3D Phantom Angular Compensation for Dosimetry Accuracy
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Solution Overview
Problem
Current radiation dosimetry systems face challenges in achieving accurate and customizable 3D dosimetry measurements due to limitations in detector array technology, particularly the angular dependence of 2D detection arrays and the high cost of 3D detection systems, which can lead to inaccuracies and increased radiation exposure to healthy tissues during therapy.
Innovation Solution
A configurable 3D phantom system that allows for the use of available detector arrays, including 2D arrays, with an angular-compensation system and detector-angle adjustment, enabling accurate 3D dosimetry information acquisition while compensating for angular dependence and providing flexibility without increasing system complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 2D detector arrays are used for radiation dosimetry, then system cost is reduced, but measurement precision deteriorates due to angular dependence
Solution Approach 1:
The patent transforms 2D detector array measurements into 3D dosimetry information by rotating the detector array to multiple angular positions and synthesizing the data. This dimensional transformation allows 2D arrays to achieve 3D measurement capabilities, resolving the contradiction between using simpler 2D arrays and achieving accurate 3D dosimetry.
Solution Approach 2:
The patent introduces dynamic rotation of the detector array to multiple angular positions during measurement. This dynamic approach allows the system to compensate for angular dependence by collecting data from multiple orientations, thereby maintaining measurement precision while using cost-effective 2D arrays.
2Measurement precision
If 3D detection systems are used for radiation dosimetry, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the measurement process into multiple angular positions, with the 2D detector array being rotated to different orientations. This segmentation allows the system to achieve 3D measurement precision through multiple 2D measurements, avoiding the need for complex 3D detector arrays while maintaining dosimetry accuracy.
Solution Approach 2:
The patent introduces a rotation mechanism and data synthesis algorithm as intermediaries between the simple 2D detector array and the required 3D dosimetry information. These intermediaries enable the transformation of 2D measurements into 3D data, achieving high precision without direct use of complex 3D detection systems.
3Productivity
If rotational therapy is implemented, then treatment effectiveness is improved, but dosimetry measurement accuracy deteriorates due to angular dependence of 2D arrays
Solution Approach 1:
The patent employs periodic rotation of the detector array to multiple angular positions during the measurement process. This periodic action allows the system to sample radiation dose from different angles, compensating for the angular dependence of 2D arrays and enabling accurate dosimetry verification for rotational therapy treatments.
Data Source
AI summary
A radiation dosimetry quality assurance system is disclosed that includes a three-dimensional (3D) phantom extending along a longitudinal axis to form an exterior surface and an interior volume and a passage formed to extend into the interior volume of the 3D phantom to removeably receive a detector array therein. The system also includes an angular-compensation system coupled to the exterior surface of the 3D phantom and having a physical contour extending from the exterior surface of the 3D phantom and configured to control an angular dependence of the detector array during measurement of the actual radiation dose delivered by the radiation delivery system. The system further includes a detector-angle adjustment system configured to allow selection of a relative position of the detector array with respect to a radiation source of the radiation delivery system during measurement of the actual radiation dose delivered during the planned medical process.