An imaging apparatus for imaging a heart is provided, wherein the imaging of the heart is improved such that conclusions about regions of the heart having an abnormal behaviour can be made more accurate and more optimal. The imaging apparatus comprises a first site determination unit for determining a first site of the heart comprising a first property type like a fractionated electrogram (70,71,74,75) and a second site determination unit for determining a second site comprising a second property type like a ganglionated plexus (72,73). The first site and the second site are causally related and displayed on a display unit. Since the displayed first and second sites are causally related to each other, a further information is given, i.e. the causal relation, which assists a user in finding regions of the heart showing an abnormal behaviour.