Multiple acquisition phase-sensitive SSFP for species...

Details Multiple acquisition phase-sensitive SSFP for species... Multiple acquisition phase-sensitive SSFP for species...

2007-03-06

2007-03-06

Arana, Louis M. (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

C324S309000

Reexamination Certificate

active

11225920

ABSTRACT:
MRI signals from two species such as fat and water are separated by repeatedly applying a steady state free precession (SSFP) sequence to an object with the phase of each RF excitation pulse in a sequence being increased by 2πn/N radians on each repetition, where acquisition number n ranges from 1 to N. Alternatively, center frequency for each scan is incremented compared with the first scan center frequency. Images are reconstructed from the acquired signals and summed. Slowing varying phase due to sources other than chemical shift can be removed. Species signals are separated based on phase (sign) of the summed image signals.

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Hargreaves et al., “Dual-Acquisition Phase-Sensitive Fat-Water Separation using Balanced SSFP”, 31 pages, unpublished, May 3, 2005.
Hargreaves et al., “Multiple-Acquisition Phase-Sensitive SSFP Water-Fat Separation”, Thirteenth Scientific Meeting, ISMRM, May 2005, p. 2385.

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