Mri Scanning
Mri Scanning - Related Videos
01:30
Radiological Investigation II: MRI and Ventilation Perfusion Scan
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2024
Description Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures. MRI MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
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.
09:33
MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges
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Cited by 79 •
2014
Non-invasive imaging of the brain vasculature’s ability to dilate or constrict may allow a better understanding of cerebrovascular pathophysiology in various neurological diseases. The present report describes a reproducible and patient-comfortable protocol to perform vascular reactivity imaging in humans using magnetic resonance imaging (MRI).
08:20
MRI-guided dmPFC-rTMS as a Treatment for Treatment-resistant Major Depressive Disorder
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Cited by 31 •
2015
Here we outline the procedure for MRI-guided repetitive transcranial magnetic stimulation to the dorsomedial prefrontal cortex as an experimental treatment for major depressive disorder.
10:35
Simultaneous PET/MRI Imaging During Mouse Cerebral Hypoxia-ischemia
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Cited by 4 •
2015
The method presented here uses simultaneous positron emission tomography and magnetic resonance imaging. In the cerebral hypoxia-ischemia model, dynamic changes in diffusion and glucose metabolism occur during and after injury. The evolving and irreproducible damage in this model necessitates simultaneous acquisition if meaningful multi-modal imaging data are to be acquired.
FAQs
MRI contrast arises because hydrogen nuclei in different tissues return to equilibrium at different rates after radiofrequency excitation. These relaxation behaviors alter the signals detected from each region, while differences in water, fat, and other tissue composition further distinguish structures. The resulting contrast allows researchers to separate anatomical regions and examine changes in tissue properties.
Hydrogen nuclei provide the responsive signal because they are abundant in biological water and fat. A magnetic field aligns them, and a radiofrequency pulse changes that alignment. As they recover, they emit measurable signals that reflect their local tissue environment. This abundance enables MRI scanning to represent internal biology without requiring ionizing radiation.
Specialized MRI sequences adjust how the scan emphasizes signals produced during nuclear recovery. By highlighting particular aspects of anatomy or biological processes, they can reveal information that a general image may not show as clearly. In biology, this flexibility supports separate investigations of structure, development, disease progression, blood flow, and tissue function.
After radiofrequency excitation, returning hydrogen nuclei emit signals that are detected by the scanner. The system processes differences in those signals into spatially organized images, with tissue composition and relaxation behavior determining much of the visible contrast. This conversion from detected signal to image makes internal structures and biological changes available for analysis.
MRI scanning supports studies of brain structure, organismal development, disease progression, blood flow, and tissue function. Researchers can therefore examine both anatomy and selected biological processes in living organisms. The method is especially useful when investigations require detailed internal measurements rather than observations limited to external features or isolated tissues.
Because MRI scanning does not use ionizing radiation, researchers can use it to obtain repeated measurements in living organisms. Serial imaging can document changes across development or disease progression while preserving the ability to study the same organism over time. This longitudinal perspective helps relate structural findings to evolving biological conditions and function.