title: Quantification of effective attenuation coefficients using continuous wavelet transform of photoacoustic signals.
abstract: A method for quantifying the effective attenuation coefficients of optical absorbers by using the continuous wavelet transform (CWT) to calculate the time-resolved frequency spectra of photoacoustic signals is proposed. Because the coefficients can be quantified according to the relative intensity of the frequency content of the signals, it is unnecessary to determine the fluences. A computational simulation reveals that the time-resolved frequency spectra exhibit better correlation with the coefficients than do power spectra calculated using a Fourier transformation. The CWT-based method was experimentally verified, and the coefficients were quantified with mean square error of 2.0  cm(-1).
authors: Takeshi
authors: T
authors: Hirasawa
authors: Masanori
authors: M
authors: Fujita
authors: Shinpei
authors: S
authors: Okawa
authors: Toshihiro
authors: T
authors: Kushibiki
authors: Miya
authors: M
authors: Ishihara
mesh_terms: D000465:Algorithms; D054459:Elasticity Imaging Techniques / Q000379:methods*; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D061088:Photoacoustic Techniques / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D058067:Wavelet Analysis