Radiotherapy Detector Segmentation for Cost and Radiation Damage
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Solution Overview
Problem
Existing radiotherapy devices with integrated portal imaging detectors are costly and have a short operational lifetime due to their high sensitivity and large size, optimized for megavoltage beams, which limits their effectiveness for quality assurance tasks.
Innovation Solution
A radiotherapy apparatus with a detection device comprising a high-resolution primary detector for central axis detection and lower-resolution secondary detectors for leaf position detection, configured to reduce cost and improve durability by minimizing active components and extending detector lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large high-sensitivity detector panel is used for patient imaging with MV beams, then imaging quality and quantum efficiency are improved, but cost and susceptibility to radiation damage increase
Solution Approach 1:
The detection device is divided into multiple independent detector modules arranged in an array. Each module can be independently replaced if damaged, rather than replacing the entire large detector panel. This segmentation reduces the impact of radiation damage on the overall system and lowers replacement costs.
Solution Approach 2:
The detector modules are designed to be relatively inexpensive and replaceable components. When a module becomes damaged from radiation exposure, only that specific module needs to be replaced rather than the entire expensive detector panel, effectively treating detector modules as disposable or limited-life components.
2Measurement precision
If a large detector panel with high sensitivity is used, then patient imaging performance is improved, but the detector must be replaced frequently due to radiation damage
Solution Approach 1:
The detector is segmented into multiple independent modules that can be replaced individually. This allows the system to maintain high imaging performance while extending the operational lifetime of the overall detection device through selective replacement of only damaged modules.
Solution Approach 2:
Damaged detector modules can be discarded and replaced with new or refurbished modules. The system recovers functionality by replacing only the failed components rather than the entire detector assembly, thereby extending the operational lifetime of the detection device.
3Measurement precision
If a high-resolution detector is used across the entire panel, then imaging resolution is improved, but cost and complexity increase
Solution Approach 1:
Different regions of the detection device can use detectors with different resolutions optimized for their specific functions. For example, central regions requiring high resolution for patient imaging can use high-resolution detectors, while peripheral regions can use lower-resolution detectors, reducing overall complexity and cost.
Solution Approach 2:
The detection device is segmented into multiple modules that can have different resolution characteristics based on their specific functional requirements. This allows optimization of resolution where needed while reducing complexity in other areas.
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
The apparatus provides efficient quality assurance and dosimetry data while being more cost-effective and resistant to radiation damage, allowing for periodic replacement and improved beam alignment accuracy.
Implementation Method 1
a first detector arranged to detect a position of the central axis, wherein the first detector comprises a two dimensional array of pixels for generating a two dimensional map of radiation intensity
Implementation Method 2
at least one second detector arranged to detect a position of each leaf of the plurality of leaves
Data Source
AI summary
Disclosed herein is a radiotherapy apparatus comprising a radiation source configured to emit a beam of radiation having a central axis, a multi-leaf collimator, MLC, for shaping the beam of radiation emitted by the radiation source, wherein the MLC comprises a plurality of leaves, and a detection device for detecting radiation emitted by the radiation source. The detection device comprises a first detector arranged to detect a position of the central axis, wherein the first detector comprises a two dimensional array of pixels for generating a two dimensional map of radiation intensity, and at least one second detector arranged to detect a position of each leaf of the plurality of leaves.