Patient positioning apparatus for a radiotherapy system
AssigneeElekta Beijing Medical Systems Co., Ltd
InventorsFei YU, Guangrui GUO, Xueyuan ZOU
Life of this patent
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Abstract
An approach for calibrating a radiotherapy positioning apparatus having a patient support surface that is moveable by a mechanism comprises obtaining, at multiple positions of the support surface, outputs of a patient support surface position sensor and a mechanism position encoder and using those outputs to determine a relationship between the sensor and encoder outputs.
Claims20
A method for calibrating a radiotherapy patient positioning apparatus, the radiotherapy patient positioning apparatus comprising:
- a patient support surface;
- a sensor for measuring a position of the patient support surface;
- a movement mechanism for moving the patient support surface;
- and
- an encoder for encoding an internal position of the movement mechanism, wherein a smallest change of the internal position that the encoder is able to resolve causes a positional change in the patient support surface that is smaller than the smallest change in position of the patient support surface that the sensor is able to resolve, the method comprising:
- taking one or more readings from the sensor and encoder at a first position of the patient support surface;
- using the movement mechanism to move the patient support surface to a second position and taking one or more readings from the sensor and encoder at the second position;
- and
- analyzing the one or more readings from the sensor and encoder at the first position of the patient support surface and the one or more readings from the sensor and encoder at the second position of the patient support surface to determine a relationship between each of the encoder readings and the respective positions of the patient support surface.
A system comprising:
- a radiotherapy apparatus, the radiotherapy apparatus comprising:
- a patient support surface;
- a sensor configured to measure a position of the patient support surface;
- a movement mechanism configured to move the patient support surface;
- an encoder configured to encode an internal position of the movement mechanism;
- a processor;
- and
- memory, with instructions stored thereon which, when performed by the processor, cause the processor to:
- take one or more readings from the sensor and the encoder at a first position of the patient support surface;
- cause the movement mechanism to move the patient support surface to a second position;
- take one or more readings from the sensor and the encoder at the second position;
- and
- analyze the one or more readings from the sensor and encoder at the first position and the one or more readings from the sensor and encoder at the second position to determine a relationship between each of the encoder readings and the respective positions of the patient support surface.
A non-transitory computer-readable medium containing instructions that, when executed by a processor, cause a radiotherapy system to;
- take one or more readings from a sensor and an encoder of the radiotherapy system at a first position of a patient support surface of the radiotherapy system;
- cause a movement mechanism of the radiotherapy system to move the patient support surface to a second position;
- take one or more readings from the sensor and the encoder at the second position;
- and
- analyze the one or more readings from the sensor and encoder at the first position and the one or more readings from the sensor and encoder at the second position to determine a relationship between each of the encoder readings and the respective positions of the patient support surface.
Dependencies are inferred from the claim text.