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k ‐Space weighted image contrast (KWIC) for contrast manipulation in projection reconstruction MRI
Author(s) -
Song Hee Kwon,
Dougherty Lawrence
Publication year - 2000
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 - 10.1002/1522-2594(200012)44:6<825::aid-mrm2>3.0.co;2-d
Subject(s) - contrast (vision) , projection (relational algebra) , artificial intelligence , computer science , computer vision , image resolution , set (abstract data type) , k space , data set , image contrast , image (mathematics) , sequence (biology) , cartesian coordinate system , resolution (logic) , iterative reconstruction , pattern recognition (psychology) , mathematics , algorithm , mathematical analysis , geometry , fourier transform , biology , genetics , programming language
Abstract A novel technique for manipulating contrast in projection reconstruction MRI is described. The method takes advantage of the fact that the central region of k ‐space is oversampled, allowing one to choose different filters to enhance or reduce the amount that each view contributes to the central region, which dominates image contrast. The technique is implemented into a fast spin‐echo (FSE) sequence, and it is shown that multiple T 2 ‐weighted images can be reconstructed from a single image data set. These images are shown to be nearly identical to those acquired with the Cartesian‐sampled FSE sequence at different effective echo times. Further, it is demonstrated that T 2 maps can be generated from a single image data set. This technique also has the potential to be useful in dynamic contrast enhancement studies, capable of yielding a series of images at a significantly higher effective temporal resolution than what is currently possible with other methods, without sacrificing spatial resolution. Magn Reson Med 44:825–832, 2000. © 2000 Wiley‐Liss, Inc.