Optical measurements of eardrum vibrations and sound propagation in the ear canal for the fitting of active middle ear implants.
Laser-Doppler-Vibrometry (LDV)
ear canal acoustics
floating mass transducer (FMT)
middle ear implant
sound processor
Journal
Acta oto-laryngologica
ISSN: 1651-2251
Titre abrégé: Acta Otolaryngol
Pays: England
ID NLM: 0370354
Informations de publication
Date de publication:
Feb 2022
Feb 2022
Historique:
pubmed:
26
2
2022
medline:
30
3
2022
entrez:
25
2
2022
Statut:
ppublish
Résumé
Middle ear implants (MEI) are for the medical rehabilitation of the hearing function in case of sound conduction hearing losses as well as cochlear hearing losses and their combinations. An objective tool to reach the best fitting of the external worn sound processors is essential for patients who do not want or cannot participate in the fitting process. In addition to Laser-Doppler-Vibrometry (LDV) measurement, the sound pressure was measured distant to the eardrum to attain additional information for comparison. Three groups of patients with different middle ear characteristics were examined. Because of the large spreading of measuring results even within a patient group with similar eardrum and middle ear conditions it is difficult to develop characteristic diagrams which represent the mean values of eardrum displacements with different sound processor adjustments being the base for normative data courses. The LDV measurements can be used as a tool for fitting sound processors by finding individual maximum eardrum velocities in the frequency range 125 Hz to 8 kHz. In comparison to acoustical measurements the optical measurements have advantages concerning lower variations of measurement values, higher spectral resolution, and robustness against disturbing acoustic noise, especially at low frequencies.
Sections du résumé
BACKGROUND
BACKGROUND
Middle ear implants (MEI) are for the medical rehabilitation of the hearing function in case of sound conduction hearing losses as well as cochlear hearing losses and their combinations.
OBJECTIVES
OBJECTIVE
An objective tool to reach the best fitting of the external worn sound processors is essential for patients who do not want or cannot participate in the fitting process.
METHODS
METHODS
In addition to Laser-Doppler-Vibrometry (LDV) measurement, the sound pressure was measured distant to the eardrum to attain additional information for comparison. Three groups of patients with different middle ear characteristics were examined.
RESULTS
RESULTS
Because of the large spreading of measuring results even within a patient group with similar eardrum and middle ear conditions it is difficult to develop characteristic diagrams which represent the mean values of eardrum displacements with different sound processor adjustments being the base for normative data courses.
CONCLUSIONS AND SIGNIFICANCE
CONCLUSIONS
The LDV measurements can be used as a tool for fitting sound processors by finding individual maximum eardrum velocities in the frequency range 125 Hz to 8 kHz. In comparison to acoustical measurements the optical measurements have advantages concerning lower variations of measurement values, higher spectral resolution, and robustness against disturbing acoustic noise, especially at low frequencies.
Identifiants
pubmed: 35209792
doi: 10.1080/00016489.2022.2038388
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM