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01-09-2017 | Computed Tomography

Improvement of image quality and dose management in CT fluoroscopy by iterative 3D image reconstruction

Authors: Oliver S. Grosser, Christian Wybranski, Dennis Kupitz, Maciej Powerski, Konrad Mohnike, Maciej Pech, Holger Amthauer, Jens Ricke

Published in: European Radiology | Issue 9/2017

Abstract

Objectives

The objective of this study was to assess the influence of an iterative CT reconstruction algorithm (IA), newly available for CT-fluoroscopy (CTF), on image noise, readers’ confidence and effective dose compared to filtered back projection (FBP).

Methods

Data from 165 patients (FBP/IA = 82/74) with CTF in the thorax, abdomen and pelvis were included. Noise was analysed in a large-diameter vessel. The impact of reconstruction and variables (e.g. X-ray tube current I) influencing noise and effective dose were analysed by ANOVA and a pairwise t-test with Bonferroni–Holm correction. Noise and readers’ confidence were evaluated by three readers.

Results

Noise was significantly influenced by reconstruction, I, body region and circumference (all p ≤ 0.0002). IA reduced the noise significantly compared to FBP (p = 0.02). The effect varied for body regions and circumferences (p ≤ 0.001). The effective dose was influenced by the reconstruction, body region, interventional procedure and I (all p ≤ 0.02). The inter-rater reliability for noise and readers’ confidence was good (W ≥ 0.75, p < 0.0001). Noise and readers’ confidence were significantly better in AIDR-3D compared to FBP (p ≤ 0.03). Generally, IA yielded a significant reduction of the median effective dose.

Conclusion

The CTF reconstruction by IA showed a significant reduction in noise and effective dose while readers’ confidence increased.

Key Points

• CTF is performed for image guidance in interventional radiology.

• Patient exposure was estimated from DLP documented by the CT.

• Iterative CT reconstruction is appropriate to reduce image noise in CTF.

• Using iterative CT reconstruction, the effective dose was significantly reduced in abdominal interventions.

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Title: Improvement of image quality and dose management in CT fluoroscopy by iterative 3D image reconstruction
Authors: Oliver S. Grosser
Christian Wybranski
Dennis Kupitz
Maciej Powerski
Konrad Mohnike
Maciej Pech
Holger Amthauer
Jens Ricke
Publication date: 01-09-2017
Publisher: Springer Berlin Heidelberg
Published in: European Radiology / Issue 9/2017
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-017-4754-7

At a glance: The STEP trials

Springer Medicine

Improvement of image quality and dose management in CT fluoroscopy by iterative 3D image reconstruction

Abstract

Objectives

Methods

Results

Conclusion

Key Points

At a glance: The STEP trials

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusion

Key Points

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