gms | German Medical Science

78. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V.

Deutsche Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V.

16.05. - 20.05.2007, München

Scanning acoustic microscopy of human auditory ossicles affected by otitis media

Meeting Abstract

  • corresponding author Silke Burkert - ENT-Hospital, Halle, Germany
  • Susanne Liebhold - Klinik St. Elisabth und Barbara, Halle, Germany
  • Jörg Brandt - Hospital of Orthopaedics, Halle, Germany
  • Ernst-Juergen Haberland - ENT-Hospital, Halle, Germany
  • Kerstin Neumann - ENT-Hospital, Halle, Germany

German Society of Oto-Rhino-Laryngology, Head and Neck Surgery. 78th Annual Meeting of the German Society of Oto-Rhino-Laryngology, Head and Neck Surgery. Munich, 16.-20.05.2007. Düsseldorf, Köln: German Medical Science; 2007. Doc07hno050

Die elektronische Version dieses Artikels ist vollständig und ist verfügbar unter: http://www.egms.de/de/meetings/hno2007/07hno050.shtml

Veröffentlicht: 8. August 2007

© 2007 Burkert et al.
Dieser Artikel ist ein Open Access-Artikel und steht unter den Creative Commons Lizenzbedingungen (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.de). Er darf vervielf&aauml;ltigt, verbreitet und &oauml;ffentlich zug&aauml;nglich gemacht werden, vorausgesetzt dass Autor und Quelle genannt werden.


Gliederung

Text

Introduction: Scanning Acoustic Microscopy (SAM) is a powerful technique for structure analysis of ear ossicles. The picture-contrast in SAM originates from local differences of the acoustic impedance Z,. A relevant advantage of SAM lies in the two-dimensional illustration of morphological structures. Resolution can be adjusted almost continuously. SAM has considerable advantages compared to nanoindentation. The measurements are non-destructive and repeatable. Two dimensional surface area can be investigated, instead of discrete point. Topographical influences in high frequency measurements are compensated by the use of multi-layer-technique.

Methods: In the present study, the coustic impedance in slices of human ear ossicles affected by cholesteatoma and chronic otitis media mesotympanalis were measured. Measurements were done with the scanning acoustic microscopes KSI SAM 100 and KSI SAM 2000 (Kraemer Scientific Instruments GmbH, Herborn, Germany) at 50 MHz and 200 MHz. The distribution of acoustic impedance of 13 affected mallei and 15 affected inci were measured. The impedance-picture showed the destruction of the normal bone-structure in cholesteatoma with low acoustic impedance (incus: 7,45 ± 0,47 Mrayl,; malleus: 7,39 ± 0,57 Mrayl; normal: 8 Mrayl).

Conclusion: SAM provides unique information with regard to in vitro elastic tissue properties of human ear ossicles affectedby chronic otitis media. The results may contribute to a better understanding of changes of normal structure and conducting hearing loss caused by chronic otitis media.From this standpoint don’t take any affected ossicel for tympanoplasty!.


References

1.
Burkert S, Haberland EJ, Raum K, Klemenz A, Brandt J, Berghaus A. Tissue characterization of human auditory ossicles by scanning acoustic microscopy. IEEE. 2002:1273-76. ISBN 0-7803-7583-1.
2.
Burkert S, Liebhold S, Haberland EJ, Raum K, Brandt J, Bloching M. Scanning Acoustic Microscopy of Human Septal Cartilage. Journal of Technology and Health Care. IOS Press. 2003. ISSN 0928-7329.
3.
Raum K, Brandt J, Klemenza A, Cobet U. Quantitative Ultraschallrastermikroskopie zur Bestimmung der akustischen Impedanz von kortikalem Knochengewebe. Z Med Phys. 1999;9:246-53.