Towards non-contact photo-acoustic endoscopy using speckle pattern analysis

Benjamin Lengenfelder, Fanuel Mehari, Yuqi Tang, Florian Klämpfl, Zeev Zalevsky, Michael Schmidt

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


Photoacoustic Tomography combines the advantages of optical and acoustic imaging as it makes use of the high optical contrast of tissue and the high resolution of ultrasound. Furthermore, high penetration depths in tissue in the order of several centimeters can be achieved by the combination of these modalities. Extensive research is being done in the field of miniaturization of photoacoustic devices, as photoacoustic imaging could be of significant benefits for the physician during endoscopic interventions. All the existing miniature systems are based on contact transducers for signal detection that are placed at the distal end of an endoscopic device. This makes the manufacturing process difficult and impedance matching to the inspected surface a requirement. The requirement for contact limits the view of the physician during the intervention. Consequently, a fiber based non-contact optical sensing technique would be highly beneficial for the development of miniaturized photoacoustic endoscopic devices. This work demonstrates the feasibility of surface displacement detection using remote speckle-sensing using a high speed camera and an imaging fiber bundle that is used in commercially available video endoscopes. The feasibility of displacement sensing is demonstrated by analysis of phantom vibrations which are induced by loudspeaker membrane oscillations. Since the usability of the remote speckle-sensing for photo-acoustic signal detection was already demonstrated, the fiber bundle approach demonstrates the potential for non-contact photoacoustic detections during endoscopy.

Original languageEnglish
Title of host publicationPhotons Plus Ultrasound
Subtitle of host publicationImaging and Sensing 2017
EditorsAlexander A. Oraevsky, Lihong V. Wang
ISBN (Electronic)9781510605695
StatePublished - 2017
EventPhotons Plus Ultrasound: Imaging and Sensing 2017 - San Francisco, United States
Duration: 29 Jan 20171 Feb 2017

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferencePhotons Plus Ultrasound: Imaging and Sensing 2017
Country/TerritoryUnited States
CitySan Francisco

Bibliographical note

Publisher Copyright:
© 2017 SPIE.


  • Endoscopy
  • Photoacoustic
  • Speckle Sensing


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