Abstract
A 3-D spherical navigator (SNAV) echo technique for MRI that can measure rigid body motion in all six degrees of freedom simultaneously by sampling a spherical shell in k-space is under development. Rigid body 3-D rotations of an imaged object simply rotate the k-space data, while translations alter phase in a known way. A computer controlled motion phantom was used to execute known rotations and translations to evaluate the technique. Accurate detection was possible with a double SNAV echo acquisition following a 3-D helical spiral trajectory. Motion detection for retrospective or prospective correction in MRI with spherical navigator echoes is thus feasible and practical.
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© 2001 Springer-Verlag Berlin Heidelberg
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Welch, E.B., Manduca, A., Grimm, R.C., Ward, H.A., Jack, C.R. (2001). Spherical Navigator Echoes for Full 3-D Rigid Body Motion Measurement in MRI. In: Niessen, W.J., Viergever, M.A. (eds) Medical Image Computing and Computer-Assisted Intervention – MICCAI 2001. MICCAI 2001. Lecture Notes in Computer Science, vol 2208. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45468-3_176
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DOI: https://doi.org/10.1007/3-540-45468-3_176
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