Correction for field variation in steady-state MRI by repeated a

Details Correction for field variation in steady-state MRI by repeated a Correction for field variation in steady-state MRI by repeated a

1996-03-25

1997-07-29

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, G01V 300

Patent

active

056525141

ABSTRACT:
Methods and apparatus for correcting image artefacts caused by variations in the main magnetic field of an MRI system are disclosed, particularly for MRI with steady-state spin precession. For field correction in MRI with steady-state spin precession, the effects of the field changes can be corrected by quantifying the time course of the field drifts by repeated acquisition of the zero k-space lines. The change in the phase between consecutive zero k-space lines is used as an indicator of field variation and for correction of associated image artifacts. By using for field correction the zero k-space lines acquired using the imaging sequence itself, the steady-states of spin precession are undisturbed throughout the MRI data acquisition.

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