HDR Brachytherapy Needle Oxygen Mapping for Hypoxic Tumor Dosing
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Solution Overview
Problem
Current HDR brachytherapy treatments lack the ability to accurately measure and account for tumor oxygen levels, leading to inadequate treatment of hypoxic regions and reduced treatment efficacy due to resistance to radiation and other therapies.
Innovation Solution
Integration of a radio frequency micro-coil sensor and spin probe on HDR needles for real-time oxygen level mapping, combined with an L-band pulse electron paramagnetic resonance imaging system, enabling personalized treatment planning by targeting high doses to hypoxic areas and minimizing exposure to healthy tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HDR brachytherapy is used without oxygen measurement, then treatment delivery is simple and quick, but treatment efficacy is reduced due to inability to target hypoxic regions
Solution Approach 1:
The patent combines oxygen sensing capability with HDR brachytherapy delivery by integrating a spin probe and RF micro-coil sensor directly into the brachytherapy needle assembly. This merging allows simultaneous measurement of oxygen levels and delivery of radiation therapy through a single integrated device, resolving the contradiction between treatment efficacy and system complexity
Solution Approach 2:
The system implements real-time feedback by continuously monitoring oxygen levels during brachytherapy delivery and using this information to dynamically adjust treatment parameters. The processor receives oxygen level data from the sensor and modifies radiation delivery accordingly, ensuring hypoxic regions receive appropriate dosing while maintaining overall treatment efficacy
2Loss of information
If oxygen level mapping is performed throughout the tumor, then personalized treatment planning is enabled, but measurement time and processing complexity increase
Solution Approach 1:
The system performs preliminary oxygen level mapping before final treatment delivery, allowing treatment planning to be based on complete oxygen distribution data. By acquiring oxygen information in advance and generating a comprehensive map, the system enables personalized treatment planning without delaying the actual radiation delivery
Solution Approach 2:
The system dynamically adjusts the scanning process and data acquisition based on real-time oxygen level variations. The processor prioritizes mapping regions with significant hypoxic areas and adapts measurement resolution accordingly, reducing unnecessary measurements in uniformly oxygenated regions while maintaining accurate mapping of critical hypoxic zones
3Reliability
If high dose radiation is delivered to hypoxic regions, then tumor control is improved, but exposure to surrounding healthy tissues increases
Solution Approach 1:
The system applies local quality by delivering different radiation doses to different regions based on their oxygen levels. Hypoxic regions receive higher doses while well-oxygenated healthy tissues receive lower doses, achieving spatially varying treatment intensity that improves tumor control while protecting surrounding healthy tissues
Solution Approach 2:
The system replaces traditional mechanical dose distribution methods with oxygen-guided intelligent control. Instead of relying solely on physical distance from the radiation source to determine dose, the system uses real-time oxygen level data to dynamically adjust dosing, allowing precise targeting of hypoxic tumor regions while minimizing exposure to healthy tissues
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 oxygen level mapping and personalized treatment planning, significantly improving treatment outcomes by enhancing radiation delivery to hypoxic tumor regions and reducing exposure to surrounding tissues.
Implementation Method 1
oxygen guidance of high dose rate brachytherapy with electron paramagnetic resonance
Implementation Method 2
a spin probe mounted to an outer surface of the shaft of the needle
Data Source
AI summary
A system for mapping oxygen levels in tumors includes a needle that is sized to deliver high dose rate brachytherapy to tissue into which the needle is inserted, where the needle includes a radio frequency micro-coil sensor positioned within a shaft of the needle and a spin probe mounted to an outer surface of the shaft of the needle. A processor is in communication with the needle and configured to move the radio frequency micro-coil sensor along the shaft of the needle. The processor is also configured to receive, from the radio frequency micro-coil sensor, oxygen level readings at a plurality of tissue locations along the shaft of the needle. The processor is also configured to generate an oxygen level mapping of the tissue based on the oxygen level readings received from the radio frequency micro-coil sensor.