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1. 发明授权

US5384537A Nuclear magnetic resonance imaging system with noise reduced intercom 失效
标题翻译：核磁共振成像系统具有降噪对讲功能
公开(公告)号：US5384537A
公开(公告)日：1995-01-24
申请号：US54522
申请日：1993-04-28
申请人： Yukinobu Ito , Eiji Moriya
发明人： Yukinobu Ito , Eiji Moriya
IPC分类号： A61B5/055 , G01R33/28 , G01R33/385 , G01R33/20
CPC分类号： G01R33/283 , G01R33/3854
摘要： 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.
摘要翻译：具有对讲设施的核磁共振成像系统，其中可以在检查室的外部减少由于应用读取梯度场脉冲引起的干扰和潜在有害的大噪声。在系统中，根据序列控制器指定的脉冲序列来控制麦克风和扬声器之间的连接，用于将检查室内产生的声音发送到检查室外部，使得麦克风和扬声器每当断开读取梯度场脉冲的应用发生。或者，系统包括连接在麦克风和扬声器之间的陷波滤波器，用于将检查室内产生的声音发送到检查室的外部，其中陷波滤波器衰减具有等于重复的中心频率的声音的分量在序列控制器指定的脉冲序列中重复施加的读取梯度场脉冲的频率。

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