1. An imaging analyzing apparatus, comprising an input device, a processing device, and an output device; wherein the input device is configured for receiving input data in form of clinical image data, geometric data, and boundary data; wherein the processing device is configured for generating flow pattern data from the geometric data and from the boundary data; wherein the processing device is configured for generating virtual image data from the generated flow pattern data; wherein the processing device is configured, to compare the clinical image data and the virtual image data, for determining a plurality of characteristic locations in the clinical image data and, in the virtual image data, the same characteristic locations; wherein the output device is configured for providing, for multiple different ones of said same characteristic locations, respective quality measures which are outputs of respective quality-measuring algorithms and which indicate the quality of correspondence between the clinical image data and the virtual image data, wherein said multiple characteristic locations are classifiable into respective characteristic location types; wherein, for a characteristic location from among said multiple characteristic locations, an algorithm from among a set of one or more of said algorithms is applied in said providing, said set varying with the type of said characteristic location; and wherein the applying entails referring to a pre-existing table that links said type correspondingly to said set and is usable in selecting said algorithm.