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Brain temperature measured by 1H-NMR in conjunction with a lanthanide complex
Hubert K F Trübel1, Paul K Maciejewski, Jacqueline H Farber
1Departments of Pediatrics, Magnetic Resonance Research Center, Yale University School of Medicine, New Haven, Connecticut 06510, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 11, 2003
Summary
Researchers developed a novel thulium-based sensor for noninvasively monitoring temperature and pH in rat brains using (1)H-NMR. This method offers a sensitive tool for in vivo brain studies, overcoming limitations of current techniques.
Area of Science:
- Neuroscience
- Biophysics
- Medical Imaging
Background:
- In vivo brain temperature data is limited due to the lack of noninvasive monitoring methods.
- Nuclear Magnetic Resonance (NMR) is a powerful noninvasive tool for studying brain activity.
- Accurate temperature monitoring is crucial for understanding brain function and disease.
Purpose of the Study:
- To develop and validate a noninvasive method for monitoring absolute temperature in the rat brain in vivo.
- To assess the capability of a thulium-based sensor for simultaneous temperature and pH measurement.
- To investigate the sensor's ability to cross the blood-brain barrier.
Main Methods:
- Utilized a thulium-based thermometric sensor infused via the bloodstream.
- Employed (1)H-NMR spectroscopy for absolute temperature monitoring in vivo.
- Validated temperature measurements against thermocouple wire data.
- Analyzed (1)H chemical shifts for simultaneous temperature and pH detection.
Main Results:
- Successfully monitored absolute temperature in the rat brain in vivo using the thulium sensor and (1)H-NMR.
- Demonstrated simultaneous, high-sensitivity measurement of both temperature and pH.
- Evidence suggests the sensor complex crosses the blood-brain barrier into the extracellular space.
- Measurements were validated by direct thermocouple temperature readings.
Conclusions:
- The thulium-based sensor provides a novel, noninvasive method for in vivo brain temperature and pH monitoring.
- This technique overcomes limitations of existing methods, offering high sensitivity and simultaneous measurement.
- Future applications include monitoring therapeutic responses and neuronal activity-induced changes in brain temperature and pH.