Software balancing of multiple detectors during CT scanning.

Abstract

The general requirements for balancing of detectors in a multiple detector CT scanner are discussed, and the specific requirements for software balancing using data acquired within the body section during the scan are outlined. A particular technique which can be implemented in a scanner employing a simultaneous translation and rotation of the source/detector package is presented. The technique produces an exact balancing offset and gain factors, to within accuracy limits imposed by the statistical uncertainty due to noise in the measurements. However, the technique admits a redundancy of solutions with allows the statistical sample to be expanded to include virtually all data acquired during the scan, thereby suppressing detector imbalance artifacts to the same level as overall quantum noise in the image.