Diagnostic quality of time-averaged ECG-gated CT data

Almar Klein; Luuk J. Oostveen; Marcel J. W. Greuter; Yvonne Hoogeveen; Leo J. Schultze Kool; Cornelis H. Slump; W. Klaas Jan Renema

doi:10.1117/12.807271

13 March 2009 Diagnostic quality of time-averaged ECG-gated CT data

Almar Klein, Luuk J. Oostveen, Marcel J. W. Greuter, Yvonne Hoogeveen, Leo J. Schultze Kool, Cornelis H. Slump, W. Klaas Jan Renema

Author Affiliations +

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 725836 (2009) https://doi.org/10.1117/12.807271
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Purpose: ECG-gated CTA allows visualization of the aneurysm and stentgraft during the different phases of the cardiac cycle, although with a lower SNR per cardiac phase than without ECG gating using the same dose. In our institution, abdominal aortic aneurysm (AAA) is evaluated using non-ECG-gated CTA. Some common CT scanners cannot reconstruct a non-gated volume from ECG-gated acquired data. In order to obtain the same diagnostic image quality, we propose offline temporal averaging of the ECG-gated data. This process, though straightforward, is fundamentally different from taking a non-gated scan, and its result will certainly differ as well. The purpose of this study is to quantitatively investigate how good off-line averaging approximates a non-gated scan. Method: Non-gated and ECG-gated CT scans have been performed on a phantom (Catphan 500). Afterwards the phases of the ECG-gated CTA data were averaged to create a third dataset. The three sets are compared with respect to noise properties (NPS) and frequency response (MTF). To study motion artifacts identical scans were acquired on a programmable dynamic phantom. Results and Conclusions: The experiments show that the spatial frequency content is not affected by the averaging process. The minor differences observed for the noise properties and motion artifacts are in favor of the averaged data. Therefore the averaged ECG-gated phases can be used for diagnosis. This enables the use of ECG-gating for research on stentgrafts in AAA, without impairing clinical patient care.

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Almar Klein, Luuk J. Oostveen, Marcel J. W. Greuter, Yvonne Hoogeveen, Leo J. Schultze Kool, Cornelis H. Slump, and W. Klaas Jan Renema "Diagnostic quality of time-averaged ECG-gated CT data", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725836 (13 March 2009); https://doi.org/10.1117/12.807271

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