A GTO speed-up inverter for fast-scan magnetic resonance imaging

Author

Mueller, O.M. ; Roemer, P.B. ; Park, J.N. ; Souza, S.P. ; Peters, R. L St

Author_Institution

General Electric Co., Schenectady, NY, USA

fYear

1992

fDate

23-27 Feb 1992

Firstpage

479

Lastpage

486

Abstract

Magnetic resonance imaging (MRI) machines require unique high-power electronic systems for the generation of pulsed B gradient fields, especially for echo planar MRI, where images are taken in 25-30 ms instead of minutes. The speedup inverter described has been implemented with gate turn-off thyristors (GTOs). A novel nonresonant circuit combines the advantages of high-efficiency switch-mode power conversion techniques for the generation of megawatt pulses. An order-of-magnitude increase in available gradient power has been achieved with excellent fidelity and stability

Keywords

biomedical NMR; biomedical electronics; invertors; pulsed power technology; switched mode power supplies; thyristor applications; 25 to 30 ms; GTO; HF; SMPS; biomedical NMR; echo planar MRI; magnetic resonance imaging; nonresonant circuit; power electronics; pulsed B gradient fields; pulsed power technology; speedup inverter; stability; Coils; Inverters; Magnetic resonance imaging; Power generation; Pulse amplifiers; Pulse generation; Pulse power systems; Switches; Thyristors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 1992. APEC '92. Conference Proceedings 1992., Seventh Annual

Conference_Location

Boston, MA

Print_ISBN

0-7803-0485-3

Type

conf

DOI

10.1109/APEC.1992.228371

Filename

228371