Journal
IEEE TRANSACTIONS ON MEDICAL IMAGING
Volume 25, Issue 1, Pages 84-93Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMI.2005.861014
Keywords
electromagnet power supplies; magnetic fields; magnetic resonance imaging; power electronics
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Funding
- NCI NIH HHS [5R24 CA 092862-03] Funding Source: Medline
- NIBIB NIH HHS [R33 EB 00777, R01 EB 00346] Funding Source: Medline
- NATIONAL CANCER INSTITUTE [R24CA092862] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [R01EB000346, R33EB000777] Funding Source: NIH RePORTER
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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.
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