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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Bibliographic Details
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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Description
Summary: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.
ISSN:0278-0062
1558-254X
DOI:10.1109/TMI.2005.861014