Imaging-based self-adjusting radiation therapy systems, devices, and methods
AssigneesVarian Medical Systems, Inc., Siemens Healthineers International AG
InventorsRobert T. Wiggers, Daryl Leung, Reto W. Filiberti, Daniel Morf, Diana Kung, Stephen Gaudio
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Abstract
Systems, devices, and methods are presented for automatic tuning, calibration, and verification of radiation therapy systems comprising control elements configured to control parameters of the radiation therapy systems based on images obtained using electronic portal imaging devices (EPIDs) included in the radiation therapy system.
Claims19
A non-transitory computer-readable medium containing instructions thereon for calibrating a radiation treatment device, which when executed by a processor, instruct the processor to perform the following steps:
- determine one or more parameters of the radiation treatment device from one or more images received from an imaging device of the radiation treatment device, the one or more parameters relating to an output of one or more control elements of the radiation treatment device;
- evaluate the one or more parameters against corresponding predefined standards;
- and
- adjust an output of one or more control elements based on the result of the evaluating,
- wherein the parameters include beam symmetry, beam flatness, beam energy, beam asymmetry, beam alignment, beam dose linearity, beam field size, beam position, beam shape, collimator position from isoplane, and the imaging device position with respect to a coordinate fame of the radiation treatment device, and
- wherein the control elements include control elements that affect the one or more determined parameters,
- the control elements including beam collimator devices, beam angle steering coils, beam position steering coils, shunt current sources, imaging device moving arms, beam flattening filters, beam scattering filters, dosimeters, gantry positioning devices, light sources, X-ray sources, and gun-cathode heating controls.
A non-transitory computer-readable medium containing instructions thereon for calibrating a radiation treatment device, which when executed by a processor, instruct the processor to perform the following steps:
- send instructions to an imaging device of the radiation treatment to generate a set of images of beam fields produced by a beam source of the radiation treatment device;
- determine a first parameter of the radiation treatment device from beam field information contained in the set of images;
- evaluate whether the first parameter falls within a corresponding prescribed range;
- adjust one or more control elements of the radiation treatment device if the first parameter does not fall within the prescribed range;
- instruct the imaging device to generate another set of images of beam fields, and determining a second parameter from the another set of images;
- and
- repeat the evaluating and adjusting for the second parameter,
- wherein the one or more control elements that are adjusted are control elements that affect the first and second parameters, and
- wherein the control elements include beam collimator devices, beam angle steering coils, beam position steering coils, shunt current sources, imaging device moving arms, beam flattening filters, beam scattering filters, dosimeters, gantry positioning devices, light sources, X-ray sources, and gun-cathode heating controls.
A non-transitory computer-readable medium containing instructions thereon for calibrating a radiation treatment device, which when executed by a processor, instruct the processor to perform the following steps:
- generate images representing beam fields produced by a beam source of the radiation treatment device using an imaging device;
- and
- using information obtained from the generated images to:
- calibrate the imaging device's axis of motion with respect to the radiation treatment device;
- and
- calibrate one or more elements of the radiation treatment device that affect one or more parameters of the radiation treatment device,
- the parameters including beam alignment, beam symmetry, beam asymmetry, beam shape, beam energy, beam flatness, beam dose linearity, beam field size, beam position, imaging device position, and collimator position from an isoplane of the radiation treatment device, and
- the elements including the beam source, collimator devices, beam angle steering coils, beam position steering coils, shunt current sources, imaging device moving arms, beam flattening filters, beam scattering filters, dosimeters, gantry positioning devices, light sources, X-ray sources, and gun-cathode heating controls.
Dependencies are inferred from the claim text.