Trajectory correction for free-breathing radial cine MRI.

Abstract:

:Radial acquisitions can suffer from trajectory errors leading to reduced image quality. Here we present a new method of trajectory correction that uses all spokes of a radial acquisition and compare it to an existing method that uses a two-spoke pre-scan calibration. For both methods, estimates of the necessary shifts were made using magnitude or phase data and the performances were compared. The additional effect of B0 correction was considered in all cases. Mouse cardiac scans were used for the comparisons and we also compared the quality of navigator signals obtained from the radial data with each technique. The proposed method gave improved image quality over the existing method, as assessed by visual inspection and quantitative evaluation of artifacts. The typical shading artifacts seen in radial scans were significantly reduced with both approaches, with phase-based corrections generally outperforming magnitude-based methods. B0 correction gave further improvements in each case. Furthermore, modulation of navigator signals due to the acquisition angle was significantly reduced with the new technique. We show that our proposed method works well to reduce artifacts seen in mouse cardiac imaging that can make faster imaging feasible.

journal_name

Magn Reson Imaging

authors

Buonincontri G,Methner C,Krieg T,Carpenter TA,Sawiak SJ

doi

10.1016/j.mri.2014.04.006

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

961-4

issue

7

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(14)00131-3

journal_volume

32

pub_type

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