Radiation Detector Tilt Compensation via Calibration Paths
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Solution Overview
Problem
Radiation delivery systems in radiotherapy face challenges in accurately calibrating and measuring radiation doses due to misalignment or tilt of the phantom relative to the radiation beam, which affects the precision of dose delivery.
Innovation Solution
The system employs a scanning system with a radiation detector that moves through multiple calibration paths and records responses to determine the tilt of the scanning system, allowing for the adjustment of measurement paths to account for this tilt, thereby ensuring accurate dose delivery by using programmable processors and machine-readable media to execute instructions for movement and data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the scanning system is assumed to be perfectly aligned with the water surface, then the measurement process is simplified, but measurement precision deteriorates due to unaccounted tilt
Solution Approach 1:
The system performs preliminary calibration by moving the radiation detector through three vertical calibration paths and recording responses before actual measurement. This preliminary action characterizes the scanning system tilt in advance, allowing the system to compensate for misalignment during subsequent measurements without adding complexity to the measurement process itself.
Solution Approach 2:
The system uses feedback from the three calibration measurements to dynamically determine the scanning system tilt and adjust measurement paths accordingly. The calibration data feeds into an algorithm that calculates tilt angles and compensates for them during actual radiation dose measurements, improving precision without requiring manual intervention.
2Measurement precision
If the system performs three vertical calibration paths to determine tilt, then measurement precision improves, but productivity decreases due to additional calibration time
Solution Approach 1:
The three vertical calibration paths are performed as a preliminary one-time setup procedure to characterize the scanning system tilt. Once the tilt is determined through this preliminary calibration, the system can perform subsequent radiation dose measurements efficiently without repeating the full calibration sequence, thus maintaining precision while improving productivity for actual measurements.
Solution Approach 2:
The system changes operational parameters by switching between calibration mode (three vertical paths) and measurement mode (adjusted measurement paths). The calibration establishes tilt parameters that are then used to modify measurement path parameters, allowing the system to achieve high precision measurements without repeatedly performing time-consuming calibration sequences.
3Measurement precision
If the radiation detector is moved through adjusted measurement paths that account for tilt, then measurement precision improves, but device complexity increases due to path calculation and control
Solution Approach 1:
The system replaces complex mechanical alignment adjustments with computational path adjustment. Instead of physically repositioning or releveling the scanning system hardware, the system uses software algorithms to calculate tilt-based corrections and adjusts measurement paths computationally, reducing mechanical complexity while maintaining measurement precision.
Solution Approach 2:
The system introduces an intermediary computational layer that translates calibration data into adjusted measurement paths. This intermediary processing layer, implemented through programmable processors, mediates between the physical scanning system and the measurement objectives, simplifying control by handling path adjustments through calculation rather than direct mechanical manipulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate radiation measurements and corrections for tilt, ensuring precise radiation delivery even when the phantom is misaligned or tilted, thereby improving the calibration and effectiveness of radiation therapy.
Implementation Method 1
moving the radiation detector through a first vertical calibration path and recording a first radiation detector response
Data Source
AI summary
Systems, methods, and computer program products that are configured to account for tilt of a radiation measurement system are disclosed. In one embodiment, a system includes a scanning system with a radiation detector, the scanning system configured to enable movement of the radiation detector. The system also includes a non-transitory machine-readable medium storing instructions which, when executed by at least one programmable processor, cause the at least one programmable processor to perform various operations including moving the radiation detector through a first, second, and third vertical calibration path and recording a first, second, and third radiation detector response within 3 cm of a water surface, and controlling the scanning system to move the radiation detector through at least one measurement path that takes into account a scanning system tilt, the at least one measurement path determined based on at least the first, second, and third radiation detector responses.