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Spiral scanning with anisotropic field of view
Author(s) -
King Kevin F.
Publication year - 1998
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.1910390315
Subject(s) - spiral (railway) , field of view , anisotropy , image resolution , optics , resolution (logic) , image quality , field (mathematics) , radius , physics , computer science , computer vision , mathematics , artificial intelligence , image (mathematics) , mathematical analysis , computer security , pure mathematics
Spiral scanning has been used to achieve much shorter scan times than conventional techniques for a wide range of applications. The major drawback with spiral scans is blurring from off‐resonant spins, which is proportional to the readout time. Blurring limits maximal spatial resolution and minimal scan time potentially achievable with spiral scanning. Anisotropic field of view is used in conventional scanning to improve image quality by matching /c‐space trajectory to object characteristics. Anisotropic field of view improves spatial resolution in spiral scanning without increasing scan time or blurring. The resolution improvement results from increased maximal k‐space radius allowed by the lower field of view. A field of view reduction by a factor of 2 in one direction provides up to 60% resolution improvement in that direction. Reduced SNR also results from non‐uniform /c‐space sampling.