Fast spin echo prescan for MRI system

Details Fast spin echo prescan for MRI system Fast spin echo prescan for MRI system

1993-07-15

1995-01-03

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

053789857

ABSTRACT:
A prescan process for a MR fast spin echo (FSE) pulse sequence (FIG. 2 ) adjusts the phases of the RF excitation pulse and RF refocusing pulses and the value of the readout gradient dephaser pulse to reduce zero order phase shifts along all axes and first order phase shifts along the slice select and readout gradient axes due to eddy currents. Another aspect of the invention is the calculation during the prescan of adjustments to receiver phase and adjustments to readout gradients which further reduce image artifacts due to phase errors produced during the FSE scan.

REFERENCES:
patent: 4870361 (1989-09-01), In Den Kleef et al.
patent: 4876507 (1989-10-01), Van Vaals
patent: 5184073 (1993-02-01), Takeuchi et al.
patent: 5226418 (1993-07-01), Bernstein et al.

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