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01-07-2017 | Diagnostic Neuroradiology

Follow-up CT and CT angiography after intracranial aneurysm clipping and coiling—improved image quality by iterative metal artifact reduction

Authors: Georg Bier, Malte Niklas Bongers, Johann-Martin Hempel, Anja Örgel, Till-Karsten Hauser, Ulrike Ernemann, Florian Hennersdorf

Published in: Neuroradiology | Issue 7/2017

Abstract

Purpose

This paper aims to evaluate a new iterative metal artifact reduction algorithm for post-interventional evaluation of brain tissue and intracranial arteries.

Methods

The data of 20 patients that underwent follow-up cranial CT and cranial CT angiography after clipping or coiling of an intracranial aneurysm was retrospectively analyzed. After the images were processed using a novel iterative metal artifact reduction algorithm, images with and without metal artifact reduction were qualitatively evaluated by two readers, using a five-point Likert scale. Moreover, artifact strength was quantitatively assessed in terms of CT attenuation and standard deviation alterations.

Results

The qualitative analysis yielded a significant increase in image quality (p = 0.0057) in iteratively processed images with substantial inter-observer agreement (ĸ = 0.72), while the CTA image quality did not differ (p = 0.864) and even showed vessel contrast reduction in six cases (30%). The mean relative attenuation difference was 27% without metal artifact reduction vs. 11% for iterative metal artifact reduction images (p = 0.0003).

Conclusions

The new iterative metal artifact reduction algorithm enhances non-enhanced CT image quality after clipping or coiling, but in CT-angiography images, the contrast of adjacent vessels can be compromised.

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Title: Follow-up CT and CT angiography after intracranial aneurysm clipping and coiling—improved image quality by iterative metal artifact reduction
Authors: Georg Bier
Malte Niklas Bongers
Johann-Martin Hempel
Anja Örgel
Till-Karsten Hauser
Ulrike Ernemann
Florian Hennersdorf
Publication date: 01-07-2017
Publisher: Springer Berlin Heidelberg
Published in: Neuroradiology / Issue 7/2017
Print ISSN: 0028-3940
Electronic ISSN: 1432-1920
DOI: https://doi.org/10.1007/s00234-017-1855-6

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Follow-up CT and CT angiography after intracranial aneurysm clipping and coiling—improved image quality by iterative metal artifact reduction

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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