Injectable Polymer Gel Dosimeter for Real-Time Radiation Feedback
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Solution Overview
Problem
Existing radiotherapy treatments face challenges in accurately delivering radiation to disease sites while minimizing damage to healthy tissues due to the lack of effective dosimetric compositions for evaluating radiation delivery.
Innovation Solution
Development of an injectable dosimeter composition comprising a polymer gel with a radiation dosimeter material that generates a dosimetric signal in response to radiation, which is biocompatible and can be detected by MRI or optical imaging, allowing for real-time adjustment of radiation patterns and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radiotherapy is administered without dosimetric evaluation, then treatment can be delivered, but accurate delivery to disease site and precise dosage control cannot be ensured
Solution Approach 1:
The patent introduces a polymer gel dosimeter as an intermediary material that is injected into the disease site. This gel contains radiation-sensitive components that convert radiation exposure into measurable signals (optical absorption changes, ESR signals). The gel acts as a mediator between the radiation beam and the detection system, enabling precise dosimetric evaluation without interfering with the therapeutic effect on surrounding tissues.
Solution Approach 2:
The patent replaces traditional mechanical or physical dosimetry methods with chemical and physical-chemical measurement approaches. Instead of using mechanical dosimeters or complex imaging systems, the invention utilizes chemical reactions within the polymer gel (radiation-induced polymerization, oxidation-reduction reactions) that produce measurable optical or magnetic resonance signals, providing a more accurate and integrated dosimetric evaluation.
2Reliability
If radiation is increased to ensure adequate treatment dosage, then treatment effectiveness improves, but damage to healthy tissue increases
Solution Approach 1:
The patent implements a feedback mechanism by injecting the polymer gel dosimeter into or near the disease site before radiation administration. The gel provides real-time or post-treatment dosimetric feedback through measurable signal changes that correlate with radiation dose distribution. This feedback enables clinicians to verify that the intended dosage was delivered accurately to the target while sparing healthy tissues, allowing for adjustment of treatment parameters in subsequent sessions.
Solution Approach 2:
The patent applies preliminary action by injecting the dosimeter gel into the disease site before radiation treatment begins. This pre-positioning of the dosimetric material allows for accurate mapping of the radiation dose distribution throughout the treatment course, enabling precise control and adjustment of radiation parameters to maximize tumor control while minimizing damage to surrounding healthy tissues.
3Ease of operation
If traditional dosimetric methods are used, then radiation delivery can be monitored, but real-time adjustment of radiation patterns and intensity is not possible
Solution Approach 1:
The polymer gel dosimeter provides measurable signals (optical density changes, ESR spectra) that can be quantified and correlated with radiation dose. This feedback mechanism enables clinicians to assess the actual dose distribution after treatment or between treatment fractions, allowing for real-time or near-real-time adjustment of radiation patterns and intensity to optimize treatment delivery and account for anatomical changes or patient movement.
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 injectable dosimeter enables precise radiation delivery by providing real-time dosimetric feedback, protecting healthy tissues and ensuring accurate dosage to treatment sites, with stability at body temperature for extended periods.
Implementation Method 1
the radiation dosimeter material comprises Fe (II), and wherein the radiation converts the Fe (II) to Fe (III)
Implementation Method 2
the polymer gel is crosslinked via a small molecule crosslinker, a reactive functional group attached to the polymer chain, a photo cross-linking group attached to the polymer chain, or an enzyme-catalyzed cross-linking reaction
Implementation Method 3
the dosimetric signal generated in response to the radiation is detectable by magnetic resonance imaging (MRI)
Data Source
AI summary
Described herein is a biocompatible injectable dosimeter. The injectable dosimeter comprises a polymer gel and a radiation dosimeter material distributed in the polymer gel. The dosimeter material in the injectable dosimeter, when radiated, generates a dosimetric signal, which can be used to evaluate the delivery of the radiation. Also described are methods of using the injectable dosimeter, such as to report radiation in real-time and to protect tissues adjacent to the disease sites being irradiated.