Author(s)

Azusa Yamada¹, Satoko Kakino², Yuji Matsuura¹

¹Division of Oral Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
¹Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan.
²Division of Oral Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan.

Photoacoustic waves from hemoglobin solutions in dental roots are detected by using a 1064-nm laser and an ultrasonic soft probe based on a composite transducer on the tooth surface. The high-frequency ultrasonic waves are detected from a tooth with a hemoglobin solution in the pulp cavity due to the large heat transfer coefficient and absorption coefficient of hemoglobin. The spectral intensities of frequency components higher than 1 MHz show good correlation with the hemoglobin solution concentrations, and maps of frequency spectra calculated by taking short-time Fourier transforms clearly exhibit the effect of absorbance in dental pulp.

Photoacoustic Sensing, Dental Root, Hemoglobin Detection, Near Infrared Laser

Yamada, A. , Kakino, S. and Matsuura, Y. (2016) Detection of Photoacoustic Signals from Blood in Dental Pulp. Optics and Photonics Journal, 6, 229-236. doi: 10.4236/opj.2016.69024.