Method for generating cardiac CT representations with application of a contrast medium, and multi-tube CT system for carrying out this method

A multi-tube CT system, comprising:

• at least two radiation sources;
• a contrast medium application device, to scan a patient with application of contrast medium, wherein each radiation source generate different X-ray spectra for the scanning;
• and
• a control and computing unit, including at least one memory for programs and data, wherein a reconstruction of tomographic representations is carried out with the stored programs and projection data, and wherein at least one program modules is stored which, in operation, is adapted to execute the following,
• reconstructing at least one CT representation of the same cardiac phase with a first temporal resolution after a first CT scan is carried out with the multi-tube CT system, wherein at least one tube generates an X-ray spectrum,
• reconstructing at least one CT representation of the same cardiac phase per X-ray spectrum with a second temporal resolution after a second CT scan is carried out with the multi-tube CT system, wherein at least two angularly offset tubes generate different X-ray spectra;
• and
• generating a combined CT representation from results of the first and of the second scan.

A multi-tube CT system, comprising:

• means for carrying out a first CT scan;
• means for reconstructing at least one CT representation of the same cardiac phase with a first temporal resolution;
• means for subsequently carrying out a second CT scan, wherein at least two angularly offset tubes generate different X-ray spectra;
• means for reconstructing at least one CT representation of the same cardiac phase per X-ray spectrum with a second temporal resolution;
• and
• means for generating a combined CT representation from results of the first and of the second scan.