Hybrid 2D Radiation Detector for Accurate High-Resolution Dosimetry
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Solution Overview
Problem
Current radiation detectors, such as ionization chambers and semiconductor detectors, suffer from limitations in spatial resolution and energy dependence, which affect the accuracy and precision of dose measurements in radiation therapy dosimetry, particularly in regions with high linear energy transfer like the Bragg peak.
Innovation Solution
A hybrid detector system comprising an ionization chamber detector and an additional detector, such as a semiconductor detector, aligned along the Z-axis, where the additional detector provides finer spatial resolution and compensates for energy dependence, with an intelligence module to calculate combined dose distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ionization chambers are used for dose measurement, then measurement accuracy is improved, but spatial resolution deteriorates
Solution Approach 1:
The patent combines an ionization chamber detector with a semiconductor detector in a hybrid configuration. The ionization chamber provides accurate dose measurement while the semiconductor detector provides fine spatial resolution. The two detectors are positioned at different locations relative to the radiation beam, with the semiconductor detector upstream and the ionization chamber downstream, allowing simultaneous acquisition of both high-precision dose data and high-resolution spatial data that are then correlated through image registration.
2Manufacturing precision
If semiconductor detectors are used for dose measurement, then spatial resolution is improved, but energy dependence increases
Solution Approach 1:
The ionization chamber acts as an intermediary reference detector with known, stable energy response characteristics. By comparing the semiconductor detector signals against the ionization chamber measurements, the system can correct for energy dependence effects in the semiconductor detector. The ionization chamber provides a stable reference that is less sensitive to energy variations, allowing the high-resolution semiconductor data to be calibrated and corrected for energy-related inaccuracies.
3Measurement precision
If additional detectors are added to improve spatial resolution, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection system is segmented into two functionally distinct detector components: a semiconductor detector segment for capturing high-resolution spatial information upstream, and an ionization chamber segment for providing accurate dose measurement downstream. Each segment is optimized for its specific function, and the segmentation allows independent optimization of each detector type without requiring a single complex detector to perform all functions simultaneously.
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 hybrid detector system achieves high accuracy, precision, and reliability in dose measurements with improved spatial resolution, reducing the impact of quenching effects and providing reliable dose distributions across varying radiation conditions.
Implementation Method 1
The fluid is ionized by the radiation (5) traversing the ionization chamber (ICi) forming charged ions
Implementation Method 2
In direct conversion detectors, the ionising radiation produces electron-hole pairs directly in the semiconductor
Implementation Method 3
Indirect conversion detectors include scintillating detectors, comprising a scintillation layer that converts the ionizing radiation into optical photons, converted into electrical charges by photodetectors
Data Source
AI summary
The invention relates to a detector (1) for characterizing a dosimetry of a radiation. The detector includes an ionizing detector (1IC) configured for characterizing a dosimetry of a radiation beam (5) propagating along a Z-axis, the ionizing detector (1IC) comprising a matrix of ionisation chambers (ICi) distributed over a plane (X,Y) normal to the Z-axis, wherein the ionizing detector has a first spatial resolution over the plane (X, Y); an additional detector (1A) different from the ionizing detector (1IC) and having a second spatial resolution over the plane (X, Y) higher than the first spatial resolution over the plane (X, Y) of the ionizing detector and is positioned in series along the Z-axis relative to the ionizing detector (1IC); and an intelligence (10) configured to calculate a distribution of calculated doses (Dij) from the doses (DICi) measured by the ionizing detector (1IC) and the doses (DAij, DA0j) measured by the additional detector (1A).