A. Roceanu, M. Onu, L. Badea and O. Bajenaru

ABSTRACT

The brain is organised into large-scale functional networks with interactions between them. For the purpose of imaging brain networks, two fMRI techniques are particulary helpful. Diffusion tensor imaging (DTI) is based on the detection of water diffusion, which occurs preferentially in the longitudinal direction of axons, providing a mean to imagine the anatomy of axonal bundles. Functional connectivity is based on the relative synchroy of the blood-oxygen-level-dependent (BOLD) signal across brain regions that work together.

Keywords: brain network, functional connectivity, diffusion imaging, connectomics

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A. Roceanu, I. Mindruta, A. Ene, E. Copaciu, O.L. Bajenaru, O.A. Bajenaru and C. Tiu

ABSTRACT

The electroencephalographic examination (EEG) records spontaneous electrical activity generated in the cerebral cortex. The EEG is abnormal in almost all conditions associated with impairment of the level of consciousness. When consciousness is impaired the EEG becomes slowed (episodic or continuous), unresponsive to afferent stimuli, amplitude diminishes until eventually becomes flat. Coma may have various causes. EEG is a diagnostic and prognostic tool in acute anoxic coma. EEG is the only diagnostic tool for detecting a non-convulsive epileptic status.

Keywords: electroencephalography (EEG), coma, impaired consciousness

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