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Rapid polarizing field cycling in magnetic resonance imaging

We describe the electronics for controlling the independently pulsed polarizing coil in a prepolarized magnetic resonance imaging (PMRI) system and demonstrate performance with free induction decay measurements and in vivo imaging experiments. A PMRI scanner retains all the benefits of acquiring MRI...

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Published in:	IEEE transactions on medical imaging 2006-01, Vol.25 (1), p.84-93
Main Authors:	Matter, N.I., Scott, G.C., Grafendorfer, T., Macovski, A., Conolly, S.M.
Format:	Article
Language:	English
Subjects:	Coils Computer-Aided Design Control systems Data acquisition Degradation Electromagnet power supplies Electronics, Medical Equipment Design Equipment Failure Analysis Hardware Humans Image Enhancement - instrumentation Image Enhancement - methods In vivo Magnetic field measurement magnetic fields Magnetic resonance imaging Magnetic Resonance Imaging - instrumentation Magnetic Resonance Imaging - methods Magnetics - instrumentation Phantoms, Imaging Polarization power electronics Pulse measurements Reproducibility of Results Sensitivity and Specificity Transducers
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container_title	IEEE transactions on medical imaging
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creator	Matter, N.I. Scott, G.C. Grafendorfer, T. Macovski, A. Conolly, S.M.
description	We describe the electronics for controlling the independently pulsed polarizing coil in a prepolarized magnetic resonance imaging (PMRI) system and demonstrate performance with free induction decay measurements and in vivo imaging experiments. A PMRI scanner retains all the benefits of acquiring MRI data at low field, but with the higher signal of the polarizing field. Rapidly and efficiently ramping the polarizing coil without disturbing the data acquisition is one of the major challenges of PMRI. With our modular hardware design, we successfully ramp the 0.4-T polarizing coil of a wrist-sized PMRI scanner at up to 100 T/s without causing image artifacts or otherwise degrading data acquisition.
doi_str_mv	10.1109/TMI.2005.861014
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source	IEEE Electronic Library (IEL) Journals
subjects	Coils Computer-Aided Design Control systems Data acquisition Degradation Electromagnet power supplies Electronics, Medical Equipment Design Equipment Failure Analysis Hardware Humans Image Enhancement - instrumentation Image Enhancement - methods In vivo Magnetic field measurement magnetic fields Magnetic resonance imaging Magnetic Resonance Imaging - instrumentation Magnetic Resonance Imaging - methods Magnetics - instrumentation Phantoms, Imaging Polarization power electronics Pulse measurements Reproducibility of Results Sensitivity and Specificity Transducers
title	Rapid polarizing field cycling in magnetic resonance imaging
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