The use of any ECG-gated CT heart scanning technique which uses a single scan must necessarily have gaps in the data. In third generation scanners these are view gaps, while in conventional fourth generation scanners they create incomplete views. It is possible to re-sort the raw data from a fourth generation scanner so that the views are defined in a third generation manner. This paper addresses two potential difficulties with this technique: (1) loss of resolution and (2) sensitivity to inequalities in detector gains. It is shown how the reconstruction algorithm can be modified to avoid these problems.
Peter M. Joseph,
"The Use Of Fourth Generation Ct Scanners For Gated Heart Scanning", Proc. SPIE 0372, Physics and Engineering in Medical Imaging, (1 November 1982); doi: 10.1117/12.934507; https://doi.org/10.1117/12.934507