MR Imaging Introduction
Magnetic Resonance Imaging (MRI) exploits magnetic fields and radio waves to visualize internal structures without harmful radiation, unlike X-rays or CT scans.
The Physics Behind MRI
MRI centers on nuclear magnetic resonance. Hydrogen atoms align with a strong magnetic field; radiofrequency pulses then disturb this alignment, emitting signals that are converted into images.
Soft Tissue Contrast
MRI's strength lies in its superior soft tissue contrast. It distinguishes fine differences in tissue composition, making it invaluable for neurological, musculoskeletal, and cardiovascular imaging.
Functional MRI (fMRI)
Functional MRI maps brain activity by detecting changes in blood flow, offering insights into brain function and aiding in pre-surgical planning and research on neural diseases.
MRI Technology Advances
Technological innovations, such as ultra-high-field 7 Tesla MRI scanners, provide unprecedented image resolution, opening new possibilities in medical diagnosis and research.
MRI Safety Considerations
Despite MRI's non-invasive nature, safety concerns persist. Patients with certain implants, pacemakers, or metal fragments cannot undergo MRI due to the strong magnetic field.
MRI and Contrast Agents
Contrast agents, like gadolinium, enhance MRI scans by altering the magnetic properties of nearby water molecules, improving the visibility of certain tissues or abnormalities.
What does MRI utilize?
X-rays and radio waves
Magnetic fields and radio waves
Ultrasound and magnetic fields
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