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MR Imaging of the Brain

MR Imaging of the Brain. Radiology 401. John R. Hesselink, M.D. MR System Components. Transmitter. Gradient Amplifier. RF Coil. Gradient. Computer. Gradient. RF Coil. Magnet. Receiver. Digitizer. Source of Signal and Contrast. Proton density T1 relaxation time T2 relaxation time

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MR Imaging of the Brain

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  1. MR Imaging of the Brain Radiology 401 John R. Hesselink, M.D.

  2. MR System Components Transmitter Gradient Amplifier RF Coil Gradient Computer Gradient RF Coil Magnet Receiver Digitizer

  3. Source of Signal and Contrast Proton density T1 relaxation time T2 relaxation time Flow effects MR Imaging

  4. RF TR TE Signal Spin-echo Pulse Sequence Single Echo T1-weighted 1st echo 2nd echo

  5. RF TR TE TE Signal Spin-echo Pulse Sequence Dual Echo T2-weighted 1st echo 2nd echo

  6. T2-Weighted Images

  7. Proton Density Weighted Images

  8. Normal FLAIR Images TR = 6000 msec, TI = 2000 msec, TE = 102 msec

  9. T1-Weighted Images

  10. MR Signal ofBrain Lesions

  11. T1W T2W Solid Brain Lesion PDW

  12. T1W Cystic Lesion FLAIR T2W 236

  13. Subacute Hemorrhage PDW T1W T2W

  14. T2W FLAIR Acute Hemorrhage T1W GRE

  15. History: 9 y/o boy with prior head trauma 466

  16. Hemorrhage Sequence Gradient-echo

  17. Fat or Lipoma T2W PDW T1W

  18. 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

  19. Acute Stroke Sequence Diffusion Weighted Imaging

  20. MR Angiography

  21. MR Spectroscopy Dx: Anaplastic astrocytoma > GBM

  22. Axial T2-weighted images Axial FLAIR images If normal: Stop If abnormal: T1-weighted images Gd-DTPA enhancement Brain Screening Protocol

  23. History: 46 y.o. man with headaches & increasing confusion 2 1 T2W PDW

  24. 4 3 T1W T1W 5 {Page 2} T1W / Gd

  25. Increasing confusion {Page 3} 6 7 Dx: Meningioma & right MCA infarct

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