Automatic Virtual Shimming for Robust Fat Suppression in Subtractionless First-Pass Peripheral Angiography
Holger Eggers 1 and Tim Leiner 2
Philips Research, Hamburg, Germany,
of Radiology, University Medical Center Utrecht,
To apply Dixon methods for background suppression in
first-pass peripheral angiography, the water-fat
separation has to be highly reliable over large field of
views. This is difficult to achieve in the lower legs,
because large main magnetic field offsets and gradients
occassionally arise from poor resonance frequency
determination or shimming. An approach based on virtual
shimming is proposed in the present work to
automatically compensate for such offsets and gradients.
It is shown to improve the robustness of the fat
suppression in subtractionless first-pass peripheral
angiography in demanding cases.
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