Photoacoustic detection of blood in dental pulp by using short-time Fourier transform

Azusa Yamada, Satoko Kakino, Yuji Matsuura

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


A method based on photoacoustic analysis is proposed to diagnose dental pulp vitality. Photoacoustic analysis enables to get signal from deeper tissues than other optical analyses and therefore, signal detection from root canal of thick dental tissues such as molar teeth is expected. As a light source for excitation of photoacoustic waves, a microchip Q-switched YAG laser with a wavelength of 1064 nm was used and owing to large penetration depth of the near infrared laser, photoacoustic signals from dental root were successfully obtained. It was found that the photoacoustic signals from the teeth containing hemoglobin solution in the pulp cavity provide vibration in high frequency region. It was also shown that the intensities of the high frequency component have correlation with the hemoglobin concentration of solution. We applied short-time Fourier transform for evaluation of photoacoustic signals and this analysis clearly showed photoacoustic signals from dental root.

Original languageEnglish
Title of host publicationPhotons Plus Ultrasound
Subtitle of host publicationImaging and Sensing 2016
EditorsAlexander A. Oraevsky, Lihong V. Wang
ISBN (Electronic)9781628419429
Publication statusPublished - 2016
EventPhotons Plus Ultrasound: Imaging and Sensing 2016 - San Francisco, United States
Duration: 2016 Feb 142016 Feb 17

Publication series

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


ConferencePhotons Plus Ultrasound: Imaging and Sensing 2016
Country/TerritoryUnited States
CitySan Francisco


  • Photoacoustic analysis
  • dental diagnosis


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