Real-Time Neutron Beam Dose Control for Boron Neutron Capture Therapy
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Solution Overview
Problem
Conventional neutron capture therapy systems face challenges in accurately detecting and controlling the irradiation dose of neutron beams in real-time, leading to potential variations that may result in suboptimal treatment effectiveness and increased radiation damage to normal tissues.
Innovation Solution
A radiation detection system and method that incorporates a radiation detection device, such as an ionization chamber or scintillator detector, positioned downstream of the beam expander and upstream of the neutron generating unit, capable of real-time detection of neutron beams and γ-rays, with a control device that adjusts the charged particle beam and displays results to ensure accurate dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional neutron capture therapy systems use gold wire activation method for dose measurement, then the system can measure the neutron beam dose, but it cannot detect the irradiation dose in real time due to the delay in detaching and measuring the activated gold wire
Solution Approach 1:
The patent extracts the radiation detection function from the treatment beam path by placing a separate radiation detection device downstream of the beam expander and upstream of the neutron generating unit. This separate detection device monitors neutron beams and gamma rays in real-time without interfering with the therapeutic neutron beam delivery to patients.
Solution Approach 2:
The patent implements a feedback control system where the radiation detection device continuously monitors the neutron beam and gamma ray intensity, and the control device adjusts the charged particle beam parameters based on the detected radiation levels to maintain accurate dosing throughout the irradiation process.
2Reliability
If the neutron beam dose is not monitored in real time, then the system structure remains simple, but the irradiation dose accuracy varies due to dose rate changes during irradiation
Solution Approach 1:
The radiation detection device serves multiple functions: it detects neutron beam intensity, monitors gamma ray levels, provides real-time feedback for dose control, and enables verification of the actual irradiation dose delivered. This multi-functionality improves reliability without proportionally increasing system complexity.
Solution Approach 2:
The patent introduces a radiation detection device as an intermediary between the neutron generating unit and the treatment delivery system. This intermediary device indirectly monitors the therapeutic beam quality by detecting radiation in the beam path, providing accurate dose information without requiring direct measurement in the patient treatment path.
3Measurement precision
If radiation detection device is positioned downstream of beam expander and upstream of neutron generating unit, then real-time detection of neutron beam and gamma rays is enabled, but the device must withstand radiation exposure in the beam path
Solution Approach 1:
The radiation detection device is positioned upstream of the neutron generating unit in the beam line, allowing it to detect radiation before the full neutron beam is generated. This preliminary detection position enables real-time monitoring while exposing the detector to lower radiation doses compared to positioning it after the neutron target.
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
Enhances the accuracy of neutron beam irradiation dosing, allowing for precise control and minimizing radiation damage to normal tissues by enabling real-time monitoring and adjustment of the neutron beam intensity, thereby improving the effectiveness of neutron capture therapy.
Implementation Method 1
generating a neutron beam by means of a nuclear reaction with the charged particle beam
Implementation Method 2
detect the neutron beam overflowing from or γ ray generated by the neutron generating unit
Implementation Method 3
a radiation detection device, such as an ionization chamber or scintillator detector
Implementation Method 4
a radiation detection device, such as an ionization chamber or scintillator detector
Data Source
AI summary
Provided is a radiation detection system for improving the accuracy of a neutron beam irradiation dose for a neutron capture therapy system. The neutron capture therapy system includes a charged particle beam, a charged particle beam inlet for passing the charged particle beam, a neutron generating unit for generating the neutron beam by means of a nuclear reaction with the charged particle beam, a beam shaping assembly for adjusting flux and quality of the neutron beam, and a beam outlet adjoining to the beam shaping assembly, the radiation detection system includes a radiation detection device arranged within the beam shaper or outside the beam shaping assembly, the radiation detection device is used for real-time detection of the overflowing neutron beam by the neutron generating unit or the generated γ-ray after the nuclear reaction of the charged particle beam with the neutron generating unit.