UCSD Musculoskeletal Radiology
MRI physics Lecture Series
This page was last updated on: 11/19/2014
|Mini Pathria and Brady Huang - brachial plexus||6-Nov|
|Jiang - Basic MR Physics||20-Nov|
|Scripps Ortho Conference||11-Dec|
|Jiang - Image Information||18-Dec|
|Jiang - Imaging Sequences||8-Jan|
|Scripps Ortho Conference||22-Jan|
|Nick S. lecture 4||29-Jan|
|No conference||19-Feb||IDJ Course in SD|
|Nick S. lecture 5||26-Feb|
|TBD||5-Mar||MSK Ultrasound Course in SD|
|Scripps Ortho Conference||19-Mar|
|Nick S. lecture 6||26-Mar|
|No conference||9-Apr||Resident Review Course in SD|
|TBD||16-Apr||AUR in New Orleans|
|TBD||23-Apr||ARRS in Toronto|
|Scripps Ortho Conference||30-Apr|
|Scripps Ortho Conference||11-Jun|
MRI Physics 2014-15
WHAT: MR PHYSICS, Nick Szeverenyi presenting
WHERE: UCSD Teleradiology Center, 8899 University Center Lane, Suite 370, San Diego, CA 92122
WHEN: Thursday, September 25, 2014 at 7:00am
For any questions or concerns, feel free to contact me or Dr. Luke Hiller (firstname.lastname@example.org) directly.
Jiang Du, Ph.D. (email@example.com)
Associate Professor in Residence, Department of Radiology
PHYSICS LECTURES 1-7 TO BE HELD IN TELERADIOLOGY CONFERENCE ROOM (7-8 AM) TO ALLOW TELERADIOLOGY ROTATION FELLOWS TO BEGIN PROMPTLY UPON COMPLETION OF THE LECTURE SERIES AT 8 AM.
ON JULY 27, AND AUGUST 11, THE PHYSICS LECTURES WILL REPLACE THE 7 AM VA CONFERENCE.
1. Basic Physics (July 27, 2011)
Resonance Phenomenon (criteria for generating magnetization, alignment of nuclear magnetic moments and formation of bulk magnetization, precession, signal generation and detection, the Larmor equation, the rotating frame of reference, spin tipping), T2 & T1 Relaxation (mechanisms responsible for spin dephasing, spin-spin interactions, signal decay, spin flips, regrowth of longitudinal magnetization, spin-lattice interactions, relaxation properties of various states of matter, effects of field strength on T1 and T2 relaxation), and the Spin Echo Phenomenon (spin dephasing, 180 degree refocusing, spin rephasing, the spin echo rf sequence, TE and TR sequence parameters and their effects on T1, T2, and density weighting)
2. Image Formation (August 1, 2011)
Slice Selection (slice selective rf pulse and slice selection gradient), Frequency Encoding (encoding position using different frequencies during signal readout), Phase Encoding (encoding position using different phases) and Pulse Sequence Timing Diagrams.
3. Imaging Sequences I (August 3, 2011)
Spin Echo Imaging (scan time determination, data acquisition for single slice imaging, interleaved data acquisition order for multi-slice imaging, dual echo spin echo imaging for simultaneously acquiring density- and T2-weighted images, effect of imaging parameters on CNR, SNR, scan time), Inversion Recovery Imaging (inversion pulse, signal differences based on different T1 regrowth rates, signal nulling), Gradient Echo Imaging (eliminating the 180 degree pulse and its effects on data acquisition and image quality, properties of gradient echo sequences, small tip angle imaging, the gradient echo, examples of gradient echo imaging), and Echo Planar Imaging (the pulse sequence, example of reduced motion sensitivity, examples including functional and diffusion-weighted imaging).
4. Imaging Sequences II (August 5, 2011)
Gradient Echo Imaging, Sequence design, elimination of refocusing pulse, shorter TE, shorter TR, reduced tip angle, sensitive to signal loss caused by magnetic field inhomogeneities/susceptibility, susceptible to signal saturation, spoiled versus non-spoiled methods, fat and water in and out of phase, chemical shift artifact of the second kind, modified contrast using fat saturation, magnetization transfer, inversion recovery, and driven equilibrium, applications include fast scanning of dynamic processes, cardiac imaging, vascular imaging, etc.
5. Imaging Sequences III (August 10, 2011)
Fast Spin Echo (FSE) imaging and variants (Dual Echo split the echo train to get density-weighted information early and T2-weighted information late in the train, pros and cons; FRFSE fast recovery fast spin echo use an additional 90 degree rf pulse to tip the residual transverse magnetization longitudinal so you dont have to wait for regrowth of longitudinal magnetization, shorter TR, heavier T2 weighting; IRFSE inversion recovery FSE used to add T1 weighting; FLAIR fluid attenuated inversion recovery inversion recovery sequence with long TI to null the signal from CSF; SSFSE single shot fast spin echo long, compact echo train to sample all the information for an image in a single echo train; MRCP MR Cholangiopancreotography fast spin echo sequence with a very long TE to null signal from all tissues having T2s shorter than that those of fluids.)
6. Imaging Options (August 11, 2011)
Review of factors influencing the SNR of the image, Fractional NEX, Fractional Echo, Fractional FOV, No Phase Wrap, Chemical Saturation, Spatial Saturation, Magnetization Transfer, IR Prep, DE Prep, Slice ZIP, Read ZIP, Tailored RF, Variable Bandwidth, SPECIAL, Flow Compensation, Cardiac Triggering, parallel imaging, etc.
7. Artifacts and Remedies (August 17, 2011)
RF noise, motion, pulsatility, B0 field, phase wrap (aliasing), flow, gradient, signal over-range, susceptibility, chemical shift, saturation, intravoxel dephasing, etc.
Follow-up lectures (hot topics)dates to be determined:
8. Safety and Screening
Static Fields (biological effects, mechanical effects), varying Fields (induced currents, auditory damage, RF power deposition), and other issues (cryogens, claustrophobia, contrast agents)
9. Metal artifact reduction (VAT, SEMAC, MAVRIC, UTE, UTE-MSI )
10. Non-Cartesian imaging techniques (projection reconstruction, spiral, cone, propeller)
11. Ultrashort TE (UTE) morphological imaging
12. UTE quantitative imaging
13. T1rho imaging
14. T2 mapping
15. T1 mapping (dGEMRIC)
16. Proton density mapping (water content measurement, bound/free water measurement)
17. Diffusion weighted imaging (DWI)
18. Fat imaging, suppression, and quantification (IDEAL, spectroscopic imaging)
19. Magnetization transfer (MT)
20. Susceptibility weighted imaging (SWI)