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01-04-2013 | Computed Tomography

Iterative reconstruction improves evaluation of native aortic and mitral valves by retrospectively ECG-gated thoracoabdominal CTA

Authors: Martin J. Willemink, Jesse Habets, Pim A. de Jong, Arnold M. R. Schilham, Willem P. Th. M. Mali, Tim Leiner, Ricardo P. J. Budde

Published in: European Radiology | Issue 4/2013

Abstract

Objectives

To compare native aortic (AV) and mitral valve (MV) image quality on limited-dose retrospectively ECG-gated CTA of the thoracoabdominal aorta reconstructed with iterative reconstruction (IR) and filtered back projection (FBP).

Methods

Fifty patients underwent routine care retrospectively ECG-gated thoracoabdominal limited-dose 256-slice CTA. At 30 % (systole) and 75 % (diastole) of the R-R interval AV and MV were reconstructed using FBP and IR. Objective image quality [density and noise (SD of density measurement)] was measured. Two independent observers scored subjective valve image quality using four-point Likert scales.

Results

IR significantly decreased image noise, but did not alter the aorta and interventricular septum density. Interobserver variability was moderate to good. Valve image quality was scored at least moderate in most cases. IR scored one or two Likert scale points higher than FBP in 10 (first observer) and 27 (second observer) scores. Conversely, IR scored one Likert scale point lower than FBP in 1 (first observer) and 4 (second observer) scores.

Conclusions

Limited-dose retrospectively ECG-gated thoracoabdominal CTA enables moderate to excellent evaluation of AV and MV in most patients, in addition to the primary diagnostic question. Image quality is further improved by IR.

Key Points

• Thoracoabdominal computed tomographic angiography demonstrates both the aortic and mitral valves.

• Iterative reconstruction decreases image noise and increases the SNR/CNR of thoracoabdominal CTA.

• Limited-dose retrospectively gated CTA enables moderate–excellent left-sided valvular evaluation.

• Iterative CT image reconstruction improves subjective native aortic and mitral valvular evaluation.

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Title: Iterative reconstruction improves evaluation of native aortic and mitral valves by retrospectively ECG-gated thoracoabdominal CTA
Authors: Martin J. Willemink
Jesse Habets
Pim A. de Jong
Arnold M. R. Schilham
Willem P. Th. M. Mali
Tim Leiner
Ricardo P. J. Budde
Publication date: 01-04-2013
Publisher: Springer-Verlag
Published in: European Radiology / Issue 4/2013
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-012-2673-1

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Iterative reconstruction improves evaluation of native aortic and mitral valves by retrospectively ECG-gated thoracoabdominal CTA

Abstract

Objectives

Methods

Results

Conclusions

Key Points

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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