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nouna graphical record of electrical activity of the brain; produced by an electroencephalograph
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nounan X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast
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Definition that contains encephalogram
- encephalography roentgenography of the brain after spinal fluid has been replaced by a gas (usually oxygen); produces an encephalogram
- beta rhythm the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz
- brain dead having irreversible loss of brain function as indicated by a persistent flat electroencephalogram
- theta wave the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude
- delta rhythm the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz)
- alpha wave the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz
- delta wave the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz)
- alpha rhythm the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz
- beta wave the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz
- theta rhythm the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude