1. A method for bolus tracking, comprising: acquiring one or more baseline images; automatically establishing one or more trigger regions within each of the one or more baseline images; administering a bolus; monitoring the automatically established trigger regions for bolus arrival at the one or more trigger regions; forecasting bolus arrival at a volume of interest based on the bolus arrival at the one or more trigger regions; and acquiring a diagnostic scan of the volume of interest at the forecasted time.