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magnetic resonance angiography (MRA)

Indications: 1) coronary MRA a) overall specificity 93%, sensitivity 42% (2002), b) for left main or 3-vessel disease: sensitivity 100%, specificity 85% [2] 2) non-invasive evaluation for carotid artery stenosis [3], thoracic & abdominal aortic aneurysm, renal artery stenosis, peripheral vascular disease of lower extremities is called 'run-off' Procedure: - time of flight (TOF) or phase contrast (more sensitive to flow) - magnetized protons moving into imaged field - sensitive to flow & turbulence - 3D requires stacked images - sensitive to movement - larger voxels, more flow artifacts - 3D field acquisition times long - gadolinium reduces acquisition time - artifact reduced by gadolinium

Related

magnetic resonance venography (MRA)

Specific

contrast-enhanced magnetic resonance angiography (CEMRA) magnetic resonance angiography (MRA) aorta magnetic resonance angiography (MRA) carotid & neck vessels magnetic resonance angiography abdomen magnetic resonance angiography celiac & superior mesenteric vessels magnetic resonance angiography chest magnetic resonance angiography extremity magnetic resonance angiography head & neck magnetic resonance angiography pelvis magnetic resonance angiography spinal cord

General

magnetic resonance imaging (MRI, diffusion-weighted MRI) angiography

References

  1. J Rapp, UCSF Fresno Invited Lecture, May 13, 1997
  2. Journal Watch 22(3):19, 2002 Kim WY et al Coronary magnetic resonance angiography for the detection of coronary stenoses. N Engl J Med 345:1863, 2001 PMID: 11756576
  3. Wardlaw JM et al, Non-invasive imaging compared with intra-arterial angiography in the diagnosis of symptomatic carotid stenosis: A metananalysis. Lancet 2006; 367:1503 PMID: 16679163
  4. Wikipedia: Magnetic resonance angiography http://en.wikipedia.org/wiki/Magnetic_Resonance_Angiography
  5. Medical Knowledge Self Assessment Program (MKSAP) 16 American College of Physicians, Philadelphia 2012