Value of monoenergetic dual-energy CT (DECT) for artefact reduction from metallic orthopedic implants in post-mortem studies

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• 作者：Laura Filograna ; Nicola Magarelli ; Antonio Leone ; Roman Guggenberger…
• 关键词：Dual ; energy computed tomography ; Monoenergetic extrapolation ; Metallic artefact reduction ; Forensic imaging ; Post ; mortem CT
• 刊名：Skeletal Radiology
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：44
• 期：9
• 页码：1287-1294
• 全文大小：733 KB
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• 作者单位：Laura Filograna (1) (3)
  Nicola Magarelli (3)
  Antonio Leone (3)
  Roman Guggenberger (2)
  Sebastian Winklhofer (2)
  Michael John Thali (1)
  Lorenzo Bonomo (3)
  
  1. Department of Forensic Medicine and Imaging, Institute of Forensic Medicine, University of Zurich, Winterthurerstrasse 190/52, 8057, Zurich, Switzerland
  3. Department of Radiological Sciences, Catholic University of Rome, School of Medicine, University Hospital “A. Gemelli- Largo A. Gemelli 8, 00168, Rome, Italy
  2. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Imaging and Radiology
  Orthopedics
  Pathology
  Nuclear Medicine
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2161

文摘

Objectives The aim of this ex vivo study was to assess the performance of monoenergetic dual-energy CT (DECT) reconstructions to reduce metal artefacts in bodies with orthopedic devices in comparison with standard single-energy CT (SECT) examinations in forensic imaging. Forensic and clinical impacts of this study are also discussed. Materials and methods Thirty metallic implants in 20 consecutive cadavers with metallic implants underwent both SECT and DECT with a clinically suitable scanning protocol. Extrapolated monoenergetic DECT images at 64, 69, 88, 105, 120, and 130?keV and individually adjusted monoenergy for optimized image quality (OPTkeV) were generated. Image quality of the seven monoenergetic images and of the corresponding SECT image was assessed qualitatively and quantitatively by visual rating and measurements of attenuation changes induced by streak artefact. Results Qualitative and quantitative analyses showed statistically significant differences between monoenergetic DECT extrapolated images and SECT, with improvements in diagnostic assessment in monoenergetic DECT at higher monoenergies. The mean value of OPTkeV was 137.6?±-.9 with a range of 130 to 148?keV. Conclusions This study demonstrates that monoenergetic DECT images extrapolated at high energy levels significantly reduce metallic artefacts from orthopedic implants and improve image quality compared to SECT examination in forensic imaging.