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. 24, 1995
Filed:
Apr. 28, 1993
Yukinobu Ito, Tochigiken, JP;
Eiji Moriya, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kanagawaken, JP;
Abstract
A nuclear magnetic resonance imaging system with the intercom facility in which the disturbing and potentially harmful large noise due to the application of the reading gradient field pulses can be reduced at the exterior of the examination room. In the system, a connection between the microphone and the loudspeaker for transmitting the sounds generated inside the examination room to the exterior of the examination room is controlled according to the pulse sequence specified by the sequence controller such that the microphone and the loudspeaker are disconnected whenever the application of the reading gradient field pulse takes place. Alternatively, the system incorporates a notch filter connected between the microphone and the loudspeaker for transmitting the sounds generated inside the examination room to the exterior of the examination room, where the notch filter attenuates the component of the sounds having a central frequency equal to a repetition frequency of repeatedly applied reading gradient field pulses in the pulse sequence specified by the sequence controller.