Patent ID: 6172502
Filing Date: 2001-01-09
Classification: G01R

Abstract:
A method of forming a magnetic resonance image of a part of a body situated in a static magnetic field by use of a magnetic resonance signal generated by means of an excitation RF pulse and gradients, the method comprising the steps of:a. obtaining a measuring set of echo signal values by application of a read-out gradient in a first direction with an alternating polarity and further gradients on the static magnetic field and the simultaneous measurement of the generated magnetic resonance signal at measuring points along substantially parallel lines in k-space,b. determining a phase correction of the measuring set by measuring a reference set of echo signal values,c. determining an image by transformation and correction of phase errors by the measuring set of echo signal values,d. measuring a first and a second series of echo signal values of the reference set having opposite polarity of the read-out gradient at substantially corresponding instants relative to an instant at which phase errors due to frequency variations are zero, ande. deriving the phase correction from a first and a second echo signal value selected from the first and the second series of echo signal values, respectively, measured at said substantially corresponding instants.