Pulse sequence for a nuclear magnetic resonance apparatus

Details Pulse sequence for a nuclear magnetic resonance apparatus Pulse sequence for a nuclear magnetic resonance apparatus

1994-09-20

1995-07-11

O'Shea, Candra L.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3344

Patent

active

054324483

ABSTRACT:
A sequence of chronologically non-equidistant radio frequency excitation pulses and a first gradient are activated during an excitation phase. The existing spin magnetization is divided into sub-groups by each excitation pulse that follows the first excitation pulse. A chronologically graduated focusing of the individual sub-groups ensues during the read-out phase under a further gradient. A number of nuclear magnetic resonance signals can thereby be acquired following a single excitation phase, so that a short image pick-up time becomes possible, without the necessity of a fast switching of the gradients. Further, pure spin echoes can be acquired, which are insensitive to local field inhomogeneities in comparison to gradient echoes.

REFERENCES:
patent: 4818940 (1989-04-01), Hennig et al.
patent: 4847560 (1989-07-01), Sattin
patent: 4862082 (1989-08-01), Hennig
patent: 4891595 (1990-01-01), Granot
patent: 5126673 (1992-06-01), Hennig
patent: 5162730 (1992-11-01), Schmitt et al.
"Echoes--How to Generate, Recognize, Use or Avoid Them in MR-Imaging Sequences," Hennig, Concepts in Magnetic Resonance, vol. 3, 1991 (pp. 125-143).
"Clinical Applications and Methodological Developments of the Rare Technique," Hennig et al., Magnetic Resonance Imaging, vol. 6, pp. 391-395 (1988).
"Multiecho Imaging Sequences with Low Refocusing Flip Angles," Hennig, J. Mag. Res. vol. 78, pp. 397-407 (1988).

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