Method and system for calculating dose of radiotherapy ray plane detector

Abstract

The invention discloses a method for calculating dose of a radiotherapy ray plane detector and a matched system. The method comprises the content of calibrating parameters of a depth deviation model of a measurement plane; receiving a three-dimensional external irradiation treatment plan for a patient and a depth position of the measurement plane from a radiotherapy treatment planning system (TPS); calculating a depth deviation of the measurement plane of each beam according to a therapy apparatus head angle of the beam and the depth deviation model of the measurement plane; calculating a dosedistribution on the measurement plane after the depth position shifts according to the treatment plan and the depth deviation of each beam; superposing the dose distribution of each beam on the measurement plane after shifting, and generating the dose on the calibrated measurement plane of the detector.

Description

technical field [0001] The invention relates to a method for calculating the dose of a radiation detector, in particular to a method and system for calculating the dose of a radiotherapy ray plane detector. Background technique [0002] Contemporary radiotherapy techniques, such as intensity-modulated radiotherapy (IMRT) and volume-modulated radiotherapy (VMAT), need to control radiotherapy equipment to irradiate the patient's body containing tumor or cancer from different angles in a more complicated way, so that Improve the efficiency and safety of treatment while reducing the damage to surrounding human tissues. This makes radiotherapy planning increasingly complex and the importance of plan validation ever-increasing. [0003] When verifying the patient's radiotherapy plan, it is necessary to execute the corresponding verification plan on a specific water model, and use a radiotherapy ray detector to obtain the radiation dose absorbed at the specified location. The exp...

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Problems solved by technology

In compound field verification (that is, each field does not rotate to 0 degrees, but is located in the original position set in the plan), physicists generally choose non-planar detectors with special designs (for example: ArcCHECK), so that Eliminate the influence of the field angle on the planar detector in design, but the cost is relatively expensive; or choose a high-precision film without angle dependence for measurement, but the calibration and scanning process of the film is quite complicated and cumbersome

[0005] At present, as a dose verification tool for radiotherapy planning, the planar detector lacks a method to correct the calculated dose of non-perpendicularly incident rays on the detector based on its own structural characteristics to conform to the measured value of the detector

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