Method for identifying a change in truncation, control facility, CT apparatus, computer program and electronically readable data carrier

A control facility for identifying a change in truncation of an examination object between first projection photographs of the examination object generated by a CT apparatus, and second projection photographs of the examination object generated by the CT apparatus, wherein the control facility is configured to:

• receive a first dataset comprising the first projection photographs of the examination object;
• receive a second dataset, comprising the second projection photographs of the examination object;
• correlate the first dataset with the second dataset;
• establish the change in truncation of the examination object between the first projection photographs and the second projection photographs when satisfaction of at least one predefined change criterion between the first dataset and the second dataset is captured;
• and
• output a predetermined output signal when the change in truncation between the first projection photographs and the second projection photographs is established or compensate the change in truncation between the first projection photographs and the second projection photographs according to a predetermined compensation method.

A non-transitory computer-readable storage medium comprising instructions for identifying a change in truncation of an examination object between first projection photographs of the examination object generated by a CT apparatus, and second projection photographs of the examination object generated by the CT apparatus, the instruction that, when executed by one or more processing units, cause the one or more processing units to:

• receive a first dataset, comprising the first projection photographs of the examination object;
• receive a second dataset comprising the second projection photographs of the examination object;
• correlate the first dataset with the second dataset;
• establish the change in truncation of the examination object between the first projection photographs and the second projection photographs when satisfaction of at least one predefined change criterion between the first dataset and the second dataset is captured;
• and
• output a predetermined output signal when the change in truncation between the first projection photographs and the second projection photographs is established or compensating the change in truncation between the first projection photographs and the second projection photographs according to a predetermined compensation method.