1. An ablated object region determining apparatus for determining an ablated object region for ablating an object of interest, the ablated object region determining apparatus comprising: a geometrical representation providing unit for providing a geometrical representation of the object of interest, of at least one energy influencing element and of a spatial relationship between the object of interest and the at least one energy influencing element; an ablation element setting unit for allowing a user to set an orientation and position of an ablation element with respect to the provided geometrical representation; a model ablation region storing unit, in which model ablation regions are stored depending on a spatial relationship between a model ablation element and at least one model energy influencing element, wherein a model ablation region defines a region, which will be ablated given a respective spatial relationship between the model ablation element and the at least one model energy influencing element; a model ablation region retrieving unit for retrieving a model ablation region, which corresponds to the spatial relationship between the ablation element in the set orientation and in the set position and the at least one energy influencing element represented by the provided geometrical representation, from the model ablation region storing unit; and an ablated object region determining unit for determining at least one of a) an ablated object region of the object of interest being located within the retrieved model ablation region and b) a non-ablated object region of the object of interest being located outside the retrieved model ablation region.