The invention relates to a spatial configuration determination apparatus for determining a spatial configuration in the surrounding of an ultrasound device, in particular, for determining the orientation of the ultrasound device and of an object in the surrounding of the ultrasound device with respect to each other. The ultrasound device is preferentially arranged at a tip (5) of a cardiac ablation catheter (4) such that, for instance, the orientation of the tip (5) relative to cardiac tissue can be determined. Motion data and/or distance data are determined in different directions from ultrasound data acquired by the ultrasound device, wherein the determined motion data and/or distance data are used for determining the spatial configuration. This allows determining, for instance, the orientation of a tip (5) of an ablation catheter (4) relative to cardiac tissue, without necessarily requiring further orientation determination means.
