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Magnetic resonance angiography
(MRA) is a type of magnetic resonance imaging (MRI) scan that provides a picture
of blood vessels inside the body. MRA uses a magnetic field and pulses of
radio wave energy to produce these /images. In many cases, MRA can provide
information that cannot be obtained from X-ray tests.
For MRA, the area of the body being
studied is positioned inside a strong magnetic field. MRA can detect problems
with the blood vessels that may be causing reduced blood flow. With MRA, both
the blood flow and the condition of the blood vessel walls can be seen. The
test is often used to evaluate the blood vessels leading to the brain, kidneys,
and legs. Information from an MRA can be saved and stored on a computer for
further study. Photographs of selected views can also be made.
Contrast material is often used during MRA to
increase
the clarity of certain structures in the /images. While MRA is a safe and valuable
test for looking at blood vessels inside the body, it is expensive and not
always available outside of large cities and major medical centers.
Magnetic Resonance Angiography (MRA) Results
The radiologist may discuss preliminary
results of magnetic resonance angiography (MRA) with you right after the test.
Complete results are usually available in 1 to 2 days.
Magnetic resonance
angiography (MRA)
Normal:
The blood vessels appear
normal and the blood flow through them
is not reduced or stopped. No blood clots or significant plaque buildup is
seen.
Blood vessel walls are normal. No bulges (aneurysms)
in the walls
are seen.
Abnormal:
Partial or complete blockage of a
blood vessels may be seen.
Blockage may be caused by a blood clot, the buildup of fat and calcium deposits
(plaque), or narrowing (stenosis) of the blood vessel.
A bulge
(aneurysm) in the blood vessel wall may be seen. Damage
to the wall of a blood vessel may be seen.
Conventional angiography
may be
needed after MRA if a problem (such as an aneurysm) is present or if surgery
is being considered.
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