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Spiral demystified.

Abstract：

:Spiral acquisition schemes offer unique advantages such as flow compensation, efficient k-space sampling and robustness against motion that make this option a viable choice among other non-Cartesian sampling schemes. For this reason, the main applications of spiral imaging lie in dynamic magnetic resonance imaging such as cardiac imaging and functional brain imaging. However, these advantages are counterbalanced by practical difficulties that render spiral imaging quite challenging. Firstly, the design of gradient waveforms and its hardware requires specific attention. Secondly, the reconstruction of such data is no longer straightforward because k-space samples are no longer aligned on a Cartesian grid. Thirdly, to take advantage of parallel imaging techniques, the common generalized autocalibrating partially parallel acquisitions (GRAPPA) or sensitivity encoding (SENSE) algorithms need to be extended. Finally, and most notably, spiral images are prone to particular artifacts such as blurring due to gradient deviations and off-resonance effects caused by B(0) inhomogeneity and concomitant gradient fields. In this article, various difficulties that spiral imaging brings along, and the solutions, which have been developed and proposed in literature, will be reviewed in detail.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Delattre BM,Heidemann RM,Crowe LA,Vallée JP,Hyacinthe JN

doi

10.1016/j.mri.2010.03.036

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

862-81

issue

6

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(10)00099-8

journal_volume

28

pub_type

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