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8/14/2019 Radiology Report
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Imaging Techniques
Computed Tomography
Magnetic Resonance Imaging
Angiography
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CT scan
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CT scan of the patient
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CT scan of the patient
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Magnetic Resonance ImagingA procedure that uses a magnetic field
and pulses of radio wave energy to make
pictures of organs and structures insidethe body
Allows greater differentiation between the
gray and white matter T1 weighted images: CSF appears black, gray matter
gray, white matter white
T2 weighted images: CSF is white, white matter and
fat containing structures are darker
Hydrogen is the most common magneticresonance observable nucleus in the
human body and has the advantage of
being present in many different tissues in
different concentrationsT2 T1
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Mag etic Res a ce I agi g
Diffusion MRI
Is a eth d that pr duces in vivo images
of biological tissues weighted with thelocal microstructural characteristics of
water diffusion.
Signal attenuation is noted in areas of free
diffusion
This measurement is more sensitive toearly changes after a stroke than moretraditional MRI measurements such as T1
or T2 relaxation rates.
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Mag etic Res a ce I agi g
Proton Density MRI
A i age pr duced by
c tr lli g the selecti
f sca para eters t
i i ize the effects f T1a d T2, resulti g i a
i age depe de t
pri arily the de sity
f pr t s i the i agi g
v lu e.
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Magnetic Resonance ImagingGradie t ecall Ech
highest sensitivity in
detecting early hemorrhagic
changes
T2 FLAI I
FLAIR is a technique that
causes the CSF to be dark,making it easier to identify
abnormally bright areas of the
brain
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Magnetic Resonance ImagingPerf si -weighted imagi g(PWI)
It is based on passage of MRcontrast through brain
tissue which are
hemodynamically weighted
MR sequences
Spi de sityweighted imagi g
An MR imaging in which CSFhas a density similar to
brain tissue
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Magnetic Resonance Imaging
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MRI T1 Weighted Images
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MRI T1 Weighted Images
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MRI T1 Weighted Images
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MRI T1 Weighted Images
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MRI T1 Weighted Images
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MRI T2 Weighted Images
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MRI T2 Weighted Images
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C1 and C2
Foramen Magnum
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Cervicomedullary Junction
Hypoglossal nerve canal
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Brainstem
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Medulla
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Magnetic Resonance ImagingRight CA I farct
large territorial infarct in theright MCA distribution with
mild mass effect on the
right lateral ventricle
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Copyright 2009 by the American Roentgen Ray SocietyKim, H. S. et al. Am. J. Roentgenol. 2006;187:W650-W657
D
WI
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Angiography
Best parameter to document stroke
Can be performed using: x-rays with catheters
computed tomography (CT) magnetic resonance imaging (MRI)
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Angiography
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MR Angiography Be efits
A noninvasive imaging technique that does notrequire exposure to radiation
Detailed images of blood vessels and blood flow
are obtained Shorter than a traditional catheter angiogram and
requires no recovery period
Less costly than catheter angiography
MR angiography can provide high-quality imagesof many blood vessels
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Normal MR Angiogram
MR A i
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Copyright 2008 by the American Roentgen Ray SocietyKim, H. S. et al. Am. J. Roentgenol. 2006;187:W650-W657
MR Angiogram
Right MCA occlusion
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CT Angiography