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Magnetic resonance thermometry during hyperthermia for human high-grade sarcoma
D L Carter1, J R MacFall, S T Clegg
1Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710, USA.
Summary
Magnetic resonance imaging (MRI) can noninvasively measure tumor temperature during hyperthermia treatment. This proton chemical shift imaging technique accurately tracks temperature changes, aiding treatment control.
Area of Science:
- Medical Imaging
- Oncology
- Biophysics
Background:
- Hyperthermia treatment requires precise temperature monitoring for efficacy and safety.
- Noninvasive temperature measurement methods are crucial for real-time feedback during thermal therapies.
Purpose of the Study:
- To assess the feasibility of using magnetic resonance imaging (MRI) for noninvasive temperature measurement during hyperthermia treatment of human tumors.
- To validate MR-based thermometry against invasive fiberoptic probes.
Main Methods:
- Phase-difference MRI utilizing the proton chemical shift was employed for temperature mapping.
- Four patients with lower extremity sarcoma underwent hyperthermia treatment concurrently with MR thermometry.
- Temperature data from MRI were correlated with invasive fiberoptic probe measurements in phantoms and human tumors.
Main Results:
- A strong linear correlation was observed between MRI-derived phase differences and temperature in phantoms (R² = 0.998).
- Human tumor measurements showed a significant correlation (R² = 0.84) after artifact exclusion.
- Corrected phase differences from MRI closely tracked fiberoptic probe temperatures during hyperthermia.
Conclusions:
- Proton chemical shift imaging is a feasible method for noninvasive temperature monitoring during hyperthermia.
- This technique can be used to monitor and control temperature in large tumors, particularly in the lower extremities.
- Current MRI and hyperthermia technology enables effective MR-guided thermal therapy.