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Novel T * 2 ‐weighted contrast preparation scheme for segmented k ‐space myocardial imaging
Author(s) -
Redpath T.W.,
Semple S.I.K.,
Waiter G.D.,
Frisch L.,
Norton M.Y.,
Morris D.M.,
Egred M.
Publication year - 2003
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.10419
Subject(s) - subtraction , k space , image (mathematics) , contrast (vision) , image subtraction , mathematics , artifact (error) , combinatorics , space (punctuation) , phase contrast microscopy , physics , artificial intelligence , nuclear medicine , computer science , computer vision , algorithm , image processing , mathematical analysis , medicine , optics , arithmetic , binary image , fourier transform , operating system
A novel T * 2 ‐weighted contrast‐preparation scheme is described for use with segmented k ‐space cardiac sequences. This approach frees the imaging phase from the requirement of a long TE and, hence, a relatively long TR. A [90° x ‐τ‐90° ρ ] preparation scheme is used to acquire four image data sets with the phase ρ of the second pulse set to x , y , – x , and – y . The ρ = x raw data is subtracted from the ρ = – x data to form the “ x ” image, with a similar subtraction to generate the “ y ” image. These images are added in quadrature to obtain the T * 2 ‐weighted image. The method results in reduced artifact compared to a simple two‐image scheme with ρ = x , and y . T * 2was measured in the myocardial septum in six normal volunteers by comparing τ = 7 and 28 ms images, and it was found to be 44 ± 5 ms at 0.95 T. Magn Reson Med 49:776–780, 2003. © 2003 Wiley‐Liss, Inc.