X-ray Detection Device with Energy Filter for Dose Measurement
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Solution Overview
Problem
Current X-ray detection devices face challenges with energy and angular dependency, particularly in CT dose measurements, due to asymmetrical response and incomplete measurement of primary radiation, which affects the accuracy of dose profile measurements.
Innovation Solution
An X-ray detection device with an energy filter comprising an attenuation member that attenuates low-energy X-rays more than high-energy X-rays, arranged to extend around the sensing member to subtend a working solid angle, featuring low-attenuation zones allowing both low- and high-energy X-rays to pass through to a similar extent, thereby reducing energy dependency and improving symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard ion chamber is used for dose measurement, then the measurement includes scattered radiation, but the measurement of primary radiation is incomplete due to beam collimation limitations
Solution Approach 1:
The detection device divides the sensing area into multiple segments (first detection area and second detection area) with different functions. The first detection area measures primary radiation while the second detection area measures scattered radiation, allowing complete dose measurement even with limited beam collimation coverage.
2Ease of manufacture
If a high Z material back contact is used in semiconductor detectors, then the detector structure is simplified, but the detector response becomes asymmetrical causing measurement errors
Solution Approach 1:
The invention removes the high Z material back contact from the detector structure and replaces it with a low Z material. This extraction of the problematic component eliminates the asymmetrical response while maintaining structural simplicity, enabling accurate dose measurements from both front and back contacts.
3Measurement precision
If conventional X-ray detectors are used without energy filtering, then the detector responds to all X-ray energies, but the energy dependency causes inaccurate dose measurements
Solution Approach 1:
The invention introduces an energy filter as an intermediary component between the X-ray source and the detector. This filter selectively attenuates different X-ray energies before they reach the detector, compensating for the detector's energy dependency and enabling accurate dose measurements across the full X-ray energy spectrum.
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 device achieves reduced energy and angular dependency, ensuring consistent energy response across various angles and energies, enhancing the accuracy of dose measurements and compliance with IEC standards, particularly in CT and CBCT applications.
Implementation Method 1
an energy filter comprising an attenuation member configured to attenuate low-energy X-rays to a greater extent than high-energy X-rays
Data Source
AI summary
The invention concerns an X-ray detection device comprising an X-ray sensing member and an X-ray energy filter comprising an attenuation member configured to attenuate low-energy X-rays to a greater extent than high-energy X-rays in a beam or field of X-radiation directed towards the X-ray sensing member. The invention is characterized in that the attenuation member is arranged to extend in a spatial manner at least partly around the X-ray sensing member so as to subtend at least a working solid angle in relation to the X-ray sensing member, wherein the attenuation member, at least over a working area corresponding to the working solid angle, is provided with a plurality of low-attenuation zones distributed over the working area of the attenuation member, wherein the low-attenuation zones are configured to attenuate X-rays only to a small or negligible extent so as to allow passage of both low-energy and high-energy X-rays to a substantially similar extent through the attenuation member towards the X-ray sensing member, wherein the low-attenuation zones are distributed in relation to the X-ray sensing member in such a way that, when the X-ray detection device is exposed to a beam or field of parallel X-radiation that is directed towards the X-ray sensing member within the working solid angle and that has a width that covers a projected area of the energy filter, only a first portion of a total surface of the X-ray sensing member facing the beam or field of X-radiation is directly exposed to low-attenuated X-rays that pass through the low-attenuation zones, whereas a second remaining portion of the total surface of the X-ray sensing member facing the beam or field of X-radiation is directly exposed only to X-rays that pass through the attenuation member, wherein the relation between i) the first portion of the total surface of the X-ray sensing member facing the beam or field of X-radiation and ii) said total surface of the X-ray sensing member facing the beam or field of X-radiation, is substantially constant irrespective of a spatial angle of incidence of the beam or field of X-radiation that falls within the working solid angle.