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Published byEthelbert Benson Modified over 9 years ago
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Radiology 401 MR Imaging of the Brain John R. Hesselink, M.D.
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MR System Components Computer Magnet RF Coil Gradient Gradient RF Coil
Transmitter Gradient Amplifier RF Coil Gradient Computer Gradient RF Coil Magnet Receiver Digitizer
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Source of Signal and Contrast
MR Imaging Source of Signal and Contrast Proton density T1 relaxation time T2 relaxation time Flow effects
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Spin-echo Pulse Sequence
Single Echo T1-weighted RF Signal TR TE 1st echo 2nd echo
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Spin-echo Pulse Sequence
Dual Echo T2-weighted RF Signal TR TE 1st echo 2nd echo
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T2-Weighted Images
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Proton Density Weighted Images
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Normal FLAIR Images TR = 6000 msec, TI = 2000 msec, TE = 102 msec
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T1-Weighted Images
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MR Signal of Brain Lesions
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T1W T2W Solid Brain Lesion PDW
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T1W Cystic Lesion FLAIR T2W 236
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Subacute Hemorrhage PDW T1W T2W
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Acute Hemorrhage T2W FLAIR T1W GRE
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History: 9 y/o boy with prior head trauma
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Hemorrhage Sequence Gradient-echo
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Fat or Lipoma T2W PDW 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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Diffusion Weighted Imaging
Acute Stroke Sequence Diffusion Weighted Imaging
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MR Angiography
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MR Spectroscopy Dx: Anaplastic astrocytoma > GBM
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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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with headaches & increasing confusion
History: 46 y.o. man with headaches & increasing confusion 1 2 T2W PDW
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4 3 T1W T1W 5 {Page 2} T1W / Gd
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Increasing confusion {Page 3}
6 7 Dx: Meningioma & right MCA infarct
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