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Gap Cycling for SWIFT | | Curtis A. Corum
; Djaudat Idiyatullin
; Carl J. Snyder
; Michael Garwood
; | | Date: |
10 Jul 2013 | | Abstract: | Purpose: SWIFT (SWeep Imaging with Fourier Transformation) is a non-
Cartesian MRI method with unique features and capabilities. In SWIFT,
radiofrequency (RF) excitation and reception are performed nearly
simultaneously, by rapidly switching between transmit and receive during a
frequency-swept RF pulse. Because both the transmitted pulse and data
acquisition are simultaneously amplitude-modulated in SWIFT (in contrast to
continuous RF excitation and uninterrupted data acquisition in more familiar
MRI sequences), crosstalk between different frequency bands occurs in the data.
This crosstalk leads to a "bulls-eye" artifact in SWIFT images. We present a
method to cancel this inter-band crosstalk by cycling the pulse and receive gap
positions relative to the un-gapped pulse shape. We call this strategy "gap
cycling."
Methods: We carry out theoretical analysis, simulation and experiments to
characterize the signal chain, resulting artifacts, and their elimination for
SWIFT.
Results: Theoretical analysis reveals the mechanism for gap-cycling’s
effectiveness in canceling inter-band crosstalk. We show phantom and in-vivo
results demonstrating bulls-eye artifact free images.
Conclusion: Gap cycling is an effective method to remove bulls-eye artifact
resulting from inter-band crosstalk in SWIFT data. | | Source: | arXiv, 1307.2926 | | Services: | Forum | Review | PDF | Favorites | |
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