Multisegment picture reconstruction for cardio CT pictures

A method for reconstruction of picture data of a cyclically moving object from measurement data, the measurement data having been recorded for a relative rotation movement between a radiation source of a computed tomography system and the object under examination during a plurality of movement cycles of the object under examination, the method comprising:

• determining a first picture and a second picture from the measurement data, the first picture is reconstructed from data of a first movement cycle to calculate the difference information, the second picture being reconstructed from data of a second movement cycle;
• computing difference information by a comparison of the first picture with the second picture;
• determining a mean value picture from the first and the second picture;
• and
• computing a result picture using the difference information and a third picture, the third picture being based on the data of the first movement cycle and the data of the second movement cycle, wherein, to compute the result picture pixel-by-pixel, a weighted sum is directly formed from the first picture and the second picture, with the weighting depending on the difference information.

A control and processing unit for reconstruction of picture data of an object under examination from measurement data of a CT system, comprising:

• a program memory for storage of program code, the program code being present in the program memory and carrying out, when executed,
• determining a first picture and a second picture from the measurement data, with measurement data of different movement cycles being combined into a measurement dataset on which to base the picture reconstruction for reconstruction of the second picture,
• computing difference information by a comparison of the first picture with the second picture, and
• computing a result picture using the difference information from the first picture and the second picture, wherein, to compute the result picture pixel-by-pixel, a weighted sum is directly formed from the first picture and the second picture, with the weighting depending on the difference information.