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:
Apr. 15, 2003
Filed:
Dec. 05, 2001
Nicolaas Bernardus Roozen, Eindhoven, NL;
Gerard Van Schothorst, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
Vibrations of the gradient coil carrier ( ) medical MRI apparatus should be counteracted because they give rise to disturbing noise and macroscopic movements that deteriorate the image quality. In accordance with the invention the gradient coil system is suspended by means of weak resilient suspension elements ( ) that are connected in series with piezo actuators ( ). The actuators are controlled in such a way that macroscopic movements at low-frequency vibrations (order of magnitude of 10 Hz) that are due to the very resilient suspension are counteracted, and also that the high-frequency vibrations (order of magnitude of 700 Hz) that result from internal Lorentz forces are hardly transferred to the frame of the apparatus.