The
unique set of images produced as a result of your scan will be interpreted by
one of our neuroradiologists who is specially trained in MR interpretation. These results
will be directly communicated to your physician within 24 hours, at which time he/she
can discuss the results with you.
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Magnetic
Resonance Imaging (MRI):
MRI is an advanced, modern technology that
produces unparalleled, detailed pictures of the inside of the human body. MRI
detects subtle differences between healthy and diseased tissues that cannot be
visualized on a normal x-ray examination. By using a large magnet, radio waves
and a highly sophisticated computer, your doctor can see inside your body. MRI
is normally a non-invasive test. Sometime, however, an injected contrast material
is required.
Magnetic Resonance
Angiography (MRA) and Magnetic Resonance Venography (MRV):
This
procedure utilizes MRI technology to detect, diagnose and aid in the treatment
of stroke and blood vessel diseases. The procedure is painless and images can
be obtained without using any contrast material, although a special form of contrast
agent is often given to make the MRI images even clearer.
MRA/MRV scans use
a magnetic field and pulses of radio wave energy to provide detailed images of
arteries & veins. These images are evaluated for stenosis (abnormal narrowing),
aneurysms (vessel wall dilatations at risk of rupture), or venous thrombosis (the
formation of a clot within a vessel).
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Magnetic
Resonance Spectroscopy (MRS):
This is an MRI technique that is utilized
to measure the chemical composition of diseased tissue within the brain without
removing tissue or blood samples and without using dangerous radiation. MRS is
a unique imaging sequence ordered to complement standard MRI imaging to evaluate
damaged brain tissue under special circumstances. It uses the fact that different
chemicals vibrate at different frequencies (like a tuning fork) when stimulated
by a magnet. The MRI machine develops a graph displaying what chemicals are present
in the brain and in what amounts.
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Diffusion
Weighted Imaging (DWI) and Diffusion Tensor Imaging (DTI):
Diffusion
MRI measures the diffusion of water molecules in biological tissues. DWI is highly
sensitive to the changes that occur in many types of lesions/damage in the brain.
DWI enhancement can appear within 5-10 minutes of the onset of stroke symptoms
on an MRI scan and can remain for up to two weeks.
Diffusion Tensor Imaging
enables water molecule diffusion to be measured in multiple directions. This allows
for the development of brain maps of white matter fiber directions to examine
areas of neural degeneration and demyelination in diseases like Multiple Sclerosis.
Apparent
Diffusion Coefficient Mapping (ADC):
ADC Mapping is a functional
tool applied to a Diffusion Weighted MR image to help differentiate MRI artifacts
from real brain ischemic lesions/stroke. This function is a sensitive indicator
for staging and determining what brain tissue is still potentially salvageable
after an ischemic stroke.
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