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A new silent magnetic resonance imaging using a rotating DC gradient
Author(s) -
Cho Z. H.,
Chung S. T.,
Chung J. Y.,
Park S. H.,
Kim J. S.,
Moon C. H.,
Hong I. K.
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.1910390221
Subject(s) - pulse sequence , noise (video) , electromagnetic coil , interpolation (computer graphics) , physics , acoustics , nuclear magnetic resonance , projection (relational algebra) , fourier transform , spin echo , magnetic field , computer science , magnetic resonance imaging , optics , image (mathematics) , algorithm , artificial intelligence , quantum mechanics , radiology , medicine
A new approach to silent MR imaging using a rotating DC gradient has been explored and experimentally studied. Acoustic or sound noise has been one of the problems in examining patients, mainly due to the fast gradient pulsings in interaction with the main magnetic field. The sound noise has been noted to be proportionately louder as the magnetic field strength becomes larger. In this report, we describe a new imaging technique using a mechanically rotating DC gradient coil. The rotating DC gradient coil can effectively replace both phase encoding as well as readout gradient pulsings, and data obtained in this manner can provide a set of projection data that later can be used for projection reconstruction. With some interpolation techniques one can also perform conventional two‐dimensional fast Fourier transform image reconstruction. The sound noise intensity compared with the conventional imaging technique, such as the spin‐echo sequence, has been reduced down to about −20.7 dB or 117.5 times with this new technique. The experimental pulse sequence and its principle are described and images obtained by the new silent MR imaging technique are reported.