Individual channel characterization of collimator
AssigneeSiemens Medical Solutions USA, Inc.
InventorsAlexander Hans Vija, Francesc dAssis Massanes Basi, Amos Yahill, Ronald E. Malmin
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Abstract
A framework for characterization of a collimator. In accordance with one aspect, first and second sides of the collimator are photographed to generate first and second image data. An optical characterization map (OCM) may be generated based on the first and second image data, wherein the optical characterization map characterizes the individual channels of the collimator. Quality assessment or image reconstruction may then be performed based on the OCM.
Claims20
A method of characterizing a large field-of-view collimator, comprising:
- providing at least one digital camera mounted at a fixed distance from the collimator, wherein the at least one digital camera and the collimator are contained in a light box;
- photographing, using the at least one digital camera, a first side of the collimator to generate a first image data;
- photographing, using the at least one digital camera, a second side of the collimator to generate a second image data;
- generating an optical characterization map (OCM) based on the first and second image data, including generating first and second optical maps based on the first and second image data using one or more image processing techniques and identifying pixels belonging to individual channels of the collimator based on the first and second optical maps, wherein the optical characterization map stores at least measurements of the individual channels of the collimator based on the first and second optical maps;
- and
- performing quality assessment based on the OCM, including determining sensitivities of the individual channels using the measurements stored in the OCM.
A system for characterizing a collimator, comprising:
- at least one digital camera mounted at a fixed distance from the collimator, wherein the at least one digital camera photographs first and second sides of the collimator to generate respective first and second image data, wherein the at least one digital camera and the collimator are contained in a light box;
- and
- a computer system communicatively coupled to the at least one digital camera, the computer system including a non-transitory memory device for storing computer readable program code, and a processor device in communication with the memory device, the processor device being operative with the computer readable program code to perform steps including
- receiving the first and second image data,
- generating an optical characterization map (OCM) based on the first and second image data, including generating first and second optical maps based on the first and second image data using one or more image processing techniques and identifying pixels belonging to individual channels of the collimator based on the first and second optical maps, wherein the OCM stores measurements of the individual channels of the collimator based on the first and second optical maps, and
- performing quality assessment based on the OCM, including determining sensitivities of the individual channels using the measurements stored in the OCM.
One or more non-transitory computer readable media embodying a program of instructions executable by a machine to perform operations, the operations comprising:
- receiving, from at least one digital camera, first and second image data of respective first and second sides of a collimator, wherein the first and second image data has a high spatial resolution of below at least 100 μm, wherein the at least one digital camera and the collimator are contained in a light box;
- generating an optical characterization map (OCM) based on the first and second image data, including generating first and second optical maps based on the first and second image data using one or more image processing techniques and identifying pixels belonging to individual channels of the collimator based on the first and second optical maps, wherein the OCM stores measurements of the individual channels of the collimator based on the first and second optical maps;
- performing quality assessment based on the OCM, including determining sensitivities of the individual channels using the measurements stored in the OCM;
- and
- transferring the OCM to an imaging system for performing image reconstruction.
Dependencies are inferred from the claim text.