Bragg Peak Detector Using Scintillators for Real-Time Beam Monitoring
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Solution Overview
Problem
Conventional radiation therapy using particle beams, such as protons, lacks real-time detection capabilities for the position and intensity of the treatment beam during therapy, leading to potential inaccuracies and reduced effectiveness due to high background radiation and the inability to detect the beam after it passes through the patient.
Innovation Solution
A real-time Bragg peak detector system comprising an emitter, a pair of scintillator and photosensor stacks, and a coincidence detection circuit to determine the endpoint of the particle beam by detecting back-to-back gamma radiation, allowing for accurate in vivo and in situ monitoring of the particle beam's position and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate proton beam (test beam) is used to detect beam position and intensity, then detection capability is provided, but real-time detection of the treatment beam is impossible
Solution Approach 1:
The patent introduces an intermediary substance (e.g., positron-emitting isotope or converter material) that transforms the invisible charged particle beam into detectable electromagnetic radiation. This mediator enables indirect real-time detection of the treatment beam's position and intensity without requiring a separate test beam, resolving the contradiction between detection capability and real-time monitoring.
2Reliability
If conventional detectors are used in high background radiation environment, then detection of charged particles is possible, but detection accuracy deteriorates due to high background x-rays and gamma rays
Solution Approach 1:
The patent exploits the fundamental difference in interaction mechanisms between charged particles and electromagnetic radiation with the detector material. By using scintillators or semiconductor detectors with specific atomic numbers and densities, the system preferentially detects charged particles while being relatively insensitive to background x-rays and gamma rays, effectively filtering the signal from noise through material selection rather than active discrimination.
Solution Approach 2:
The patent changes the detection parameter from direct charged particle detection (which suffers from background interference) to electromagnetic radiation detection following nuclear reactions. By detecting annihilation photons or characteristic x-rays produced by nuclear reactions with the intermediary substance, the system achieves high signal-to-noise ratio because these secondary photons have distinct energy signatures that can be discriminated from background radiation.
3Reliability
If particle beam therapy is used to treat cancer, then treatment effectiveness is improved for difficult-to-treat tumors, but real-time verification of beam delivery is not possible
Solution Approach 1:
The patent implements a feedback system where the detector provides real-time information about beam position and intensity during treatment. This feedback enables verification that the beam is delivered to the intended target with correct parameters, allowing for immediate correction if deviations occur, thus maintaining treatment effectiveness while eliminating the information loss about actual beam delivery.
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
Enables precise, real-time detection of the particle beam's endpoint during therapy, improving treatment accuracy and effectiveness by minimizing the impact of high background radiation and overcoming limitations of conventional detectors.
Implementation Method 1
a first detection module comprising a stack of first scintillators and first photosensors respectively connected to the first scintillators and configured to detect the electromagnetic radiation and convert into a first signal
Implementation Method 2
first photosensors respectively connected to the first scintillators and configured to detect the electromagnetic radiation and convert into a first signal
Data Source
AI summary
Provided is a real-time detector of a Bragg peak, comprising: an emitter configured to emit a particle beam toward a target region in a first direction, thereby creating emission of electromagnetic radiation in the target region; a first detection module comprising a stack of first scintillators and first photosensors respectively connected to the first scintillators and configured to detect the electromagnetic radiation and convert into a first signal; a second detection module comprising a stack of second scintillators and second photosensors respectively connected to the second scintillators and configured to detect the electromagnetic radiation and convert into a second signal; and a coincidence detection circuit configured to determine an end point of the particle beam with respect to the first direction based on the first signal and the second signal.