The objective of the study is to assess brain tissue perfusion by contrast-enhanced ultrasound perfusion imaging (PerCEUS) in acute brain injuries. More precisely, it aims : * to evaluate the heterogeneity of brain perfusion and thus diagnose brain tissue hypoperfusion with contrast-enhanced ultrasound. * to correlate contrast-enhanced ultrasound with perfusion measurements by usual multimodal monitoring.
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Evaluation of the heterogeneity of brain perfusion by time-to-peak (TPI) measurement
Timeframe: 30 minutes after PerCEUS
Evaluation of the heterogeneity of brain perfusion by peak-intensities (PI) measurement
Timeframe: 30 minutes after PerCEUS