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Transcript of MRI
Invisible low energy state
Principles Behind MRI
Procession & Visibility
Free Induction Decay
Earth's Gravitational Field
Two Energy States
By James Barr
Intrinsic Angular Momentum
Apply a resonant torque:
Atomic nuclei in a magnetic field
Apply 90 and gradient fields
Scan through k-space
Measure induced voltage
Obtain spin density
Plot spin density against position
Growth in use
Gradient Coils (x,y,z)
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.