Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

MRI

No description
by

James Barr

on 11 December 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of MRI

Procession & Visibility
Invisible low energy state
Nuclear Spin
Principles Behind MRI
MRI
Bike Wheel
Nuclear Spin
Hydrogen
Procession & Visibility
Free Induction Decay
Frequency Encoding
More Dimensions
Free Induction
Decay
Induced Voltage
Decay Rate
Homogeneous Field
Shimming
Spin Echo


Earth's Gravitational Field
Procession
Resonant Torque
Resonant Frequency
Normal
Amplitude Decays
Two Energy States
Bike Wheel
By James Barr
Boltzmann Statics
Large Numbers
Intrinsic Angular Momentum
Larmor Frequency
Apply a resonant torque:
Resonant frequency
Normal
90 Pulse
0
Example
Spin Echo
Frequency
Encoding
Gradient Coil
Larmor Frequency


Helix Tightens


Phase
More
Dimensions
Conclusion
In general:
Atomic nuclei in a magnetic field
Apply 90 and gradient fields
Scan through k-space
Measure induced voltage
Fourier transform
Obtain spin density
Plot spin density against position
MRI:
Growth in use
Nobel Prize!

Gradient Coils (x,y,z)
Vectorized

Resources
1.V. Bargmann et al., “Precession of the Polarization of Particles Moving In a Homogeneous Electromagnetic Field”, Physical Review Letters, Volume 2, Number 10, 15 May 1959. <http://prl.aps.org/pdf/PRL/v2/i10/p435_1>

2. M.Guerquin-Kern, “Wavelet-Based Reconstruction for Magnetic Resonance Imaging”, Web, Accessed 03 Dec 2013. <http://bigwww.epfl.ch/guerquin/thesis/index.html>

3. J. P. Hornak, “The Basics of MRI”, Web, Accessed 3 Dec 2013. <http://www.cis.rit.edu/htbooks/mri/>

4. P. Callaghan, “Introductory NMR & MRI”, Magritek, Web Video, Accessed 3 Dec 2013. < http://www.magritek.com/support-videos>

5. W. Forrest, "7T MRI helps predict multiple sclerosis in uncertain cases", Web, Accessed 11 Dec 2013 <http://www.auntminnie.com/index.aspx?sec=sup_n&sub=mri&pag=dis&ItemID=99458>



Equation (1), V. Bargmann et al., “Precession of the Polarization of Particles Moving In a Homogeneous Electromagnetic Field”.

Equation (2), M.Guerquin-Kern, “Wavelet-Based Reconstruction for Magnetic Resonance Imaging"

Diagram adapted from P. Callaghan, “Introductory NMR & MRI”

Demonstration adopted from P. Callaghan, “Introductory NMR & MRI”
Principles described in J. P. Hornak, “The Basics of MRI”.

Diagram adapted and equations from from P. Callaghan, “Introductory NMR & MRI”
Data collected using the Earth's magnetic field Terranova Apparatus, James Barr & Thomas Hudson

Images obtained with 7 Tesla Magnet, W. Forrest.
0
Full transcript