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Generalized K-space analysis and correction of motion effects in MR imaging

✍ Scribed by M. Louis Lauzon; Brian K. Rutt

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
935 KB
Volume
30
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

A new approach to understanding and reducing motion artifacts in magnetic resonance imaging (MRI) is introduced. This paper presents a novel technique for correcting generalized motion artifacts arising from translation, rotation, dilation, and compression, or any combination thereof. We also describe a new pulse sequence and a specialized postprocessing technique required to suppress these motion artifacts. The correction algorithm corrects for generalized motion. The theoreticial basis of the correction scheme is founded upon the (k,t)‐space formalism and the concept of pulse sequence contrast mapping functions. The proposed (k,t) formalism is based on the Fourier projection slice theorem and allows us to determine how motion artifacts arise. The correction technique currently suffers from some spatial resolution and signal‐to‐noise ratio limitations, and works better for small object than large objects. These problems will be investigated in subsequent studies.

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