Knife-Edge Collimator for Real-Time Gamma Ray Imaging in Ion Beam Therapy
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Solution Overview
Problem
Current radiation therapy using proton and ion beams lacks real-time capability to determine the dose deposited in organs, leading to potential overdoses and inaccuracies due to the limitations of existing monitoring techniques, such as PET imaging with longer decay times and low counting statistics.
Innovation Solution
A system incorporating a multi-slit knife-edge collimator and a position sensitive detector is used to image high-energy gamma rays with high position resolution and sensitivity, allowing for real-time monitoring of ion beam therapy by generating a two-dimensional image of gamma ray emissions and determining the position of the Bragg peak, which can be adjusted to minimize dose to sensitive tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PET imaging is used to monitor ion beam therapy, then radiation dose monitoring is enabled, but the decay time is long and counting statistics are low, preventing real-time monitoring
Solution Approach 1:
The patent changes the detection parameter from PET imaging (which measures positron annihilation photons with long decay times) to direct gamma ray detection from the ion beam interaction. This parameter change enables real-time monitoring by detecting gamma rays immediately produced during ion beam irradiation, eliminating the delay inherent in PET imaging's radioactive decay process.
2Measurement precision
If a collimator is used to improve gamma ray imaging resolution, then position resolution improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The collimator is segmented into multiple discrete slits arranged in a specific pattern rather than being a single complex structure. This segmentation allows each slit to be independently fabricated and positioned, simplifying the overall manufacturing process while achieving the desired imaging resolution through the collective effect of multiple simple elements.
Solution Approach 2:
The collimator employs composite construction combining lead or tungsten absorbing material with a structural support framework. This composite approach enables the collimator to achieve both the required gamma ray attenuation properties and mechanical strength, while allowing for modular fabrication and assembly, thereby reducing manufacturing complexity.
3Productivity
If high-energy gamma rays are detected with high position resolution, then real-time monitoring capability is achieved, but the device complexity increases due to collimator and detector requirements
Solution Approach 1:
The detection system is designed to serve multiple functions: it detects gamma rays for real-time monitoring, provides spatial information through the collimator geometry, and can be integrated with the existing ion beam therapy apparatus. This multi-functionality reduces the need for separate specialized components, thereby managing device complexity while achieving real-time monitoring capability.
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 system enables accurate, real-time monitoring and mapping of radiation doses during treatment sessions, improving the precision of radiation delivery and reducing the risk of accidents by providing immediate feedback for adjusting the ion beam, thus enhancing treatment planning and safety.
Implementation Method 1
position sensitive detector configured to detect gamma rays
Implementation Method 2
gamma rays generated by an ion beam interacting with a target
Implementation Method 3
collimator positioned between the target and the position sensitive detector
Implementation Method 4
gamma rays generated by an ion beam interacting with a target
Data Source
AI summary
This disclosure provides systems, methods, and apparatus related to ion beam therapy. In one aspect, a system includes a position sensitive detector and a collimator. The position sensitive detector configured to detect gamma rays generated by an ion beam interacting with a target. The collimator is positioned between the target and the position sensitive detector. The collimator includes a plurality of knife-edge slits, with a first knife-edge slit intersecting with a second knife-edge slit.