The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 1992
Filed:
Mar. 26, 1990
Horst Siebold, Erlangen, DE;
Wolfgang Frie, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A magnetic resonance imaging apparatus generates tomograms according to the echo planar imaging method (EPI), with at least one of the gradient coils having a resonant circuit allocated thereto which is excited by an amplifier. A capacitor forms a series resonant circuit with the gradient coil, and a controlled gain amplifier which is operated as a current regulator, such as a switched current regulator, is connected to this series resonant circuit. The read-out gradient G.sub.x is switched on at a time t.sub.0, the gradient G.sub.x having a transient region .tau..sub.1 beginning at t.sub.0 and ending at a time t.sub.2. The gradient current I(t) is steady in this transient region .tau..sub.1, and the integral of the gradient current I(t) over t.sub.0 through t.sub.2 is zero.