Radiology 401 MR Imaging of the Brain John R. Hesselink, M.D.
MR Imaging of the Brain
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Transcript of MR Imaging of the Brain
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Radiology 401
John R. Hesselink, M.D.
MR Imaging MR Imaging of the Brainof the Brain
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MR System Components
Computer
Gradient Amplifier
Receiver
Transmitter
Digitizer
RF Coil
Gra
dien
t
RF CoilG
radient
Magnet
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MR Imaging
Proton density
T1 relaxation time
T2 relaxation time
Flow effects
Source of Signal and Contrast
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Spin-echo Pulse SequenceSingle Echo T1-weighted
RF
Signal
TR
TE
1st
echo2nd
echo
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Spin-echo Pulse SequenceDual Echo T2-weighted
1st
echo2nd
echo
RF
Signal
TR
TETE
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T2-Weighted Images
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Proton Density Weighted Images
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Normal FLAIR ImagesTR = 6000 msec, TI = 2000 msec, TE = 102 msec
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T1-Weighted Images
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MR Signal ofMR Signal ofBrain LesionsBrain Lesions
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SolidBrainLesion PDW
T2W T1W
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CysticLesion
T2W
T1W
FLAIR
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SubacuteHemorrhage
PDW
T1W
T2W
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AcuteHemorrhage
T2W
FLAIR
T1WGRE
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History: 9 y/o boy with prior head trauma
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Hemorrhage SequenceGradient-echo
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PDW
Fator
Lipoma
T2W
T1W
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MR Signal Intensities
T2WI PD/FLAIR T1WI
Solid mass Bright Bright Dark
Cyst Bright Dark Dark
Subacute blood Bright Bright Bright
Acute & chronic blood Dark Dark Gray
Fat Dark Bright Bright
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Acute Stroke SequenceDiffusion Weighted Imaging
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MR Angiography
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Dx: Anaplastic astrocytoma > GBM
MR Spectroscopy
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Brain Screening Protocol
Axial T2-weighted images Axial FLAIR images If normal:
Stop If abnormal:
T1-weighted images Gd-DTPA enhancement
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History: 46 y.o. manwith headaches & increasing confusion
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T2W PDW
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T1W
T1W / Gd
T1W
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Dx: Meningioma & right MCA infarct
Increasing confusion {Page 3}
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