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US 10,702,710 B2Granted
System and methods for processing images to measure collimator leaf and collimator performance
AssigneeVarian Medical Systems, Inc.
InventorStephen Gaudio
Life of this patent
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Abstract
Systems and methods are proposed for accurate and efficient automatic measurement of jaw and leaf positioning in multi-leaf collimator imaging systems. Specifically, the method enables the automated and objective processing of images to determine characteristics of collimator jaws and MLC leaves. These novel techniques enable verification of collimator component positioning to ensure accurate beam modulation for radiation application procedures.
Claims20
A radiation system comprising:
- a gantry;
- a radiation source coupled to the gantry and operable to generate a stream of irradiated particles;
- a multi-leaf collimator (MLC) comprising a plurality of leaves configured to attenuate the stream of irradiated particles;
- a detector coupled to the gantry and operable to receive the stream of irradiated particles;
- and
- an image processor coupled to the detector and operable to generate image data corresponding to an image from the stream of irradiated particles received in the detector, wherein the image processor is further configured to calculate a plurality of measurements corresponding to a plurality of respective leaf positions of the plurality of leaves based on the image generated by the image processor and pre-entered characteristics corresponding to the radiation system and the image data, the pre-entered characteristics comprising a plurality of first predetermined characteristics related to the MLC and a plurality of second predetermined characteristics related to the detector or the image processor.
3 more elements
A radiation therapy and imaging system comprising:
- a source of a radiation beam;
- a multi-leaf collimator (MLC) operable to modify the radiation beam;
- and
- a radiation imager operable to receive and detect radiation from the radiation beam to generate an image that shows the MLC, wherein the radiation therapy and imaging system is further operable to access pre-entered characteristics corresponding to the radiation therapy and imaging system and the image, the pre-entered characteristics comprising a plurality of first predetermined characteristics related to the MLC and a plurality of second predetermined characteristics related to the radiation imager, and wherein the radiation therapy and imaging system is further operable to use the pre-entered characteristics and the image to verify a position of the MLC by iteratively converging a calculated position, which is based on a plurality of pixel values of the image, relative to an expected position.
1 more element
A radiation therapy and imaging system comprising:
- a radiation source that is configured to generate a radiation beam;
- a multi-leaf collimator (MLC) operable to modify the radiation beam and comprising a plurality of leaves;
- and
- a radiation imager operable to receive and detect radiation from the radiation beam to generate an image that shows the plurality of leaves, wherein the radiation therapy and imaging system is further operable to access pre-entered characteristics corresponding to the radiation therapy and imaging system and the image, the pre-entered characteristics comprising a plurality of first predetermined characteristics related to the MLC and a plurality of second predetermined characteristics related to the radiation imager, and wherein the radiation therapy and imaging system is further operable to use the pre-entered characteristics and the image to verify a plurality of respective leaf positions of the plurality of leaves by iteratively converging a plurality of respective calculated leaf positions, which are based on a plurality of pixel values of the image, relative to a plurality of respective expected leaf positions.
1 more element
Dependencies are inferred from the claim text.