Diagnostic quality of time-averaged ECG-gated CT data

Almar Klein, L.J. Oostveen, M.J.W. Greuter, Y. Hoogeveen, L.J. Schultze Kool, Cornelis H. Slump, W.K.J. Renema

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    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 off-line 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 prop-erties (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.
    Original languageUndefined
    Title of host publicationProceedings of SPIE Medical Imaging 2008
    EditorsEhsan Samei, Jiang Hsieh
    PublisherSPIE
    Pages725836
    Number of pages6
    ISBN (Print)9780819475091
    DOIs
    Publication statusPublished - Feb 2009
    EventSPIE Medical Imaging 2008 - Town & Country Resort and Convention Center, San Diego, United States
    Duration: 16 Feb 200821 Feb 2008

    Publication series

    Name
    PublisherSPIE
    Number725836
    Volume7258

    Conference

    ConferenceSPIE Medical Imaging 2008
    CountryUnited States
    CitySan Diego
    Period16/02/0821/02/08

    Keywords

    • ECG gating
    • EWI-15294
    • IR-65465
    • METR
    • METIS-263817
    • CT

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