Magnetic resonance angiography
A non-invasive imaging modality using magnetic resonance to visualize blood vessels without ionizing radiation or iodinated contrast.
Full Definition
Magnetic resonance angiography (MRA) employs magnetic resonance imaging principles to create detailed vascular images through various techniques including time-of-flight, phase-contrast, and contrast-enhanced methods. MRA avoids ionizing radiation and can be performed without contrast in patients with renal insufficiency, though gadolinium-enhanced studies provide superior image quality. It excels at evaluating carotid disease, renal artery stenosis, and peripheral arterial disease, though it may overestimate stenosis severity and has limitations in patients with metallic implants.
Usage
Usage note: Abbreviate as MRA after first use. Note contraindications such as pacemakers or metallic implants.
In Context
- "Magnetic resonance angiography demonstrated high-grade left internal carotid artery stenosis without requiring iodinated contrast." — Non-invasive vascular imaging
- "MRA was chosen over CTA due to the patient's chronic kidney disease and contrast allergy history." — Imaging selection rationale