MRI using variable imaging parameter(s) within a single image se

Details MRI using variable imaging parameter(s) within a single image se MRI using variable imaging parameter(s) within a single image se

1990-08-03

1993-04-13

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320, A61B 5055

Patent

active

052026329

ABSTRACT:
At least one imaging parameter (e.g., the repetition interval TR or the initial nutation angle .theta.) is varied during the course of a single MR image sequence. This variation in at least one imaging parameter is preferably controlled so as to increase the contrast and signal-to-noise ratio of lower spatial frequency image components. For example, by using longer TR intervals (or smaller initial nutation angle .theta.) during lower spatial frequency phase encoding sub-sequences, relatively more signal is gathered from NMR nuclei having long T1 parameters thus providing a resultant image with many characteristics of a much longer overall sequence (e.g., one using uniform relatively long TR intervals for all spatial frequency phase encoding sub-sequences).

REFERENCES:
patent: 4641095 (1987-02-01), Riederer
patent: 4698593 (1987-10-01), Croolls
patent: 4734646 (1988-03-01), Shenoy et al.
patent: 4837513 (1989-05-01), Yao
patent: 4986272 (1991-01-01), Riederer et al.
"Two-Dimensional Spectroscopy. Application to Nuclear Magnetic Resonance" by Aue et al., The Journal of Chemical Physics, vol. 64, No. 5, Mar. 1976 pp. 2229-2246.
"Reduction of MR Imaging Time by the Hybrid Fast-Scan Technique.sup.1 " by E. Mark Haacke, PhD et al., -Radiology 1986; pp. 158-529.
"Characteristics of Partial Flip Angle and Gradient Reversal MR Imaging.sup.1 " by Mark L. Winkler, MD et al.,-Radiology 1988; pp. 166; 17-26.
"Intra-Acquisition Modification of Pulse Sequence Parameters" by Farzaneh et al.,-SMRM Aug. 1989, p. 855.

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