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Fast, simple gradient delay estimation for spiral MRI
Author(s) -
Robison Ryan K.,
Devaraj Ajit,
Pipe James G.
Publication year - 2010
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.22327
Subject(s) - spiral (railway) , measure (data warehouse) , computer science , artifact (error) , sequence (biology) , simple (philosophy) , algorithm , transmission (telecommunications) , artificial intelligence , computer vision , mathematics , data mining , telecommunications , mathematical analysis , philosophy , genetics , epistemology , biology
Timing delays between data acquisition and gradient transmission result in image degradation. This is especially true in spiral MRI, where delays can alter data in a nonuniform manner, generating significant artifact in the reconstructed data. The many methods that exist to mitigate these delays or measure the k ‐space coordinates require long measurement times, complicated analysis, specialized phantoms or hardware, or significant changes to the sequence of interest. A fast and simple method is proposed to measure delays on each gradient channel. It requires only minimal modification to an existing spiral sequence and can be used to measure independent delays on three gradient channels and any scan subject within six sequence repetition times. The effectiveness and accuracy of this method are analyzed. Magn Reson Med 63:1683–1690, 2010. © 2010 Wiley‐Liss, Inc.