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European Radiology
Published in: European Radiology 12/2016

01-12-2016 | Chest

Submillisievert CT using model-based iterative reconstruction with lung-specific setting: An initial phantom study

Authors: Akinori Hata, Masahiro Yanagawa, Osamu Honda, Tomoko Gyobu, Ken Ueda, Noriyuki Tomiyama

Published in: European Radiology | Issue 12/2016

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Abstract

Objective

To assess image quality of filtered back-projection (FBP) and model-based iterative reconstruction (MBIR) with a conventional setting and a new lung-specific setting on submillisievert CT.

Methods

A lung phantom with artificial nodules was scanned with 10 mA at 120 kVp and 80 kVp (0.14 mSv and 0.05 mSv, respectively); images were reconstructed using FBP and MBIR with conventional setting (MBIRStnd) and lung-specific settings (MBIRRP20/Tx and MBIRRP20). Three observers subjectively scored overall image quality and image findings on a 5-point scale (1 = worst, 5 = best) compared with reference standard images (50 mA-FBP at 120, 100, 80 kVp). Image noise was measured objectively.

Results

MBIRRP20/Tx performed significantly better than MBIRStnd for overall image quality in 80-kVp images (p < 0.01), blurring of the border between lung and chest wall in 120p-kVp images (p < 0.05) and the ventral area of 80-kVp images (p < 0.001), and clarity of small vessels in the ventral area of 80-kVp images (p = 0.037). At 120 kVp, 10 mA-MBIRRP20 and 10 mA-MBIRRP20/Tx showed similar performance to 50 mA-FBP. MBIRStnd was better for noise reduction. Except for blurring in 120 kVp-MBIRStnd, MBIRs performed better than FBP.

Conclusion

Although a conventional setting was advantageous in noise reduction, a lung-specific setting can provide more appropriate image quality, even on submillisievert CT.

Key Points

• Lung-specific submillisievert 10 mA-MBIR CT setting has similar performance to 50 mA-FBP
• The new lung-specific settings improve vessel clarity and blurring of borders
• The new settings may provide more appropriate images than conventional settings
Appendix
Available only for authorised users
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Metadata
Title
Submillisievert CT using model-based iterative reconstruction with lung-specific setting: An initial phantom study
Authors
Akinori Hata
Masahiro Yanagawa
Osamu Honda
Tomoko Gyobu
Ken Ueda
Noriyuki Tomiyama
Publication date
01-12-2016
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 12/2016
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-016-4307-5

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