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Adaptive statistical iterative reconstruction versus filtered back projection in the same patient: 64 channel liver CT image quality and patient radiation dose

  • Computed Tomography
  • Published:
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Abstract

Objectives

To compare routine dose liver CT reconstructed with filtered back projection (FBP) versus low dose images reconstructed with FBP and adaptive statistical iterative reconstruction (ASIR).

Methods

In this retrospective study, patients had a routine dose protocol reconstructed with FBP, and again within 17 months (median 6.1 months), had a low dose protocol reconstructed twice, with FBP and ASIR. These reconstructions were compared for noise, image quality, and radiation dose.

Results

Nineteen patients were included. (12 male, mean age 58). Noise was significantly lower in low dose images reconstructed with ASIR compared to routine dose images reconstructed with FBP (liver: p < .05, aorta: p < 0.001). Low dose FBP images were scored significantly lower for subjective image quality than low dose ASIR (2.1 ± 0.5, 3.2 ± 0.8, p < 0.001). There was no difference in subjective image quality scores between routine dose FBP images and low dose ASIR images (3.6 ± 0.5, 3.2 ± 0.8, NS).Radiation dose was 41% less for the low dose protocol (4.4 ± 2.4 mSv versus 7.5 ± 5.5 mSv, p < 0.05).

Conclusions

Our initial results suggest low dose CT images reconstructed with ASIR may have lower measured noise, similar image quality, yet significantly less radiation dose compared with higher dose images reconstructed with FBP.

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Acknowledgement

This work was supported in part by an unrestricted grant for clinical research from GE Healthcare.

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Authors and Affiliations

  1. Department of Radiology, University of Washington School of Medicine, 1959 NE Pacific Street, Box 357115, Seattle, WA, 98195, USA

    Lee M. Mitsumori, William P. Shuman, Janet M. Busey, Orpheus Kolokythas & Kent M. Koprowicz

Authors
  1. Lee M. Mitsumori
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  2. William P. Shuman
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  3. Janet M. Busey
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  4. Orpheus Kolokythas
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  5. Kent M. Koprowicz
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Corresponding author

Correspondence to William P. Shuman.

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Mitsumori, L.M., Shuman, W.P., Busey, J.M. et al. Adaptive statistical iterative reconstruction versus filtered back projection in the same patient: 64 channel liver CT image quality and patient radiation dose. Eur Radiol 22, 138–143 (2012). https://doi.org/10.1007/s00330-011-2186-3

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  • DOI: https://doi.org/10.1007/s00330-011-2186-3

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