The main purpose of this study was to verify the feasibility of brain temperature mapping with high-spatial- and reduced-spectral-resolution magnetic resonance spectroscopic imaging (MRSI). A secondary goal was to determine the temperature coefficient of water chemical shift in the brain with and without internal spectral reference. The accuracy of the proposed MRSI method was verified using a water and vegetable oil phantom. Selective decrease of the brain temperature of pigs was induced by intranasal cooling. Temperature reductions between 2 degrees C and 4 degrees C were achieved within 20 min. The relative changes in temperature during the cooling process were monitored using MRSI. The reference temperature was measured with MR-compatible fiber-optic probes. Single-voxel (1)H MRS was used for measurement of absolute brain temperature at baseline and at the end of cooling. The temperature coefficient of the water chemical shift of brain tissue measured by MRSI without internal reference was -0.0192+/-0.0019 ppm/degrees C. The temperature coefficients of the water chemical shift relative to N-acetylaspartate, choline-containing compounds and creatine were -0.0096+/-0.0009, -0.0083+/-0.0007 and -0.0091+/-0.0011 ppm/degrees C, respectively. The results of this study indicate that MRSI with high spatial and reduced spectral resolutions is a reliable tool for monitoring long-term temperature changes in the brain.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.mri.2009.01.011 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Application of the Box-Behnken Design in the Development of Amorphous PVP K30-Phosphatidylcholine Dispersions for the Co-Delivery of Curcumin and Hesperetin Prepared by Hot-Melt Extrusion.
Pharmaceutics
December 2024
Department of Pharmacognosy and Biomaterials, Poznan University of Medical Sciences, 3 Rokietnicka St., 60-806 Poznan, Poland.
Curcumin and hesperetin are plant polyphenols known for their poor solubility. To address this limitation, we prepared amorphous PVP K30-phosphatidylcholine dispersions via hot-melt extrusion. This study aimed to evaluate the effects of the amounts of active ingredients and phosphatidylcholine, as well as the process temperature, on the performance of the dispersions.
View Article and Find Full Text PDFPhenolic Compounds and Pharmacological Potential of Extracts for the Treatment of Neurodegenerative Diseases.
Plants (Basel)
January 2025
Department of Pharmaceutical Chemistry, National University of Pharmacy, 61168 Kharkiv, Ukraine.
The search for neuroprotective compounds in lavender is driven by its traditional use for brain health, with antioxidant activity serving as a key mechanism in reducing oxidative stress and supporting cognitive function. Lavender's potential to protect neurons is based on its calming, anti-stress properties, which increase the brain's resistance to neurodegeneration. Although lavender is not a traditional medicinal plant in Ukraine, it is increasingly recognised for its medicinal properties and is widely cultivated in the country.
View Article and Find Full Text PDFAssessing Heat Resistance and Selecting Heat-Resistant Individuals of Largemouth Bass () with Tiered Thermal Exposure.
Animals (Basel)
January 2025
College of Fisheries, Southwest University, Chongqing 400715, China.
Largemouth bass (LMB, ), a commercially important farmed fish, is vulnerable to heat stress. Breeding heat-resistant LMB is highly desirable in the face of global warming. However, we still lack an efficient method to assess the heat resistance of LMB.
View Article and Find Full Text PDFPhysiological Responses to Aversive and Non-aversive Audiovisual, Audio, and Visual Stimuli.
Biol Psychol
January 2025
Department of Psychology, Institute for Mind and Brain, University of South Carolina, Columbia, SC 29201, USA. Electronic address:
We examined differences in physiological responses to aversive and non-aversive naturalistic audiovisual stimuli and their auditory and visual components within the same experiment. We recorded five physiological measures that have been shown to be sensitive to affect: electrocardiogram, electromyography (EMG) for zygomaticus major and corrugator supercilii muscles, electrodermal activity (EDA), and skin temperature. Valence and arousal ratings confirmed that aversive stimuli were more negative in valence and higher in arousal than non-aversive stimuli.
View Article and Find Full Text PDFThe Circulatory Arrest Recovery Ammonia Problem (CARAP) Hypothesis: a H-MRS study of brain metabolism during neonatal cardiopulmonary bypass surgery.
J Thorac Cardiovasc Surg
January 2025
Departments of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, CA 94305.
Objective: Congenital heart disease affects 1% of US births, with many babies requiring major cardiothoracic surgery under cardiopulmonary bypass (CPB), exposing the more critical patients to neurodevelopmental impairment. Optimal surgical parameters to minimize neuronal injury are unknown. We used H MRS and blood ammonia assays in a neonatal pig model of CPB to compare two approaches, complete circulatory arrest (CA) versus antegrade cerebral perfusion (ACP).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!