Automated Radiation Therapy QA Using Motorized Water Phantom
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Solution Overview
Problem
Current radiation therapy device commissioning and periodic quality assurance verification processes are time-consuming, labor-intensive, and prone to human errors due to the need for manual positioning of reference detectors and operator-dependent synchronization of radiation beams and positions, which reduces the availability of the device for patient treatments and compromises measurement quality.
Innovation Solution
An apparatus and method that automate the positioning of field radiation detectors and reference detectors using a motorized water phantom and QA controller, enabling synchronized and efficient execution of radiation beam sequences, with automatic adjustment of detector gains and real-time monitoring of dose rates, reducing operator intervention and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual positioning of reference detectors and operator-dependent synchronization are used, then measurement flexibility is maintained, but time consumption increases and human errors occur
Solution Approach 1:
The system performs self-positioning of the reference detector and automatic synchronization of beam sequences without operator intervention. The detector automatically moves to predefined positions and the system self-regulates timing, eliminating manual positioning and reducing human error while maintaining measurement reliability.
Solution Approach 2:
Manual mechanical positioning operations are replaced by an automated positioning system with predefined trajectories. The mechanical movement of the detector is controlled by programmable paths rather than manual adjustment, enabling consistent and error-free positioning across multiple measurements.
2Measurement precision
If comprehensive measurements are performed for multiple fields and positions, then measurement precision is improved, but device availability for patient treatments decreases
Solution Approach 1:
Measurement positions and beam sequences are pre-programmed in the system before actual measurements. The QA controller automatically executes predefined measurement plans, allowing comprehensive verification to be performed efficiently without requiring extended operator involvement or prolonged device downtime.
Solution Approach 2:
The system enables continuous automated measurement execution without interruption for operator intervention. Multiple fields and positions can be measured in sequence automatically, maintaining device availability while completing comprehensive verification protocols that would otherwise require extensive manual operation time.
3Ease of operation
If automated positioning is implemented, then operator intervention is reduced, but system complexity increases
Solution Approach 1:
The positioning system and QA controller serve multiple functions: they control detector movement, manage beam sequencing, synchronize measurements, and verify dosimetry. By consolidating these functions into a single multi-functional system, complexity is managed more effectively than through separate dedicated systems for each function.
Data Source
AI summary
This disclosure is related to an apparatus and method for commissioning or performing a quality assurance (QA) verification of a radiation therapy (RT) device. The device may comprise: (a) a motorised water phantom; (b) a RT controller configured for obtaining operation parameters of fields, and causing the RT device to emit a beam according to said operations parameters; (c) a QA controller having a memory for storing a measurements plan, the measurements plan including data defining a sequence of fields, and d) a reference radiation detector adapted and positioned for intercepting said radiation beam and for measuring the dose rate of said radiation beam. The reference radiation detector may be substantially transparent to the radiation beam. The QA controller may include an acquisition interface for acquiring and storing the dose rate from the reference radiation detector. The device may also include a processor configured to check the synchronism between the dose rate from the field radiation detector and the dose rate from the reference radiation detector.