Document Detail

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.
MedLine Citation:
PMID:  17086407     Owner:  NLM     Status:  MEDLINE    
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.
Thorsten Ernstberger; Gabert Heidrich; Wolfgang Schultz; Eckhardt Grabbe
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2006-11-04
Journal Detail:
Title:  Neuroradiology     Volume:  49     ISSN:  0028-3940     ISO Abbreviation:  Neuroradiology     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-02-01     Completed Date:  2007-10-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1302751     Medline TA:  Neuroradiology     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  103-9     Citation Subset:  IM    
Department of Orthopaedic Surgery, University of Göttingen, Robert-Koch-Strasse 40, 37075 Göttingen, Germany.
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MeSH Terms
Chromium Alloys
Equipment Design
Internal Fixators*
Magnetic Resonance Imaging*
Spinal Fusion / instrumentation*
Thoracic Vertebrae*
Reg. No./Substance:
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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