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Clinical EPR: unique opportunities and some challenges.
Harold M Swartz1, Benjamin B Williams1, Bassem I Zaki2
1Department of Radiology, Geisel School of Medicine at Dartmouth, Dartmouth College, 48 Lafayette Street, Lebanon, NH 03766.
Academic Radiology
|January 21, 2014
Summary
Clinical electron paramagnetic resonance (EPR) systems now enable noninvasive tissue oxygen (oximetry) and radiation dose (dosimetry) measurements in humans. This breakthrough offers new avenues for personalized cancer therapy and disease management.
Area of Science:
- Biomedical Engineering
- Spectroscopy
- Medical Physics
Background:
- Electron paramagnetic resonance (EPR) spectroscopy is established for measuring free radicals and oxygen in biological systems.
- Clinical applications of EPR in humans face challenges like specialized instrumentation, probes, and regulatory hurdles.
Purpose of the Study:
- To describe the development of the first clinical EPR systems for human oximetry and dosimetry.
- To enable noninvasive tissue oxygen and radiation dose measurements in clinical settings.
Main Methods:
- Development of 1.2 GHz clinical EPR spectrometers with surface-loop resonators for topical measurements up to 1 cm depth.
- Utilizing oxygen-sensitive paramagnetic material (India ink) for noninvasive tissue pO2 monitoring.
- Measuring radiation-induced free radicals in teeth for EPR dosimetry in irradiated human subjects.
Main Results:
- Successful development of clinical EPR systems for human tissue oximetry and dosimetry.
- Demonstrated feasibility of noninvasive, repeated tissue oxygen measurements.
- Established capability for measuring radiation exposure dose via EPR dosimetry in teeth.
Conclusions:
- Clinical EPR systems offer significant potential for oximetry and dosimetry in human subjects.
- These advancements may guide patient therapy for tumors and vascular diseases through tissue oxygenation monitoring.
- Further development is ongoing to integrate this technology into routine clinical practice.
Keywords:
Electron paramagnetic resonancedosimetryfree radicalhyperoxygenationoxygenradiation therapytumor therapyMore Related Videos
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