Systems and methods for determining geometric parameters of imaging devices
AssigneeVarian Medical Systems, Inc.
InventorsAndrew G. Jeung, Hassan Mostafavi, Alexander Sloutsky
Life of this patent
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Abstract
A method of determining a geometric parameter of a machine includes using the machine to obtain an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other, determining a position of the structure based on a pattern of the markers in the image, and determining a geometric parameter of the machine based at least in part on the determined position of the structure.
Claims49
A method of determining a geometric parameter of a machine, comprising:
- using the machine to obtain an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- determining a position of the structure based on a pattern of the markers in the image;
- and
- determining a geometric parameter of the machine based at least in part on the determined position of the structure.
A method of determining a geometric parameter of a machine, comprising:
- using the machine to obtain an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- determining a position of the structure based on a pattern of the markers in the image;
- and
- determining a geometric parameter of the machine based at least in part on the determined position of the structure;
- wherein the obtained image contains a subset of the plurality of markers, and the position of the structure is determined based on a pattern of the subset of markers in the image.
A method of determining a geometric parameter of a machine, comprising:
- using the machine to obtain an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- determining a position of the structure based on a pattern of the markers in the image;
- and
- determining a geometric parameter of the machine based at least in part on the determined position of the structure;
- wherein the step of determining the position of the structure comprises:
- estimating a position of the structure;
- calculating projected marker positions that correspond with the estimated position of the structure;
- comparing the projected marker positions with the positions of the markers obtained from the image;
- and
- adjusting the estimated position based on a result from the step of comparing.
A method of determining a geometric parameter of a machine, comprising:
- using the machine to obtain an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- determining a position of the structure based on a pattern of the markers in the image;
- and
- determining a geometric parameter of the machine based at least in part on the determined position of the structure;
- wherein the machine is configured to obtain images in a half-fan configuration.
A method of determining a geometric parameter of a machine, comprising:
- using the machine to obtain an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- determining a position of the structure based on a pattern of the markers in the image;
- and
- determining a geometric parameter of the machine based at least in part on the determined position of the structure;
- wherein the machine comprises a first source for providing diagnostic energy, and a second source for providing treatment energy.
A method of determining a geometric parameter of a machine, comprising:
- using the machine to obtain an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- determining a position of the structure based on a pattern of the markers in the image;
- and
- determining a geometric parameter of the machine based at least in part on the determined position of the structure;
- wherein the machine comprises a plurality of radiation sources.
A system for determining a geometric parameter of a machine, comprising:
- a processor configured to receive an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- wherein the processor is further configured to determine a position of the structure based on a pattern of the markers in the image, and determine a geometric parameter of the machine based at least in part on the determined position of the structure.
A computer program product including a non-transitory medium useable by a processor, the medium having a set of instructions, an execution of which causes a process to be performed, wherein the medium comprises a volatile or non-volatile medium, the process comprising:
- receiving an image of at least a portion of a structure, the structure having a plurality of markers, wherein the markers have predetermined position(s) relative to each other;
- determining a position of the structure based on a pattern of the markers in the image;
- determining a geometric parameter of a machine based at least in part on the determined position of the structure;
- and
- storing the determined geometric parameter.
A method of determining a geometric parameter of a machine, comprising:
- using the machine to obtain images of at least a portion of a structure at a plurality of gantry angles;
- determining positions of the structure relative to a reference frame of the machine based on the obtained images at the plurality of gantry angles;
- determining a first point on the structure;
- determining a second point on the structure;
- and
- determining an axis of rotation in a three-dimensional space based at least in part on the determined first and second points on the structure.
A system for determining a geometric parameter of a machine, comprising:
- a processor configured to obtain images of at least a portion of a structure at a plurality of gantry angles;
- wherein the processor is further configured to
- determine positions of the structure relative to a reference frame of the machine based on the obtained images at the plurality of gantry angles,
- determine a first point on the structure,
- determine a second point on the structure, and
- determine an axis of rotation in a three-dimensional space based at least in part on the determined first and second points on the structure.
A computer program product including a non-transitory medium useable by a processor, the medium having a set of instructions, an execution of which causes a process to be performed, wherein the medium comprises a volatile or non-volatile medium, the process comprising:
- receiving images of at least a portion of a structure at a plurality of gantry angles;
- determining positions of the structure relative to a reference frame of the machine based on the obtained images at the plurality of gantry angles;
- determining a first point on the structure;
- determining a second point on the structure;
- determining an axis of rotation in a three-dimensional space based at least in part on the determined first and second points on the structure;
- and
- storing data regarding the determined axis of rotation.
A method of determining a geometric parameter of a machine, comprising:
- placing a filter in front of a radiation source;
- using the machine to obtain a first image at a first gantry angle and a second image at a second gantry angle;
- determining a first point in a first image that represents the intersection between a center line of a radiation beam generated at the first gantry angle and a plane of the first image;
- determining a second point in a second image that represents the intersection between a center line of a radiation beam generated at the second gantry angle and a plane of the second image;
- determining a first line that includes the first point;
- determining a second line that includes the second point;
- and
- determining a geometric parameter of the machine based at least in part on the first line and the second line.
A system for determining a geometric parameter of a machine, comprising:
- a filter configured to be secured in front of a radiation source;
- and
- a processor, wherein the processor is configured to obtain a first image at a first gantry angle and a second image at a second gantry angle, wherein the first and the second images are generated using the machine,
- determine a first point in a first image that represents the intersection between a center line of a radiation beam at the first gantry angle and a plane of the first image,
- determine a second point in a second image that represents the intersection between a center line of a radiation beam at the second gantry angle and a plane of the second image,
- determine a first line that includes the first point,
- determining a second line that includes the second point, and
- determine a geometric parameter of the machine based at least in part on the first line and the second line.
A computer product including a non-transitory medium useable by a processor, the medium having a set of instructions, an execution of which causes a process to be performed, wherein the medium comprises a volatile or non-volatile medium, the process comprising:
- obtaining a first image at a first gantry angle and a second image at a second gantry angle, wherein the first and the second images are generated using a radiation source and a filter placed in front of the radiation source;
- determining a first point in a first image that represents the intersection between a center line of a radiation beam at the first gantry angle and a plane of the first image;
- determining a second point in a second image that represents the intersection between a center line of a radiation beam at the second gantry angle and a plane of the second image;
- determining a first line that includes the first point;
- determining a second line that includes the second point;
- determining a geometric parameter of the machine based at least in part on the first line and the second line;
- and
- storing the determined geometric parameter.
A method for use to determine a geometric parameter of a machine, comprising:
- verifying an isocenter of a machine using a processor;
- wherein the act of verifying the isocenter is performed without a need to place a marker at the isocenter of the machine.
A system for use in a process to determine a geometric parameter of an imaging device, comprising:
- a structure having a three-dimensional configuration;
- and
- a plurality of markers secured to the structure;
- wherein the plurality of markers are positioned relative to each other such that their positions collectively form an irregular pattern, and wherein the plurality of markers collectively occupies a three-dimensional space.
Dependencies are inferred from the claim text.