Awake Unrestrained Mri
Awake Unrestrained Mri - Related Videos
07:59
Training Dogs for Awake, Unrestrained Functional Magnetic Resonance Imaging
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Cited by 16 •
2019
Magnetic resonance imaging (MRI) on unrestrained awake dogs is a new method with several advantages over imaging with physical or chemical restraint. This protocol introduces a cost-effective training method that minimizes training in the MRI environment, which can be expensive, and maximizes the subject pool available for canine functional MRI.
08:51
Measuring Respiratory Function in Mice Using Unrestrained Whole-body Plethysmography
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Cited by 70 •
2014
The assessment of respiratory physiology has traditionally relied upon techniques, which require restraint or sedation of the animal. Unrestrained whole-body plethysmography, however, provides precise, non-invasive, quantitative analysis of respiratory physiology in animal models. In addition, the technique allows repeated respiratory assessment of mice allowing for longitudinal studies.
11:10
Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice
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Cited by 150 •
2011
The hyperinsulinemic-euglycemic clamp, or insulin clamp, is the gold standard for assessing insulin action in vivo. A method for performing insulin clamps in mice is described. This includes a method for arterial catheterization that permits experiments to be performed in conscious, unrestrained mice with minimal stress.
10:07
Thermal Imaging to Study Stress Non-invasively in Unrestrained Birds
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Cited by 55 •
2015
There is a need for a non-invasive assessment of stress. This paper describes a simple protocol using thermal imaging to detect a significant response in eye-region temperature in wild blue tits to a mild acute stressor.
06:06
Optogenetic Functional MRI
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Cited by 15 •
2016
This protocol describes the steps and data analysis required to successfully perform optogenetic functional magnetic resonance imaging (ofMRI). ofMRI is a novel technique that combines high-field fMRI readout with optogenetic stimulation, allowing for cell type-specific mapping of functional neural circuits and their dynamics across the whole living brain.
FAQs
Image formation depends on two linked processes: radiofrequency pulses perturb nuclear spins, and the scanner records their relaxation signals. Spatial encoding assigns those signals to locations, allowing the resulting measurements to represent brain structure rather than an undifferentiated whole-head response. This physical chain explains why both tissue-related signal behavior and subject movement affect the usefulness of the final images.
The main scientific advantage of the awake condition is behavioral relevance. Wakeful scanning can preserve neural activity associated with conscious sensory processing and ongoing interactions, providing measurements under more natural conditions. This makes the technique valuable when researchers want to relate brain structure, functional connectivity, or sensory responses to behavior rather than studying brain signals separately from normal behavioral states.
Movement is a central constraint because physical displacement can introduce artifacts into spatially detailed images and obscure genuine neural patterns. Awake Unrestrained MRI therefore combines habituation, motion control, and rapid imaging sequences. These measures do not eliminate the need for careful acquisition, but they can reduce movement-related distortion enough to retain useful information while the subject remains conscious and unrestrained.
Preparation centers on careful habituation, which helps subjects become familiar with the scanning situation before or during data collection. Researchers also plan motion-control measures and select rapid imaging sequences suited to wakeful acquisition. Together, these steps address the practical challenge of collecting spatially informative brain images without relying on anesthesia or physical immobilization.
Behavioral researchers can apply this approach to questions involving brain structure, functional connectivity, sensory processing, and behavior. Its value is greatest when the study requires neural measurements that remain relevant to conscious responses or interactions. By preserving wakeful activity while managing motion, the method can connect imaging findings more directly with the behavioral conditions being examined.
The resulting scans can provide information about brain structure as well as functional connectivity, which concerns coordinated activity between brain areas. They can also support analysis of sensory processing and its relationship to behavior. The combination of these outcomes allows researchers to examine both anatomical features and neural organization under conditions that more closely reflect natural wakeful responses.