Improvement in quantifying optical absorption coefficients based on continuous wavelet-transform by correcting distortions in temporal photoacoustic waveforms

Hirasawa, Takeshi; Fujita, Masanori; Okawa, Shinpei; Kubota, Toshihiro; Ishihara, Miya

doi:10.1117/12.2006305

Cited by 4 publications

(2 citation statements)

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“…It has been reported that mixtures of black ink and Intralipos (soybean oil emulsion) are used as artificial blood for the experiment of optical property. [17][18][19][20][21][22] We applied a solution composed of black ink (PILOT INK-350-B) and Intralipos (OTSUKA Intralipos injection 20%) that are used for simulating the absorption coefficient and scattering coefficient of human blood, respectively, to test the relationship between scattering propagation distance and the effective scattering coefficient. It is to be noted that the results from the solution cannot directly be compared with those from human blood because of the presence of particles of various sizes and refractivity.…”

Section: Optimization Of Patterned Mask Layoutmentioning

confidence: 99%

Near-infrared fundus camera with a patterned interference filter for the retinal scattering detection

Wang

Uemura

Takehara

et al. 2021

Jpn. J. Appl. Phys.

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The fundus camera is a system that enables retinal observations for the diagnosis of eye diseases. A near-infrared (NIR) multispectral fundus imaging system can capture color images using NIR light instead of visible light, thus avoiding irritation of the eyes and allowing for easier observations of the fundus. In this study, we developed an NIR fundus camera with a patterned metal mask for retinal patterned illumination. The pattern illuminated fundus images from the experiment prove the feasibility of retinal scattering detection using retinal patterned illumination. The layout of the patterned mask was optimized to prevent the interaction of scattered light and the multi-layer film structures of a patterned interference filter were proposed. The simulated transmission spectra showed that the transmittance of the linear stripe pattern, visual target, and fundus illumination are sufficiently high for the retinal patterned illumination.

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Section: Optimization Of Patterned Mask Layoutmentioning

confidence: 99%

Near-infrared fundus camera with a patterned interference filter for the retinal scattering detection

Wang

Uemura

Takehara

et al. 2021

Jpn. J. Appl. Phys.

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“…They later refined their methods by correcting distortions in temporal PA waveforms. 21,22 Li et al 23 used CWT for reconstruction of location and size of the optical absorber from noisy PA signals. Shao et al 24 proposed a method for approximate derivative calculation of PA analytic signals using CWT.…”

Section: Introductionmentioning

confidence: 99%

Computation of Photoacoustic Absorber Size from Deconvolved Photoacoustic Signal Using Estimated System Impulse Response

et al. 2020

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Photoacoustic signal recorded by photoacoustic imaging system can be modeled as convolution of initial photoacoustic response by the photoacoustic absorber with the system impulse response. Our goal was to compute the size of photoacoustic absorber using the initial photoacoustic response, deconvolved from the recorded photoacoustic data. For deconvolution, we proposed to use the impulse response of the photoacoustic system, estimated using discrete wavelet transform based homomorphic filtering. The proposed method was implemented on experimentally acquired photoacoustic data generated by different phantoms and also verified by a simulation study involving photoacoustic targets, identical to the phantoms in experimental study. The photoacoustic system impulse response, which was estimated using the acquired photoacoustic signal corresponding to a lead pencil, was used to extract initial photoacoustic response corresponding to a mustard seed of 0.65 mm radius. The recovered radius values of the mustard seed, corresponding to the experimental and simulation studies were 0.6 mm and 0.7 mm.

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Quantitative tissue characterization using discrete wavelet transform of photoacoustic signals: a feasibility study

Rathi

Sinha

2019

SIViP

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Improvement in quantifying optical absorption coefficients based on continuous wavelet-transform by correcting distortions in temporal photoacoustic waveforms

Cited by 4 publications

References 0 publications

Near-infrared fundus camera with a patterned interference filter for the retinal scattering detection

Near-infrared fundus camera with a patterned interference filter for the retinal scattering detection

Computation of Photoacoustic Absorber Size from Deconvolved Photoacoustic Signal Using Estimated System Impulse Response

Quantitative tissue characterization using discrete wavelet transform of photoacoustic signals: a feasibility study

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