OFET Radiation Dosimeter Threshold Voltage Shift
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Solution Overview
Problem
Current radiation dosimeters face challenges in accurately measuring absorbed doses during radiation therapy due to uncertainties in dose distribution and patient positioning, leading to errors in radiation delivery to cancer cells while minimizing harm to healthy tissues.
Innovation Solution
Development of radiation dosimeters based on organic field-effect transistors (OFETs) that exhibit a shift in threshold voltage in response to radiation dose, allowing for direct and accurate measurement of radiation exposure at the site of interaction with the human body, utilizing organic semiconductors that are lightweight and conformal to the skin surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radiation dosimeters are used to measure absorbed dose, then dose distribution can be measured, but measurement precision is reduced due to uncertainties in dose distribution and patient positioning
Solution Approach 1:
The patent replaces traditional mechanical/cylindrical diode array dosimetry systems with organic field-effect transistor (OFET) based dosimeters that directly measure radiation dose through electrical threshold voltage shifts, eliminating the need for complex mechanical positioning and post-processing calculations
Solution Approach 2:
The patent utilizes the parameter change of threshold voltage in organic semiconductors in response to radiation exposure, where the threshold voltage shifts as a direct function of absorbed radiation dose, providing a linear and accurate measurement mechanism
2Reliability
If complex post-processing of EPID data is performed to estimate dose distribution, then beam placement can be verified, but measurement precision deteriorates due to inhomogeneities and anatomical variations
Solution Approach 1:
The patent replaces complex EPID-based image processing systems with direct electrical measurement using OFETs, substituting computational estimation with physical measurement that is independent of anatomical variations
Solution Approach 2:
The patent uses organic semiconductors that are conformal to the skin surface to create a direct copy of the radiation dose distribution at the treatment site, eliminating the need for indirect imaging and computational reconstruction
3Measurement precision
If cylindrical diode arrays in PMMA phantoms are used for dose measurement, then dose distribution can be measured a priori, but device complexity increases and measurement precision is limited by geometric and compositional differences
Solution Approach 1:
The patent extracts the dosimetry function from complex PMMA phantom systems with cylindrical diode arrays and implements it in simple, flexible organic semiconductor devices that can be directly applied to the patient
Solution Approach 2:
The patent changes the measurement parameter from physical geometry and material composition matching to direct electrical threshold voltage measurement, which is insensitive to geometric and compositional variations
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 OFET-based dosimeters provide high sensitivity and accuracy in measuring radiation doses, reducing the complexity and cost of treatment, and enabling precise radiation delivery with minimal impact on healthy tissues, while being robust and suitable for flexible substrates and various medical procedures.
Implementation Method 1
high-energy ionizing photon and electron radiation is used to destroy or reduce the growth of cancer cells
Implementation Method 2
organic field effect transistors having composition and/or electronic structure exhibiting a shift in threshold voltage as a function of radiation dose
Data Source
AI summary
In one aspect, radiation dosimeters are described herein comprising organic field effect transistors. Briefly, a radiation dosimeter comprises an organic field effect transistor having composition and/or electronic structure exhibiting a shift in threshold voltage as a function of radiation dose.