发明名称 |
Gradient speed-up circuit for NMR apparatus. |
摘要 |
<p>A gradient current speed-up circuit, for use in a higher-speed NMR imaging system having an associated gradient coil, has a gradient power amplifier receiving an input analog signal controlling amplifier output current, and a transformer having a primary winding and a pair of secondary windings connected in series with the amplifier output and the coil. Semiconductor switching elements selectively connect the primary winding between first and second potential sources, and are turned on and off in selected patterns to cause a current to be suddenly applied to, and removed from, flow through the associated gradient coil; the amplifier output current is changed when the gradient coil current lags behind an amplitude commanded by a master input signal. <IMAGE></p> |
申请公布号 |
EP0460895(A2) |
申请公布日期 |
1991.12.11 |
申请号 |
EP19910305001 |
申请日期 |
1991.06.03 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
ROEMER, PETER BERNARD;PARK, JOHN NORTON;MUELLER, OTWARD MARIA;MCMURRAY, WILLIAM |
分类号 |
A61B5/055;G01R33/385;G01R33/48;H01F7/20 |
主分类号 |
A61B5/055 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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