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A method for correcting artifacts in magnetic resonance imaging which were caused by slowly oscillating shields is provided.
English (United States)
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Correcting Artifacts in Magnetic Resonance Imaging Due to Magnetic
Fields Caused by Slowly Oscillating Shields
A method for correcting artifacts in magnetic resonance imaging
which were caused by slowly oscillating shields is provided. The
method generally comprises:
a) conducting a preliminary scan through K space by providing
initial pulse and measuring at three points in time, and
applying a spin-echo refocusing pulse and measuring while
voltage of the magnetic resonance imaging apparatus is
according to Myt, where M is a gradient along the y direc
b) from the measured values, obtaining a function Dµ which is
Fourier transform of the density function on the imaged
c) conducting a magnetic resonance scan where, during the
encoding stage of each scan the phase of the signal is
observed at the three points in time corresponding to the
three points of the preliminary scan, and from the three
values, the amplitude and frequency of the interfering
oscillations are determined, and during the observation
after a spin-echo pulse, the output is modulated by a phase
function which is obtained directly from the amplitude and
frequency of the interfering oscillations; and
d) collecting free induction decay information and constructing
an image according to known techniques. The provided
technique eliminates ghosts in images which can appear when the
building which shields the magnetic resonance image scanner from
outside stray magnetic fields resonates and creates time-varying
interference. Turning to the figure, a pulse gradient sequence for a
preliminary scan which is to be conducted is set forth. At 10, an
initial excitation pulse is applied, and measurements 20 are obtained
at time 0, t0/2, and t0 . During the measurement time, the induced...