Objects that are predestined for digitization by CT scan are characterized by a special quality: Their optically perceptible surface conceals relevant information on function and design, which would otherwise only be verifiable by potentially (destructive) interventions. The generated data, however, require a very high processing effort until they are processed to a digital representation.
External service providers (e.g. Fraunhofer Application Center CTMT, Deggendorf) carry out the preparation of CT scans, while the resources for processing are internal to the project (University of Passau, Chair of Mathematics with a focus on digital image processing).
The technical process begins with the creation of absorption profiles (X-ray images) from many directions. This is followed by the computer-aided reconstruction of the volume data, whereby an absorption value is generated for each point in space - different materials have different absorption values, which offers many options for investigating the object. The obtained volume data makes the interior of the object examinable, which requires the establishment of a threshold to distinguish matter from air.