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US 10,743,834 B2Granted
X-ray image diagnostic apparatus and method
AssigneeCanon Medical Systems Corporation
InventorsTooru Kato, Hiroaki Nakai
Life of this patent
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Abstract
An X-ray image diagnostic apparatus according to an embodiment includes a photon counting X-ray detector, calibration circuitry, and image generating circuitry. The photon counting X-ray detector includes a plurality of detection elements each of which is configured to detect X-rays and output a detection signal. The calibration circuitry calibrates a detection signal of each of the detection elements using a correction value calculated from a plurality of signals output from the detection elements and corresponding to a plurality of X-ray application conditions relating to continuous X-rays. The image generating circuitry generates an image using the calibrated detection signals of the detection elements.
Claims23
An X-ray image diagnostic apparatus comprising:
- a photon counting X-ray detector including a plurality of detection elements each of which is configured to detect X-rays and output a detection signal;
- calibration circuitry configured to calculate a feature point in an energy spectrum for each of the plurality of detection elements based on count values of the plurality of signals output from the plurality of detection elements and corresponding to respective X-ray application conditions relating to continuous X-rays, wherein the respective X-ray application conditions differ in at least one of a tube voltage and a tube current, calculate a correction value for each of the plurality of detection elements on the basis of the feature point, and calibrate the detection signal of each of the plurality of detection elements using the correction value;
- and
- image generating circuitry configured to generate an image using the calibrated detection signals of the plurality of detection elements.
1 more element
A method comprising:
- calculating a feature point in an energy spectrum for each of a plurality of detection elements (1) included in a photon counting X-ray detector and (2) configured to (2a) detect X-rays and (2b) output a detection signal, the feature point corresponding to respective X-ray application conditions relating to continuous X-rays, wherein the respective X-ray application conditions differ in at least one of a tube voltage and a tube current;
- calculating a correction value for each of the plurality of detection elements on the basis of the feature point;
- calibrating the detection signal of each of the plurality of detection elements using the correction value;
- and
- generating an image using the calibrated detection signals of the plurality of detection elements.
2 more elements
An X-ray image diagnostic comprising:
- a photon counting X-ray detector including a plurality of detection elements each of which is configured to detect X-rays and output a detection signal;
- calibration circuitry configured to (1) calculate a feature point in an energy spectrum based on count values of a plurality of signals output from the plurality of detection elements and (2) calibrate the detection signal of each of the plurality of detection elements using a correction value calculated using the feature point and from the plurality of signals output from the plurality of detection elements and corresponding to respective X-ray application conditions relating to continuous X-rays;
- and
- image generating circuitry configured to generate an image using the calibrated detection signals of the plurality of detection elements,
- wherein the calibration circuitry specifies as the feature point a peak value among the plurality of signals at which a ratio of a count value of a first signal to a count value of a second signal has a predetermined value.
2 more elements
An X-ray image diagnostic comprising:
- a photon counting X-ray detector including a plurality of detection elements each of which is configured to detect X-rays and output a detection signal;
- calibration circuitry configured to (1) calculate a feature point in an energy spectrum based on count values of a plurality of signals output from the plurality of detection elements and (2) calibrate the detection signal of each of the plurality of detection elements using a correction value calculated using the feature point and from the plurality of signals output from the plurality of detection elements and corresponding to respective X-ray application conditions relating to continuous X-rays;
- and
- image generating circuitry configured to generate an image using the calibrated detection signals of the plurality of detection elements,
- wherein the calibration circuitry specifies a peak value among the plurality of signals at which a count value of a first signal collected under presence of a filter removing X-rays of a predetermined band is equal to a count value of a second signal collected under absence of the filter, as he feature point.
2 more elements
An X-ray image diagnostic comprising:
- a photon counting X-ray detector including a plurality of detection elements each of which is configured to detect X-rays and output a detection signal;
- calibration circuitry configured to (1) calculate a feature point in an energy spectrum based on count values of a plurality of signals output from the plurality of detection elements and (2) calibrate the detection signal of each of the plurality of detection elements using a correction value calculated using the feature point and from the plurality of signals output from the plurality of detection elements and corresponding to respective X-ray application conditions relating to continuous X-rays;
- and
- image generating circuitry configured to generate an image using the calibrated detection signals of the plurality of detection elements,
- wherein the calibration circuitry calculates the correction value by linear regression using a first feature point specified from a first signal and a second signal with a first X-ray application condition and a second feature point specified from the first signal and the second signal with a second X-ray application condition.
2 more elements
Dependencies are inferred from the claim text.