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Feasibility of low-radiation-dose CT for abdominal examinations with hybrid iterative reconstruction algorithm: low-contrast phantom study

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Abstract

Our purpose in this study was to evaluate the image quality of low-radiation-dose CT using hybrid iterative reconstruction (HIR), and to compare the results with those of filtered back projection (FBP) at routine doses. We measured the mean values and standard deviation of the CT numbers within and outside a 15-mm low-contrast object cylinder at 1.0 % contrast level. The noise reduction levels of the HIR were 1 (weak) to 7 (strong). Visual inspection of the low-contrast detectability was done by six radiologic technologists. The low-contrast detectability of the cylinder at the 1.0 % contrast level with HIR at all mAs levels was equal to that obtained with FBP, and thus the use of HIR did not result in any improvement of low-contrast detectability.

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Acknowledgments

We appreciate the technical support we received from the Research Support Center, Graduate School of Medical Sciences, Kyushu University, and Kouichiro Tawara and Hidekazu Ota from Philips Healthcare for technical assistance with the enormous HIR reconstruction. This work was partly supported by Philips Healthcare. Technical support for this study was provided by Philips Healthcare, and two of the coauthors, Ko Higuchi and Taisuke Fujioka, are employees of Philips Electronics Japan Medical Systems.

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Authors and Affiliations

  1. Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, 812-8582, Japan

    Masatoshi Kondo, Takashi Shirasaka & Yasuhiko Nakamura

  2. Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, 812-8582, Japan

    Masamitsu Hatakenaka, Ko Higuchi, Katsumasa Nakamura, Takashi Yoshiura & Hiroshi Honda

  3. Department of Diagnostic Radiology, Sapporo Medical University, South 1, West 16, Chuo-Ku, Sapporo, Hokkaido, 060-8543, Japan

    Masamitsu Hatakenaka

  4. CT Application, Philips Electronics Japan Medical Systems, 2-13-37 Kounan, Minato-ku, Tokyo, 108-8507, Japan

    Taisuke Fujioka

Authors
  1. Masatoshi Kondo
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  2. Masamitsu Hatakenaka
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  3. Ko Higuchi
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  4. Taisuke Fujioka
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  5. Takashi Shirasaka
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  6. Yasuhiko Nakamura
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  7. Katsumasa Nakamura
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  8. Takashi Yoshiura
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  9. Hiroshi Honda
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Correspondence to Masatoshi Kondo.

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Kondo, M., Hatakenaka, M., Higuchi, K. et al. Feasibility of low-radiation-dose CT for abdominal examinations with hybrid iterative reconstruction algorithm: low-contrast phantom study. Radiol Phys Technol 6, 287–292 (2013). https://doi.org/10.1007/s12194-012-0197-7

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  • DOI: https://doi.org/10.1007/s12194-012-0197-7

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