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European Radiology
Published in: European Radiology 8/2014

01-08-2014 | Chest

Iterative reconstruction technique vs filter back projection: utility for quantitative bronchial assessment on low-dose thin-section MDCT in patients with/without chronic obstructive pulmonary disease

Authors: Hisanobu Koyama, Yoshiharu Ohno, Mizuho Nishio, Sumiaki Matsumoto, Naoki Sugihara, Takeshi Yoshikawa, Shinichiro Seki, Kazuro Sugimura

Published in: European Radiology | Issue 8/2014

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Abstract

Objectives

The aim of this study was to evaluate the utility of the iterative reconstruction (IR) technique for quantitative bronchial assessment during low-dose computed tomography (CT) as a substitute for standard-dose CT in patients with/without chronic obstructive pulmonary disease.

Methods

Fifty patients (mean age, 69.2; mean % predicted FEV1, 79.4) underwent standard-dose CT (150mAs) and low-dose CT (25mAs). Except for tube current, the imaging parameters were identical for both protocols. Standard-dose CT was reconstructed using filtered back-projection (FBP), and low-dose CT was reconstructed using IR and FBP. For quantitative bronchial assessment, the wall area percentage (WA%) of the sub-segmental bronchi and the airway luminal volume percentage (LV%) from the main bronchus to the peripheral bronchi were acquired in each dataset. The correlation and agreement of WA% and LV% between standard-dose CT and both low-dose CTs were statistically evaluated.

Results

WA% and LV% between standard-dose CT and both low-dose CTs were significant correlated (r > 0.77, p < 0.00001); however, only the LV% agreement between SD-CT and low-dose CT reconstructed with IR was moderate (concordance correlation coefficient = 0.93); the other agreement was poor (concordance correlation coefficient <0.90).

Conclusions

Quantitative bronchial assessment via low-dose CT has potential as a substitute for standard-dose CT by using IR and airway luminal volumetry techniques.

Key points

• Quantitative bronchial assessment of COPD using low-dose CT is possible.
• Airway luminal volumetry with iterative reconstruction is insusceptible to dose reduction.
• Filtered back-projection is susceptible to the effect of dose reduction.
• Wall area percentage assessment is easily influenced by dose reduction.
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Metadata
Title
Iterative reconstruction technique vs filter back projection: utility for quantitative bronchial assessment on low-dose thin-section MDCT in patients with/without chronic obstructive pulmonary disease
Authors
Hisanobu Koyama
Yoshiharu Ohno
Mizuho Nishio
Sumiaki Matsumoto
Naoki Sugihara
Takeshi Yoshikawa
Shinichiro Seki
Kazuro Sugimura
Publication date
01-08-2014
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 8/2014
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-014-3207-9

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