subject;
- setting an imaging condition;
- determining a lower limit range of a count value of the detected X-rays that may cause image degradation by referring to a threshold table of low count artifact, wherein the lower limit range defines an upper boundary of a range of a tube current value where the low count artifact occurs;
- and
- evaluating the imaging condition based on information on the lower limit range, wherein the threshold table includes a plurality of thresholds each determined by a water-equivalent thickness, a radiation quality parameter relating to at least one of a tube voltage and a type of wedge filter, and an acquisition mode selected from a plurality of acquisition modes, a read unit of the plurality of acquisition modes being different from each other.
Dependencies are inferred from the claim text.