Automatic Gradient Delay Correction Using Center-Acquisition-at-Partial-Ramp Imaging (CAPRI)
Anna-Katinka Bracher 1 , Erich Hell 2 , Johannes Ulrici 2 , and Volker Rasche 1
Internal Medicine II, University Hospital of
Ulm, Ulm, BW, Germany,
Dental Systems, HE, Germany
Center-Out imaging sequences like UTE are very sensitive
to trajectory imprecision in waveform and to k-space
shift due to system delays. In this article an automatic
delay correction method is introduced to determinate the
delays by direct measurement of the echo peak shift.
Therefore a conventional UTE imaging sequence is
combined with an additional pre-phasing gradient to
shift k-space center along the rising slope of the
readout gradient. Furthermore the signal acquisition is
started in front of k-space origin to acquire a partial
echo for echo peak detection.
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