Katsumi Tsujioka PhD, Presenter: Nothing to Disclose

Masayoshi Niwa, Abstract Co-Author: Nothing to Disclose

Yasukata Takahashi, Abstract Co-Author: Nothing to Disclose

Hironori Otsubo, Abstract Co-Author: Nothing to Disclose

Kazuhiro Shibata, Abstract Co-Author: Nothing to Disclose

Shinji Fukada, Abstract Co-Author: Nothing to Disclose

In ECG gated reconstruction by MSCT, the project date for image reconstruction is broken up by the X-ray tube revolving speed and the heart rate, which leads to changes in the temporal resolution. However, in this method there is concern that the slice sensitivity profile might change as the scope of usable data in the body axis direction changes.

According to ECG gated reconstruction, we have two possible image reconstruction methods: one emphasizes the slice thickness, and the other the temporal resolution. The former method should be used to maintain the advantages of the CT scanner. From this investigation we obtained a better understanding of ECG gated reconstruction in detail. We also identified the optimal parameters for scanning in clinical inspections.

We used our original rotating phantom to measure the temporal resolution of multi slice CT scanning, and also measured SSPz with a special phantom of micro spherical objects. In the test we used different heart rates, helical pitches and image reconstruction positions. From this investigation we obtained a better understanding of ECG gated reconstruction in detail. We also identified the optimal parameters for scanning in clinical inspections.

Tsujioka, K, Niwa, M, Takahashi, Y, Otsubo, H, Shibata, K, Fukada, S, Temporal Resolution and Slice Sensitivity Profile in ECG-gated Reconstruction Using Multislice CT.  Radiological Society of North America 2009 Scientific Assembly and Annual Meeting, November 29 - December 4, 2009 ,Chicago IL. http://archive.rsna.org/2009/8016202.html