radiology report

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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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

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