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US 9,179,533 B2Granted
X-ray tube arc ride through
AssigneeKoninklijke Philips N. V.
InventorsLester D. Miller, Jaisingh Udaysingh Rajwade
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Abstract
A method includes identifying projection data generated during an x-ray tube arc event, determining x-ray tube voltages for data points of the identified projection data, correcting the identified data points based on the determined x-ray tube voltages for the data points, and reconstructing projection data that includes projection data generated during non x-ray tube arc events and the corrected projection data, and a system includes a projection data processor (116) that corrects projection data corresponding to data acquired during an x-ray tube arc event.
Claims17
A method, comprising:
- (a) detecting unobstructed radiation with a first detector;
- (b) concurrently detecting unobstructed radiation with a second detector,
- wherein the second detector includes a filter material with a known thickness and spectral characteristics and the first detector does not include any filter;
- (c) determining a ratio of output data from the first detector to the second detector;
- performing (a)-(c) for a plurality of known tube voltages;
- and
- generating a mapping between the ratio and tube voltage as a function of the tube voltages;
- identifying projection data generated during an x-ray tube arc event;
- determining x-ray tube voltages for data points of the identified projection data, wherein determining the x-ray tube voltages for the data points includes determining the x-ray tube voltages based on the mapping;
- correcting the identified data points based on the determined x-ray tube voltages for the data points, wherein the data points are corrected based on the following transformation:
- u
- corrected
-
- =
- (
- a
- (
- kV
- -
- b
- )
- 0.5
- )
- +
- c
- where ucorrected is the corrected projection data, kV is the determined x-ray tube voltage and a, b and c are constants in units of a thickness of the filter material determined by performing three scans at three known voltages and solving three simultaneous equations;
- reconstructing projection data that includes projection data generated during non x-ray tube arc events and the corrected projection data, which generates volumetric image data;
- and
- displaying on a display unit the volumetric image data generated by reconstructing the projection data that includes the projection data generated during non x-ray tube arc events and the corrected projection data.
26 more elements
A system, comprising:
- a projection data processor that corrects projection data corresponding to data acquired during an x-ray tube arc event based on the following transformation:
- u
- corrected
-
- =
- (
- a
- (
- kV
- -
- b
- )
- 0.5
- )
- +
- c
- where ucorrected is corrected projection data, kV is an x-ray tube voltage, and a, b and c are constants in units of a thickness of a filter material determined by performing three scans at three known voltages and solving three simultaneous equations;
- a reconstructor that reconstructs projection data that includes projection data generated during non x-ray tube arc events and the corrected projection data which generates volumetric image data and
- a display unit that displays the volumetric image data generated by reconstructing the projection data that includes the projection data generated during non x-ray tube arc events and the corrected projection data.
16 more elements
A method of correcting data collected during an x-ray tube arc, comprising:
- identifying the tube arc;
- establishing a relationship between x-ray attenuation values and x-ray tube voltage;
- determining one or more x-ray tube voltages at different time periods during the tube arc;
- correcting the x-ray attenuation values based on the following transformation:
- u
- corrected
-
- =
- (
- a
- (
- kV
- -
- b
- )
- 0.5
- )
- +
- c
- where ucorrected is corrected projection data, kV is the one or more x-ray tube voltages, and a, b and c are constants in units of a thickness of the filter material determined by performing three scans at three known voltages and solving three simultaneous equations;
- reconstructing projection data that includes projection data generated during non x-ray tube arc events and the corrected projection data, which generates volumetric image data:
- and
- displaying on a display unit the volumetric image data generated by reconstructing the projection data that includes the projection data generated during non x-ray tube arc events and the corrected projection data.
20 more elements
Dependencies are inferred from the claim text.