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Navigator accuracy requirements for prospective motion correction

✍ Scribed by Julian Maclaren; Oliver Speck; Daniel Stucht; Peter Schulze; Jürgen Hennig; Maxim Zaitsev

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
459 KB
Volume
63
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

Prospective motion correction in MRI is becoming increasingly popular to prevent the image artifacts that result from subject motion. Navigator information is used to update the position of the imaging volume before every spin excitation so that lines of acquired k‐space data are consistent. Errors in the navigator information, however, result in residual errors in each k‐space line. This paper presents an analysis linking noise in the tracking system to the power of the resulting image artifacts. An expression is formulated for the required navigator accuracy based on the properties of the imaged object and the desired resolution. Analytical results are compared with computer simulations and experimental data. Magn Reson Med, 2010. © 2009 Wiley‐Liss, Inc.

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