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Interscan registration using navigator echoes
Author(s) -
Welch Edward Brian,
Manduca Armando,
Grimm Roger C.,
Jack Clifford R.
Publication year - 2004
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.20275
Subject(s) - orientation (vector space) , image registration , computer science , computer vision , echo (communications protocol) , artificial intelligence , frame (networking) , translation (biology) , nuclear medicine , medical physics , medicine , image (mathematics) , mathematics , biochemistry , computer network , telecommunications , chemistry , geometry , messenger rna , gene
Abstract A common problem in clinical MRI is anatomic misalignment of imaging slices across successive examinations. This unnecessarily complicates the radiologic assessment of anatomic change over time on serial MRI studies. To address this problem, spherical navigator echoes, which can detect rigid body motion in all six degrees of freedom, were used to guide spatial location and orientation adjustments to an exam prescription to match the reference frame of images acquired in an earlier exam. An initial linear navigator echo is also necessary to effect coarse Z translation adjustments prior to fine six degrees of freedom adjustment with a spherical navigator echo. Results of this technique are presented for head image volumes of five volunteers. Each volunteer was imaged on two scanners. In all cases, the reference frame adjustments provided by the navigator echoes substantially improved the alignment of the latter exam and performed well compared to retrospective image‐based registration. Magn Reson Med 52:1448–1452, 2004. © 2004 Wiley‐Liss, Inc.