Asmund Birkeland

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During night (11 p.m.-7a.m.) blood was sampled in darkness via an indwelling intravenous catheter simultaneously with polygraphic sleep registration in 7 normal men. The nocturnal melatonin secretion patterns exhibited secretory episodes. Spontaneous waking episodes were shown to be significantly correlated to the occurrence of melatonin peaks (chi c2 =(More)
Real-time volume data acquisition poses substantial challenges for the traditional visualization pipeline where data enhancement is typically seen as a pre-processing step. In the case of 4D ultrasound data, for instance, costly processing operations to reduce noise and to remove artefacts need to be executed for every frame. To enable the use of(More)
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