Abstract
Objectives
Modern passive middle ear titanium prostheses are filigree structures, resulting in poorer depiction on CT compared to prostheses used in the past. We compared the visibility of newer prostheses on cone beam CT (CBCT) to multi-detector CT (MDCT) with standard and lower dose in vitro, and analysed image noise and metal artefacts.
Methods
Six different titanium middle ear prostheses (three partial and one total ossicular replacement prostheses, two stapes prostheses) were implanted twice in formalin-fixed head specimens—first correctly and then with displacement. Imaging was performed using standard CBCT and MDCT as well as MDCT with lower dose (36 single imaging investigations). Images were analysed with knowledge of the used types of middle ear prostheses, but blinded with respect to the positioning in the specific case.
Results
On all images the type of prostheses and their positions could be clearly recognized. Their identifiability including their details was rated as statistically significantly higher for all CBCT investigations than for MDCT. MDCT with lower dose showed the worst results. No statistical differences were found in image noise and metal artefacts.
Conclusions
If available, CBCT should be preferred over MDCT in diagnostic evaluation of passive middle ear prostheses.
Key Points
• Middle ear prostheses became more filigree, leading to poorer visibility on CT.
• High spatial resolution and paraxial reconstructions are necessary requirements for imaging evaluation.
• CBCT and MDCT can identify type and positioning of titanium prostheses.
• Metal artefacts play a minor part in filigree titanium prostheses.
• Regarding visualisation of prostheses details, cone beam CT aids the evaluation.
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Abbreviations
- CBCT:
-
cone beam CT
- MDCT:
-
multi-detector CT
- MIP:
-
maximum intensity projection
- MPR:
-
multi-planar reconstruction
- PORP:
-
partial ossicular replacement prosthesis
- TORP:
-
total ossicular replacement prosthesis
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Acknowledgments
The study was partially supported by Heinz Kurz GmbH Medizintechnik (Dusslingen, Germany) which provided the passive titanium middle ear prostheses and by Vibrant MedEl (Innsbruck, Austria) which supported the transport of the specimens between the Department of Anatomy and the imaging department. The authors themselves did not receive any financial support.
We thank the Department of Anatomy of the Martin-Luther-University Halle-Wittenberg (Director: Prof. Dr. med. Dr. agr. Bernd Fischer) for providing the specimens, Mrs. Jana Gräfenhain and Mr. Hans-Joachim Heine for their assistance in the Anatomy Laboratory and radiographers Mrs. A. Winkler and Mrs. M Beer for their technical support with the radiological imaging.
The scientific guarantor of this publication is Thi Dao Nguyen. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. No complex statistical methods were necessary for this paper. Additional institutional review board approval was not required because the investigations were made on human heads from human donors to the University Institute of Anatomy for academic use. Written informed consent was not required for this study because the investigations were made on human heads from human donors to the University Institute of Anatomy for academic use. Methodology: prospective, diagnostic study/experimental, performed at one institution.
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Nguyen, T.D., Kösling, S., Mlynski, R. et al. Visualisation of passive middle ear implants by cone beam and multi-detector computed tomography: a comparative in vitro study. Eur Radiol 26, 4538–4544 (2016). https://doi.org/10.1007/s00330-016-4312-8
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DOI: https://doi.org/10.1007/s00330-016-4312-8