SLIDE 1
Kelly Beam Mark Bailly Danielle Allen Athena Turner Magnetic - - PowerPoint PPT Presentation
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
SLIDE 2
SLIDE 3
MRI History
- First Images were taken in the 1970s
- NMRI or MRI?
SLIDE 4
How does MRI work?
- Spinning Protons
Act Like Little Magnets
- They Align With An
External Magnetic Field (Bø)
SLIDE 5
How does MRI work?
*Based on ρ=111 for 12mM aqueous NiCl2 50 - 100 53 - 94 0.2 - 0.75 Adipose 45 - 90 20 - 67 0.95 - 1.82 Muscle 5 - 44 50 - 165 0.5 - 2.2 Meninges 85 - 125 61 - 109 1.09 - 2.15 Gray 70-90 61-100 0.76 - 1.08 White 70-230 110 - 2000 0.8 - 20 CSF ρ* T2 (ms) T1 (s) Tissue
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Questions ?
The End
SLIDE 8
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
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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
SLIDE 10
The Larmor Equation
- ω=γB
–Ω = Frequency of Angular Momentum
- Larmor Frequency
–γ = Represents the Gyromagnetic Ratio –B = Magnetic Field
Nucleus
Gyromagnetic Ratio (MHz / T)
1H
42.6
19F
40.1
23Na
11.3
13C
10.7
2H
6.5
17O
5.8
SLIDE 11
The Larmor Equation
SLIDE 12
Relation to Class
- Magnetic fields
–Static –Time-varying –Maxwell’s equations
- Gradients
–In relation to magnetic fields
SLIDE 13
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-