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Generalized K‐space analysis and correction of motion effects in MR imaging
Author(s) -
Louis Lauzon M.,
Rutt Brian K.
Publication year - 1993
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910300406
Subject(s) - k space , pulse sequence , computer science , fourier transform , translation (biology) , computer vision , artificial intelligence , motion estimation , algorithm , formalism (music) , physics , mathematics , nuclear magnetic resonance , mathematical analysis , art , musical , biochemistry , chemistry , messenger rna , visual arts , gene
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.