1. A method for processing of diagnostic image data, comprising: determining three-dimensional image information using an imaging medico-technical method, in which an examined volume is subdivided into a plurality of voxels and each voxel is allocated one measurement value; selecting a subset of the voxels, the measurement values associated with the selected voxels satisfying a specific relationship with at least one defined limit value; identifying at least one cohesive volume area within the selected subset of the voxels; determining a surface of the identified cohesive volume area; determining the distance between voxels within the cohesive volume area and the surface; identifying volume elements within the cohesive volume area, with each volume element including a central voxel whose distance from the surface represents a local maximum; determining a constriction within the cohesive volume area, which constriction separates identified volume elements from one another; and subdividing the determined image information into a plurality of data subsets, the constriction providing a boundary between the different data subsets.