Fig. 5

SI-changes during the propagation of the contrast bolus of one dog. The use of the Savitzky–Golay filter helped to eliminate artefacts mainly caused by breathing movement. Artefacts caused by breathing movement were nearly completely eliminated. The extreme values are displayed satisfactorily according to the point of time and the height of SI. The grey line represents the raw data whereas the continuous line demonstrates the smoothed curve. After 120 s the graphical representation of the timeline was shortened