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Proceedings Paper

Diagnostic quality of time-averaged ECG-gated CT data
Author(s): Almar Klein; Luuk J. Oostveen; Marcel J. W. Greuter; Yvonne Hoogeveen; Leo J. Schultze Kool; Cornelis H. Slump; W. Klaas Jan Renema
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Paper 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.

Paper Details

Date Published: 13 March 2009
PDF: 6 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725836 (13 March 2009); doi: 10.1117/12.807271
Show Author Affiliations
Almar Klein, Institute of Technical Medicine, Univ. Twente (Netherlands)
Luuk J. Oostveen, Radboud Univ. Nijmegen Medical Ctr. (Netherlands)
Marcel J. W. Greuter, Univ. Medical Ctr. Groningen (Netherlands)
Yvonne Hoogeveen, Radboud Univ. Nijmegen Medical Ctr. (Netherlands)
Leo J. Schultze Kool, Radboud Univ. Nijmegen Medical Ctr. (Netherlands)
Cornelis H. Slump, Institute of Technical Medicine, Univ. Twente (Netherlands)
W. Klaas Jan Renema, Radboud Univ. Nijmegen Medical Ctr. (Netherlands)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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