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European Radiology

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31.10.2015 | Computed Tomography

Prior Image Constrained Compressed Sensing Metal Artifact Reduction (PICCS-MAR): 2D and 3D Image Quality Improvement with Hip Prostheses at CT Colonography

verfasst von: Peter Bannas, Yinsheng Li, Utaroh Motosugi, Ke Li, Meghan Lubner, Guang-Hong Chen, Perry J. Pickhardt

Erschienen in: European Radiology | Ausgabe 7/2016

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Abstract

Purpose

To assess the effect of the prior-image-constrained-compressed-sensing-based metal-artefact-reduction (PICCS-MAR) algorithm on streak artefact reduction and 2D and 3D-image quality improvement in patients with total hip arthroplasty (THA) undergoing CT colonography (CTC).

Materials and methods

PICCS-MAR was applied to filtered-back-projection (FBP)-reconstructed DICOM CTC-images in 52 patients with THA (unilateral, n = 30; bilateral, n = 22). For FBP and PICCS-MAR series, ROI-measurements of CT-numbers were obtained at predefined levels for fat, muscle, air, and the most severe artefact. Two radiologists independently reviewed 2D and 3D CTC-images and graded artefacts and image quality using a five-point-scale (1 = severe streak/no-diagnostic confidence, 5 = no streak/excellent image-quality, high-confidence). Results were compared using paired and unpaired t-tests and Wilcoxon signed-rank and Mann-Whitney-tests.

Results

Streak artefacts and image quality scores for FBP versus PICCS-MAR 2D-images (median: 1 vs. 3 and 2 vs. 3, respectively) and 3D images (median: 2 vs. 4 and 3 vs. 4, respectively) showed significant improvement after PICCS-MAR (all P < 0.001). PICCS-MAR significantly improved the accuracy of mean CT numbers for fat, muscle and the area with the most severe artefact (all P < 0.001).

Conclusions

PICCS-MAR substantially reduces streak artefacts related to THA on DICOM images, thereby enhancing visualization of anatomy on 2D and 3D CTC images and increasing diagnostic confidence.

Key Points

• PICCS-MAR significantly reduces streak artefacts associated with total hip arthroplasty on 2D and 3D CTC.

• PICCS-MAR significantly improves 2D and 3D CTC image quality and diagnostic confidence.

• PICCS-MAR can be applied retrospectively to DICOM images from single-kVp CT.

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Titel: Prior Image Constrained Compressed Sensing Metal Artifact Reduction (PICCS-MAR): 2D and 3D Image Quality Improvement with Hip Prostheses at CT Colonography
verfasst von: Peter Bannas
Yinsheng Li
Utaroh Motosugi
Ke Li
Meghan Lubner
Guang-Hong Chen
Perry J. Pickhardt
Publikationsdatum: 31.10.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: European Radiology / Ausgabe 7/2016
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-015-4044-1

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Prior Image Constrained Compressed Sensing Metal Artifact Reduction (PICCS-MAR): 2D and 3D Image Quality Improvement with Hip Prostheses at CT Colonography

Abstract

Purpose

Materials and methods

Results

Conclusions

Key Points

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Abstract

Purpose

Materials and methods

Results

Conclusions

Key Points

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