Magnetic Resonance Imaging

Wikis > Imaging > Magnetic Resonance Imaging

http://sajr.org.za/index.php/sajr/article/viewFile/732/pdf_1

Give cross sectional representation of body part without ionising radiation. The patient is placed in a magnetic field – different tissue will resonate at different frequencies  these radiofrequency signals are picked up to create image.  high contrast crossectional views

Can provide insight into many foot and ankle conditions (especially soft tissue), but does require detailed understanding of the pathologies for interpretation by the radiologist.

Indications for MRI:
Avascular necroses; intramedullary tumours; soft tissue pathology; congenital anomolies; cartilage abnormalities; avascular necrosis

Advantages:
• can image any body plane
• high soft tissue contrast
• does not use ionising radiation

Disadvantages:
• CT better than MRI for small bone detail
• spatial resolution not as good as CT
• strict immobility during investigation is needed
• has contraindications
• high cost o equipment
• some problems with image artefact (eg in heart)

Contraindications:
Cardiac pacemakers; some aneurysm clips; cardiac valve prostheses; claustrophobia; first trimester of pregnancy; metallic implants

No biological hazards are known.

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