| Implant detectibility of intervertebral disc spacers in post fusion MRI: evaluation of the MRI scan quality by using a scoring system--an in vitro study. | |
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MedLine Citation:
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PMID: 17086407 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: Intervertebral spacers for anterior spine fusion are made of different materials, such as titanium and cobalt chromium alloys and carbon fiber-reinforced polymers. Implant-related susceptibility artifacts can decrease the quality of MRI scans. The aim of this cadaveric study was to demonstrate the extent that implant-related MRI artifacting affects the postfusion differentiation of determined regions of interest (ROIs). METHODS: In six cadaveric porcine spines, we evaluated the postimplantation MRI scans of a titanium, cobalt-chromium and carbon spacer that differed in shape and surface qualities. A spacer made of human cortical bone was used as a control. A defined evaluation unit was divided into ROIs to characterize the spinal canal as well as the intervertebral disc space. Considering 15 different MRI sequences read independently by an interobserver-validated team of specialists the artifact-affected image quality of the median MRI slice was rated on a score of 0-3. A maximum score of 18 points (100%) for the determined ROIs was possible. RESULTS: Turbo spin echo sequences produced the best scores for all spacers and the control. Only the control achieved a score of 100%. For the determined ROI maximum scores for the cobalt-chromium, titanium and carbon spacers were 24%, 32% and 84%, respectively. CONCLUSION: By using favored T1 TSE sequences the carbon spacer showed a clear advantage in postfusion spinal imaging. Independent of artifact dimensions, the scoring system used allowed us to create an implant-related ranking of MRI scan quality in reference to the bone control. |
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Authors:
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Thorsten Ernstberger; Gabert Heidrich; Wolfgang Schultz; Eckhardt Grabbe |
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Publication Detail:
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Type: Comparative Study; Journal Article Date: 2006-11-04 |
Journal Detail:
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Title: Neuroradiology Volume: 49 ISSN: 0028-3940 ISO Abbreviation: Neuroradiology Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2007-02-01 Completed Date: 2007-10-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1302751 Medline TA: Neuroradiology Country: Germany |
Other Details:
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Languages: eng Pagination: 103-9 Citation Subset: IM |
Affiliation:
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Department of Orthopaedic Surgery, University of Göttingen, Robert-Koch-Strasse 40, 37075 Göttingen, Germany. ternstberger@med.uni-goettingen.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Artifacts* Cadaver Carbon Chromium Alloys Equipment Design Internal Fixators* Magnetic Resonance Imaging* Spinal Fusion / instrumentation* Swine Thoracic Vertebrae* Titanium |
| Chemical | |
Reg. No./Substance:
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0/Chromium Alloys; 0/carbon fiber; 12743-70-3/titanium alloy (TiAl6V4); 7440-32-6/Titanium; 7440-44-0/Carbon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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