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K‐space substitution: A novel dynamic imaging technique
Author(s) -
Jones R. A.,
Haraldseth O.,
Müller T. B.,
Rinck P. A.,
Øksendal A. N.
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.1910290618
Subject(s) - encode , encoding (memory) , computer science , dynamic contrast enhanced mri , set (abstract data type) , flip angle , artificial intelligence , sequence (biology) , homogeneous , image (mathematics) , computer vision , dynamic imaging , sampling (signal processing) , pattern recognition (psychology) , algorithm , mathematics , image processing , magnetic resonance imaging , chemistry , digital image processing , medicine , biochemistry , radiology , filter (signal processing) , combinatorics , gene , programming language
A rapid dynamic imaging sequence has been developed in which only the 32 phase encoding steps that encode low spatial frequencies are collected for each dynamic image. These are substituted into a previously acquired, 128 × 128 raw data set prior to image reconstruction. In this way the dynamic information is retained while the overall appearance is improved in comparison with images obtained by zero filling to 128 × 128, leading to better qualitative evaluation. The limited k‐space sampling means that the technique is most effective for large homogeneous areas of signal change since fine changes in contrast are imperfectly recorded.