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The Influence of Patient Miscentering on Patient Dose and Image Noise in Two Commercial ct Scanners

  • Conference paper
XII Mediterranean Conference on Medical and Biological Engineering and Computing 2010

Part of the book series: IFMBE Proceedings ((IFMBE,volume 29))

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Abstract

The clinical influences of patient miscentering on patient dose and image noise were investigated for two models of commercial CT scanners. Several phantoms were scanned on 4-slice GE Lightspeed and 64-slice GE Lightspeed VCT. Regression models of surface dose and image noise were generated as a function of phantom size and the value of miscentering. 64 scout images of patients from the first scanner and 113 from the second one were analyzed to assess the possible amount of increasing in dose and noise. For the first scanner the average amount of miscentering was 3 cm below the isocenter which leads to 25.8% increase in dose and 8.3% increase in noise. These values for the second scanner were 1.6 cm below the center, 19.8% and 6.2%, respectively. The results clearly demonstrate that patient miscentering may substantially increase dose and image noise. Therefore, technologists are strongly encouraged to pay greater attention to patient centering.

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Authors and Affiliations

  1. Faculty of Medical Radiation Engineering, Shahid Beheshti University, Tehran, Iran

    M. A. Habibzadeh & A. R. Kamali asl

  2. Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran

    M. A. Habibzadeh & M. R. Ay

  3. Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran

    M. R. Ay

  4. Research Institute for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran

    M. R. Ay & H. Ghadiri

  5. Department of Medical Physics, Iran University of Medical Sciences, Tehran, Iran

    H. Ghadiri

  6. Division of Nuclear Medicine, Geneva University Hospital, Geneva, Switzerland

    H. Zaidi

  7. Geneva Neuroscience Center, Geneva University, Geneva, Switzerland

    H. Zaidi

Authors
  1. M. A. Habibzadeh
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  2. M. R. Ay
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  3. A. R. Kamali asl
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  4. H. Ghadiri
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  5. H. Zaidi
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Editor information

Editors and Affiliations

  1. Lab of Medical Informatics, Medical Scho, Aristotle University of Thessaloniki, 541 24, Thessaloniki, Greece

    Panagiotis D. Bamidis

  2. Biomedical Technology Unit, University of Patras, 265 04, Rio Patras, Greece

    Nicolas Pallikarakis

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© 2010 International Federation for Medical and Biological Engineering

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Habibzadeh, M.A., Ay, M.R., asl, A.R.K., Ghadiri, H., Zaidi, H. (2010). The Influence of Patient Miscentering on Patient Dose and Image Noise in Two Commercial ct Scanners. In: Bamidis, P.D., Pallikarakis, N. (eds) XII Mediterranean Conference on Medical and Biological Engineering and Computing 2010. IFMBE Proceedings, vol 29. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-13039-7_82

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  • DOI: https://doi.org/10.1007/978-3-642-13039-7_82

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-13038-0

  • Online ISBN: 978-3-642-13039-7

  • eBook Packages: EngineeringEngineering (R0)

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