Developing in vivo EPR oximetry for clinical use

Area of Science:

• Biomedical Engineering
• Medical Physics
• Clinical Chemistry

Background:

• Clinical applications of electron paramagnetic resonance (EPR) oximetry require careful planning for feasibility and utility.
• Many principles for EPR oximetry can be adapted for other emerging clinical techniques.

Purpose of the Study:

• To describe the rationale and approaches for conducting EPR oximetry studies in human subjects.
• To outline steps for making EPR oximetry feasible and useful in a clinical setting.
• To focus initial applications on clinically significant problems lacking alternative solutions.

Main Methods:

• Utilizing EPR spectroscopy at 1.2 GHz for in vivo measurements.
• Employing non-invasive surface measurements (within 10 mm) or minimally invasive needle/catheter placement.
• Focusing on paramagnetic probes for localized oxygen tension (pO2) detection.

Main Results:

• EPR oximetry can be performed non-invasively or with minimal invasiveness.
• The technique allows for direct measurement of tissue pO2.
• Initial applications focus on guiding therapy for tumors and vascular diseases.

Conclusions:

• EPR oximetry presents a viable method for clinical use, particularly for tissue pO2 measurement.
• The approach emphasizes starting with simple, clinically useful applications before advancing to more complex ones.
• This technique offers a valuable, non-invasive alternative for managing conditions like cancer and vascular disease.