Quantification of effective attenuation coefficients using continuous wavelet transform of photoacoustic signals

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 o...

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Bibliographic Details
Published in:Applied optics (2004) 2013-12, Vol.52 (35), p.8562-3
Main Authors: Hirasawa, Takeshi, Fujita, Masanori, Okawa, Shinpei, Kushibiki, Toshihiro, Ishihara, Miya
Format: Article
Language:English
Subjects:
Algorithms
Attenuation coefficients
Computer simulation
Continuous wavelet transform
Elasticity Imaging Techniques - methods
Fourier transformation
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Mathematical analysis
Mean square values
Photoacoustic Techniques - methods
Power spectra
Reproducibility of Results
Sensitivity and Specificity
Spectra
Wavelet Analysis
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Description
Summary: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).
ISSN:1559-128X
2155-3165
DOI:10.1364/ao.52.008562