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US 10,648,930 B2Granted
Apparatus for determining an effective energy spectrum of an X-ray tube
AssigneeKoninklijke Philips N.V.
InventorsKlaus Jürgen Engel, Gereon Vogtmeier, Rolf Karl Otto Behling
Life of this patent
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Abstract
The present invention relates to an apparatus for determining an effective energy spectrum of an X-ray tube. It is described to provide (210) a temporally varying acceleration voltage of an X-ray tube for a time period. A temporally varying X-ray tube current is also provided (220) for the time period. At least one product of the temporally varying X-ray tube current and a time interval is determined (230). An effective energy spectrum of the X-ray tube processing the X-ray tube is determined (250) as a function of the at least one product of the temporally varying X-ray tube current and the time interval and as a function of the voltage of the X-ray tube.
Claims11
A method for determining an effective energy spectrum of an X-ray tube, comprising:
- providing a temporally varying acceleration voltage of the X-ray tube for a predetermined time period that is divided into a predetermined number of time intervals, wherein the temporally varying acceleration voltage is provided at a first temporal sampling frequency configured to resolve at least some temporally varying voltage ripples;
- providing a temporally varying current of the X-ray tube for the predetermined time period, wherein the temporally varying current is provided at a second temporal sampling frequency configured to resolve at least some temporally varying current ripples;
- determining at least one result as a first function of the temporally varying current and a time interval;
- and
- determining an effective energy spectrum of the X-ray tube as a second function of the at least one result and the temporally varying acceleration voltage.
2 more elements
A method for determining an object related quantity based on X-ray image data, the method comprising:
- providing the X-ray image data of an object over a predetermined acquisition time that is divided into a predetermined number of time intervals;
- providing a temporally varying acceleration voltage of the X-ray tube during the predetermined acquisition time of the X-ray image data, wherein the temporally varying acceleration voltage is provided at a first temporal sampling frequency configured to resolve at least some temporally varying voltage ripples;
- providing a temporally varying current of the X-ray tube during the predetermined acquisition time of the X-ray image data, wherein the temporally varying current is provided at a second temporal sampling frequency configured to resolve at least some temporally varying current ripples;
- determining at least one result as a first function of the temporally varying current and a time interval;
- determining an effective energy spectrum of the X-ray tube as a second function of the at least one result and the temporally varying acceleration voltage;
- determining at least one object related quantity as a function of the X-ray image data and the effective energy spectrum;
- and
- outputting of data representative of the at least one object related quantity.
5 more elements
An apparatus for determining an effective energy spectrum of an X-ray tube, comprising:
- an input unit configured to provide a temporally varying acceleration voltage of the X-ray tube for a predetermined time period that is divided into a predetermined number of time intervals, the temporally varying acceleration voltage being provided at a first temporal sampling frequency configured to resolve at least some temporally varying voltage ripples, the input unit being further configured to provide a temporally varying current of the X-ray tube for the predetermined time period, the temporally varying current being provided at a second temporal sampling frequency configured to resolve at least some temporally varying current ripples;
- and
- a processing unit configured to determine at least one result as a first function of the temporally varying current and a time interval, the processing unit being further configured to determine an effective energy spectrum of the X-ray tube as a second function of the at least one result and the temporally varying acceleration voltage.
A system for determining object related quantities based on X-ray image data, the system comprising:
- an image acquisition unit configured to provide the X-ray image data of an object acquired over a predetermined acquisition time;
- a voltage acquisition unit configured to provide a temporally varying acceleration voltage of an X-ray tube during the predetermined acquisition time of the X-ray image;
- a current acquisition unit configured to provide a temporally varying current of the X-ray tube during the predetermined acquisition time of the X-ray image data;
- an apparatus for determining an effective energy spectrum of an X-ray tube, comprising:
- an input unit configured to provide a temporally varying acceleration voltage of the X-ray tube for the predetermined acquisition time that is divided into a predetermined number of time intervals, the temporally varying acceleration voltage being provided at a first temporal sampling frequency configured to resolve at least some temporally varying voltage ripples, the input unit being further configured to provide a temporally varying current of the X-ray tube for the predetermined acquisition time, the temporally varying current being provided at a second temporal sampling frequency configured to resolve at least some temporally varying current ripples;
- and
- a processing unit configured to determine at least one result as a first function of the temporally varying current and a time interval, the processing unit being further configured to determine an effective energy spectrum of the X-ray tube as a second function of the at least one result and the temporally varying acceleration voltage;
- wherein the apparatus is configured to determine the effective energy spectrum of the X-ray tube for the predetermined acquisition time of the X-ray image data;
- wherein the processing unit is configured to determine at least one object related quantity as a function of the X-ray image data and the effective energy spectrum;
- and
- an output unit configured to output data representative of the at least one object related quantity.
8 more elements
A non-transitory computer-readable medium having one or more executable instructions stored thereon, which when executed by a processor, cause the processor to perform a method for determining an effective energy spectrum of an X-ray tube, the method comprising:
- providing a temporally varying acceleration voltage of the X-ray tube for a predetermined time period that is divided into a predetermined number of time intervals, wherein the temporally varying acceleration voltage is provided at a first temporal sampling frequency configured to resolve at least some temporally varying voltage ripples;
- providing a temporally varying current of the X-ray tube for the predetermined time period, wherein the temporally varying current is provided at a second temporal sampling frequency configured to resolve at least some temporally varying current ripples;
- determining at least one result as a first function of the temporally varying current and a time interval;
- and
- determining an effective energy spectrum of the X-ray tube as a second function of the at least one result and the temporally varying acceleration voltage.
2 more elements
Dependencies are inferred from the claim text.