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Initial results of a new generation dual source CT system using only an in-plane comb filter for ultra-high resolution temporal bone imaging

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Abstract

Objectives

To prospectively evaluate radiation dose and image quality of a third generation dual-source CT (DSCT) without z-axis filter behind the patient for temporal bone CT.

Methods

Forty-five patients were either examined on a first, second, or third generation DSCT in an ultra-high-resolution (UHR) temporal bone-imaging mode. On the third generation DSCT system, the tighter focal spot of 0.2 mm2 removesthe necessity for an additional z-axis-filter, leading to an improved z-axis radiation dose efficiency. Images of 0.4 mm were reconstructed using standard filtered-back-projection or iterative reconstruction (IR) technique for previous generations of DSCT and a novel IR algorithm for the third generation DSCT. Radiation dose and image quality were compared between the three DSCT systems.

Results

The statistically significantly highest subjective and objective image quality was evaluated for the third generation DSCT when compared to the first or second generation DSCT systems (all p < 0.05). Total effective dose was 63 %/39 % lower for the third generation examination as compared to the first and second generation DSCT.

Conclusions

Temporal bone imaging without z-axis-UHR-filter and a novel third generation IR algorithm allows for significantly higher image quality while lowering effective dose when compared to the first two generations of DSCTs.

Key Points

• Omitting the z-axis-filter allows a reduction in radiation dose of 50 %

• A smaller focal spot of 0.2 mm 2 significantly improves spatial resolution

• Ultra-high-resolution temporal-bone-CT helps to gain diagnostic information of the middle/inner ear

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Abbreviations

CT:

Computed tomography

CTDIvol :

CT dose index

DLP:

dose length product

DSCT:

dual source CT

HU:

Hounsfield units

IR:

iterative reconstruction

ROI:

regions-of-interest

SNR:

signal-to-noise ratio

UHR:

ultra-high-resolution

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Acknowledgments

The scientific guarantor of this publication is Thomas Henzler. The authors of this manuscript declare relationships with the following companies: C.L., T.A., R.R., B.S., and T.F. are employees of Siemens Healthcare, Forchheim, Germany. All other authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. The authors with no relationship to Siemens Healthcare were in control of this study. The authors state that this work has not received any funding. One of the authors has significant statistical expertise. Institutional Review Board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study. Methodology: prospective, case-control, performed at one institution.

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Authors and Affiliations

  1. Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany

    Mathias Meyer, Holger Haubenreisser, Stefan O. Schoenberg & Thomas Henzler

  2. Computer Assisted Clinical Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany

    Florian Lietzmann & Lothar R. Schad

  3. Imaging & Therapy Division, Siemens Healthcare, Forchheim, Germany

    Rainer Raupach, Bernhard Schmidt, Christianne Leidecker, Thomas Allmendinger & Thomas Flohr

Authors
  1. Mathias Meyer
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  2. Holger Haubenreisser
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  3. Rainer Raupach
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  4. Bernhard Schmidt
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  5. Florian Lietzmann
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  6. Christianne Leidecker
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  7. Thomas Allmendinger
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  8. Thomas Flohr
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  9. Lothar R. Schad
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  10. Stefan O. Schoenberg
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  11. Thomas Henzler
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Corresponding author

Correspondence to Mathias Meyer.

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Meyer, M., Haubenreisser, H., Raupach, R. et al. Initial results of a new generation dual source CT system using only an in-plane comb filter for ultra-high resolution temporal bone imaging. Eur Radiol 25, 178–185 (2015). https://doi.org/10.1007/s00330-014-3406-4

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  • DOI: https://doi.org/10.1007/s00330-014-3406-4

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