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Automatic field map generation and off‐resonance correction for projection reconstruction imaging
Author(s) -
Nayak Krishna S.,
Nishimura Dwight G.
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/(sici)1522-2594(200001)43:1<151::aid-mrm19>3.0.co;2-k
Subject(s) - projection (relational algebra) , artifact (error) , image resolution , iterative reconstruction , field (mathematics) , echo (communications protocol) , computer science , computer vision , artificial intelligence , nuclear magnetic resonance , physics , mathematics , algorithm , computer network , pure mathematics
Abstract A new projection reconstruction technique utilizes the oversampling of low spatial frequencies to estimate and correct for off‐resonance effects. Interleaved spokes are acquired at one of two different echo times. From separated early‐TE and late‐TE raw data, two one‐quarter resolution images are reconstructed and a one‐quarter resolution field map is computed. Multifrequency reconstruction with all the data is then used to simultaneously correct for off‐resonance and compensate for the difference in echo times. Resulting images obtained on phantoms and in vivo demonstrate significantly reduced off‐resonance artifact without the acquisition of a separate field map. Magn Reson Med 43:151–154, 2000. © 2000 Wiley‐Liss, Inc.