Imaging-based self-adjusting radiation therapy systems, devices, and methods
AssigneesVarian Medical Systems, Inc., Varian Medical Systems 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.
Claims58
A method for calibrating a radiation treatment device, the radiation treatment device including control elements configured to control parameters of the radiation treatment device, the method comprising:
- (i) acquiring, using an imaging device, one or more images representing beam fields produced by a beam source;
- (ii) determining a parameter of the radiation treatment device from the one or more images, the parameter relating to an output of a control element;
- (iii) evaluating the parameter against a predefined standard;
- (iv) adjusting the output of the control element based on the result of the evaluating until the parameter meets the predefined standard;
- and
- (v) repeating steps (i) through (iv) until the parameters are evaluated and the outputs of the control elements are adjusted,
- wherein one of the parameters to be evaluated is the imaging device position from the beam source, the evaluating including:
- acquiring a first and a second image in (i) with the imaging device positioned at two different locations;
- and
- calculating the distance of the imaging device from the beam source based on an amount by which the imaging device was moved between the two locations, and a size of the beam field at the first location of the imaging device, and a size of the beam field at the second location of the imaging device.
A computer-readable medium having instructions thereon for calibrating a radiation treatment system that includes an electronic portal imaging device (EPID) and control elements, said instructions being configured to instruct a computer processor to perform the steps comprising:
- (i) acquiring one or more images using the EPID, the images representing beam fields produced by a beam source;
- (ii) determining a parameter of the radiation treatment device from the one or more images, the parameter relating to an output of a control element;
- (iii) evaluating the parameter against a predefined standard;
- (iv) adjusting the output of the control element based on the result of the evaluating until the parameter meets the predefined standard;
- and
- (v) repeating steps (i) through (iv) until the parameters of the system are evaluated and the outputs of the control elements are adjusted,
- wherein one of the parameters to be evaluated is the imaging device position from the beam source, the evaluating including:
- acquiring a first and a second image in (i) with the imaging device positioned at two different locations;
- and
- calculating the distance of the imaging device from the beam source based on an amount by which the imaging device was moved between the two locations, and a size of the beam field at the first location of the imaging device, and a size of the beam field at the second location of the imaging device.
Dependencies are inferred from the claim text.