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European Radiology

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01-06-2012 | Cardiac

Effect of hybrid iterative reconstruction technique on quantitative and qualitative image analysis at 256-slice prospective gating cardiac CT

Authors: Daisuke Utsunomiya, Wm. Guy Weigold, Gaby Weissman, Allen J. Taylor

Published in: European Radiology | Issue 6/2012

Abstract

Objectives

To evaluate the effect of hybrid iterative reconstruction on qualitative and quantitative parameters at 256-slice cardiac CT.

Methods

Prospective cardiac CT images from 20 patients were analysed. Paired image sets were created using 3 reconstructions, i.e. filtered back projection (FBP) and moderate- and high-level iterative reconstructions. Quantitative parameters including CT-attenuation, noise, and contrast-to-noise ratio (CNR) were determined in both proximal- and distal coronary segments. Image quality was graded on a 4-point scale.

Results

Coronary CT attenuation values were similar for FBP, moderate- and high-level iterative reconstruction at 293 ± 74-, 290 ± 75-, and 283 ± 78 Hounsfield units (HU), respectively. CNR was significantly higher with moderate- and high-level iterative reconstructions (10.9 ± 3.5 and 18.4 ± 6.2, respectively) than FBP (8.2 ± 2.5) as was the visual grading of proximal vessels. Visualisation of distal vessels was better with high-level iterative reconstruction than FBP. The mean number of assessable segments among 289 segments was 245, 260, and 267 for FBP, moderate- and high-level iterative reconstruction, respectively; the difference between FBP and high-level iterative reconstruction was significant. Interobserver agreement was significantly higher for moderate- and high-level iterative reconstruction than FBP.

Conclusions

Cardiac CT using hybrid iterative reconstruction yields higher CNR and better image quality than FBP.

Key Points

• Cardiac CT helps clinicians to assess patients with coronary artery disease

• Hybrid iterative reconstruction provides improved cardiac CT image quality

• Hybrid iterative reconstruction improves the number of assessable coronary segments

• Hybrid iterative reconstruction improves interobserver agreement on cardiac CT

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Title: Effect of hybrid iterative reconstruction technique on quantitative and qualitative image analysis at 256-slice prospective gating cardiac CT
Authors: Daisuke Utsunomiya
Wm. Guy Weigold
Gaby Weissman
Allen J. Taylor
Publication date: 01-06-2012
Publisher: Springer-Verlag
Published in: European Radiology / Issue 6/2012
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-011-2361-6

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Effect of hybrid iterative reconstruction technique on quantitative and qualitative image analysis at 256-slice prospective gating cardiac CT

Abstract

Objectives

Methods

Results

Conclusions

Key Points

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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