Radiation Measuring Device Dose Profile Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radiation measuring devices, such as multilayer ionization chambers, differ from water phantoms in measuring particle beam dose profiles, leading to inconsistencies in performance confirmation of particle beam therapy devices, requiring longer times for device adjustment and validation.
Innovation Solution
A radiation measuring device with a sensor unit, signal processing device, and main control device that includes multiple sensors and a correction mechanism to accurately calculate and correct dose profiles, reducing differences from water phantom measurements by using a plurality of sensor elements and a correction coefficient based on energy and depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multilayer ionization chamber is used to measure depth dose profile, then measurement time is reduced, but measurement precision differs from water phantom standard
Solution Approach 1:
The patent applies parameter changes by introducing correction coefficients that depend on beam energy and depth position. The main control device calculates correction coefficients based on the relationship between incident beam energy, depth in the detector, and measured dose values. These correction coefficients are then applied to adjust the dose profile measurements, transforming the raw data into corrected values that match water phantom standards while maintaining the fast measurement capability of the multilayer ionization chamber.
2Device complexity
If a multilayer ionization chamber is used for performance confirmation, then device complexity is reduced, but adaptability to different confirmation items is limited
Solution Approach 1:
The patent achieves universality by enabling the multilayer ionization chamber to perform multiple confirmation functions through software-based correction. The main control device can calculate and apply correction coefficients for various beam energies and depths, allowing the same physical detector to accurately measure different types of particle beam dose profiles. This makes the detector adaptable to various confirmation items including depth dose profiles, lateral dose distributions, and beam energy verification, replacing the need for multiple specialized detectors.
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 measurement of dose profiles with reduced time for performance confirmation of particle beam therapy devices, enhancing the applicability of multilayer ionization chambers to various confirmation items and improving the accuracy of device adjustments.
Implementation Method 1
sensor elements configured to generate charges in response to the particle beam
Data Source
AI summary
A radiation measuring device having a plurality of sensors configured to generate charges in response to the radiation includes a signal processing device. The signal processing device uses an signal generated by a proton beam irradiation device upon changing of beam energy and causes accumulation values of charges output from the sensors to be separately stored in a main control device for each value of the energy. The main control device calculates depth dose profiles for values of the beam energy from the accumulation values stored in the main control device and representing the charges. The main control device calculates a range of the beam for each of the values of the beam energy from the depth dose profiles, corrects the depth dose profiles for the values of the beam energy using a correction coefficient that depends on the range and sums the corrected depth dose profiles.