Apparatus and method for recording an electroencephalogram during magnetic resonance imaging
First Claim
1. A method for obtaining an electroencephalogram during magnetic resonance imaging of a patient positioned in a magnetic resonance imaging room, comprising the steps of:
- placing a plurality of nonmagnetic electrodes on the patient'"'"'s head so as to be able to record the patient'"'"'s electroencephalogram;
transmitting electroencephalogram signals from the plurality of electrodes to an amplifier; and
recording the amplified electroencephalogram signals.
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Accused Products
Abstract
A method and apparatus for recording an electroencephalogram (EEG) during magnetic resonance imaging (MRI). Nonmagnetic electrodes are attached to a patient'"'"'s scalp. EEG signals are multiplexed, amplified, and transmitted to an EEG machine or a personal computer located outside the MRI room. By reducing the amount of magnetic metal and radio frequency generating equipment associated with the recording of the EEG that is within the bore of the MRI magnet, and moving all significant radio frequency generating equipment outside the MRI room, EEG signals can be recorded and MRI images can be obtained simultaneously. The EEG signals are analyzed and, in response to a predetermined pattern, the MRI machine is triggered.
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Citations
36 Claims
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1. A method for obtaining an electroencephalogram during magnetic resonance imaging of a patient positioned in a magnetic resonance imaging room, comprising the steps of:
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placing a plurality of nonmagnetic electrodes on the patient'"'"'s head so as to be able to record the patient'"'"'s electroencephalogram; transmitting electroencephalogram signals from the plurality of electrodes to an amplifier; and recording the amplified electroencephalogram signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for obtaining an electroencephalogram during magnetic resonance imaging, comprising:
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a plurality of nonmagnetic electrodes for receiving electroencephalogram signals from a patient; an amplifier; first electrical connection means for electrically connecting the plurality of electrodes to an input of the amplifier; means for recording the electroencephalogram signals; and second electrical connection means for electrically connecting the recording means to an output of the amplifier. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for obtaining an electroencephalogram during magnetic resonance imaging, comprising:
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a plurality of nonmagnetic electrodes for receiving electroencephalogram signals from a patient; a multiplexor; a plurality of cables electrically connected to the plurality of electrodes and to an input of the multiplexor; an amplifier, wherein an input of the amplifier is electrically connected to an output of the multiplexor; a signal splitter; means for electrically connecting an output of the amplifier to an input of the signal splitter; a demultiplexor having a plurality of outputs, wherein an input of the demultiplexor is electrically connected to a first output of the signal splitter; an electroencephalograph machine electrically connected to the plurality of outputs of the demultiplexor; and a signal processor having an input electrically connected to a second output of the signal splitter, wherein the signal processor comprises means for generating a signal to trigger a magnetic resonance imaging machine in response to a selected electroencephalogram signal pattern.
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20. A medical diagnostic apparatus comprising:
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a magnetic resonance imaging machine; a device for recording electroencephalograph signals operated simultaneously with the magnetic resonance imaging machine; means for transmitting a plurality of electroencephalogram signals from a patient undergoing magnetic resonance imaging to the device for recording electroencephalograph signals; and means responsive to the plurality of electroencephalogram signals for triggering the magnetic resonance imaging machine when a predetermined pattern of electroencephalogram signals is received. - View Dependent Claims (21)
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22. A method for obtaining metabolic information correlated to particular neurophysiological waveforms within a brain, comprising the steps of:
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preparing a measurement system to perform magnetic resonance imaging while preventing interference with diagnostic quality of the magnetic resonance imaging; continuously monitoring electroencephalogram data from the brain; comparing the electroencephalogram data to electroencephalogram characteristics representing the particular neurophysiological waveforms; triggering a magnetic resonance imaging in response to electroencephalogram data comparable to the particular neurophysiological waveforms; and performing the magnetic resonance imaging. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus with means for obtaining metabolic information correlated to particular neurophysiological waveforms within a brain, comprising:
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a magnetic resonance imaging machine capable of measuring metabolic information; means for continuously monitoring electroencephalogram data from the brain; means for preventing interference with diagnostic quality of magnetic resonance imaging of the magnetic resonance imaging machine; and means for triggering magnetic resonance imaging in response to electroencephalogram data corresponding to the particular neurophysiological waveforms. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification