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Kelly Beam Mark Bailly Danielle Allen Athena Turner Magnetic - PowerPoint PPT Presentation

Kelly Beam Mark Bailly Danielle Allen Athena Turner Magnetic Resonance Imaging Greg Pawlowski Ryan Yaniga Joseph Sisson MRI History First Images were taken in the 1970s NMRI or MRI? How does MRI work? Spinning Protons They


  1. Kelly Beam Mark Bailly Danielle Allen Athena Turner

  2. Magnetic Resonance Imaging Greg Pawlowski Ryan Yaniga Joseph Sisson

  3. MRI History • First Images were taken in the 1970s • NMRI or MRI?

  4. How does MRI work? • Spinning Protons • They Align With An Act Like Little External Magnetic Magnets Field (Bø)

  5. How does MRI work? ρ * T 1 (s) T 2 (ms) Tissue CSF 0.8 - 20 110 - 2000 70-230 White 0.76 - 1.08 61-100 70-90 Gray 1.09 - 2.15 61 - 109 85 - 125 Meninges 0.5 - 2.2 50 - 165 5 - 44 Muscle 0.95 - 1.82 20 - 67 45 - 90 Adipose 0.2 - 0.75 53 - 94 50 - 100 *Based on ρ =111 for 12mM aqueous NiCl 2

  6. Questions ? The End

  7. History • 1946 – Felix Bloch and Edward Purcell • 1973 – Paul Lauterbur • 1975 – Richard Ernst • 1977 – Peter Mansfield and Andrew Maudsley • 1977 – Raymond Damadian • 1980 – FONAR Corporation

  8. How it Works • Magnetic Resonance Imaging (MRI) • Intense Magnetic Field • Second Electromagnetic Field • Oscillated, Specific Radio Frequencies • Perpendicular Alignment of Atoms • After Second Field is Turned Off • Atoms in the Body

  9. The Larmor Equation • ω = γ B – Ω = Frequency of Angular Momentum • Larmor Frequency – γ = Represents the Gyromagnetic Ratio –B = Magnetic Field Gyromagnetic Ratio (MHz / Nucleus T) 1 H 42.6 19 F 40.1 23 Na 11.3 13 C 10.7 2 H 6.5 17 O 5.8

  10. The Larmor Equation

  11. Relation to Class • Magnetic fields –Static –Time-varying –Maxwell’s equations • Gradients –In relation to magnetic fields

  12. References • Magnetic Resonance Imaging –Stwart C. Bushong • MRI for Technologist – Peggy Woodward / Roger Freimarck • http://en.wikipedia.org/wiki/Magnetic_reson ance_imaging • http://www.physics247.com/physics- tutorial/electromagnetism-mri.shtml

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