SSFP imaging technique with improved T1 contrast

Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G01R 3320

Patent

active

050557904

ABSTRACT:
A series of 90.degree. RF pulses (50) are applied, each in the presence of a slab or slice select gradient (52) to excite nuclear magnetic spins in the selected slab. The spins are phase encoded (56). A preliminary read gradient (60) of one polarity and a primary read gradient (62) of the opposite polarity are applied to induce a gradient echo (64) during the primary read gradient. After the primary read gradient, a residual magnetization dephasing gradient pulse (66, 66') is applied, with an alternating polarity from cycle to cycle. The residual magnetization dephasing pulse has an area defined by the product of its duration and amplitude which is selected relative to the area of the preliminary and primary read gradient pulses such that the residual magnetization does not refocus during collection of the gradient echo data in later cycles.

REFERENCES:
patent: 4449097 (1984-05-01), Young et al.
patent: 4665365 (1987-05-01), Glover et al.
patent: 4699148 (1987-10-01), Gyngell
patent: 4707653 (1987-11-01), Frahm et al.
patent: 4733186 (1988-03-01), Oppelt et al.
patent: 4769603 (1988-09-01), Oppelt et al.
patent: 4795973 (1989-01-01), Zur et al.
"Elimination of Transverse Coherences in Flash MRI" by Crawley et al., Mag. Res. in Med., 8, pp. 248-260, 1988.
"Optimization of Spoiler Gradients in Flash MRI" by Wood et al., Mag. Res. Imag., vol. 5, pp. 455-464, 1987.
"The Distinguishing Properties of Gradient-Recalled Acquisition in the Steady State (Grass)" by Wehrli et al., (one page).
"Diffusion and Field-Gradient Effects in NMR Fourier Spectroscopy" by R. Kaiser, E. Bartholdi and R. R. Ernst, Journal of Chem. Physics, vol. 60, No. 8, Apr. 15, 1974, pp. 2966-2979.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

SSFP imaging technique with improved T1 contrast does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with SSFP imaging technique with improved T1 contrast, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SSFP imaging technique with improved T1 contrast will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-259389

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.