Analysis of the photoacoustic spectral dispersion in dielectric colloids

Fuentes-Oliver, E. I.; Moock, Verena Margitta; Quispe-Siccha, Rosa; Fernández-Bienes, Alberto; García‐Segundo, C.

doi:10.1088/1402-4896/ac24b0

Cited by 2 publications

(4 citation statements)

References 28 publications

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“…Evaluation of the last integral in equation (11) yields Taking the inverse Fourier transform of the solution in the frequency domain gives rise to where > r R or > ¢ r r . There will be no photoacoustic waves if [4].…”

Section: By Using the Greens' Function Techniquementioning

confidence: 99%

“…The photoacoustic effect, which Alexander Graham Bell first presented in 1880, can be described as the formation of acoustic pressure waves resulting from the interaction of the short pulsed laser with a medium [1,2]. Developments in laser and ultrasonic transducer technologies have made Photoacoustic Imaging (PI) very popular in the last decades [2][3][4][5][6][7][8][9][10][11][12]. In PI, a very short pulsed laser with a pulse duration typically on the order of nanoseconds (or shorter) is sent to a sample to be imaged.…”

Section: Introductionmentioning

confidence: 99%

“…Using the following series expansion of the Bessel function of the first kind into equation(11) leads to…”

mentioning

confidence: 99%

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An analytical model to calculate the primary and secondary acoustic forces acting on microbubbles due to a short pulsed laser excitation

Erkol¹

2022

Phys. Scr.

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This work presents a comprehensive analytical approach to describe photoacoustic waves resulting from a pulsed laser excitation. The spatial part of the laser is modeled by a zeroth-order Bessel function of the first kind, which has a wide range of applications in optics and medical physics, such as optical trapping and nonlinear effects resulting from the interaction of a pulsed laser with tissue in photoacoustic imaging. The temporal part of the laser is described by a Gaussian function, which is a pretty realistic approximation since the interaction of the laser with the medium is instantaneous. The photoacoustic wave equation is solved analytically using the Fourier transform and the Greens’ function methods. The solution of the photoacoustic wave equation depends explicitly on position, time, pulse duration, and beam-width of the pulsed laser. The effects of these dependencies on the photoacoustic wave are investigated. Later, the primary and secondary radiation forces acting on microbubbles Albunex and Quantison are calculated using the magnitude of the photoacoustic pressure wave. The primary and secondary radiation forces decrease considerably with the distance from the photoacoustic absorber. These forces increase as the beam-width increases while they decrease as the pulse duration gets longer. The primary radiation forces on the microbubbles are on the order of nanonewtons. The force at this scale can be used to manipulate microbubbles. The secondary radiation force between identical microbubbles is in the range of piconewtons. Hence, this force can be used to determine the viscoelastic properties of microbubbles even though it is very small compared to the primary radiation force. The radiation forces determined by this work are also compared with those calculated by another study describing the laser’s spatial profile with a Gaussian function. The forces obtained by this work are larger than the forces determined by the Gaussian function approximation at the positions near the source. The forces obtained by the two approaches show similar behaviors, and they decrease remarkably with the distance from the source. Thus, the model presented in this work can be used to study the nonlinear mechanism in photoacoustics, such as enhancing image contrast and determining the tissue temperature. It can also be helpful for the applications of microbubbles in medical imaging and drug delivery as carriers.

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Section: By Using the Greens' Function Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An analytical model to calculate the primary and secondary acoustic forces acting on microbubbles due to a short pulsed laser excitation

Erkol¹

2022

Phys. Scr.

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“…Extensions of the standard wave model in PAT have also been considered and are presented in [6][7][8], for example.…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic inversion formulas using mixed data on finite time intervals*

Dreier

Haltmeier

2022

Inverse Problems

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We study the inverse source problem in photoacoustic tomography (PAT) for mixed data, which denote a weighted linear combination of the acoustic pressure and its normal derivative on an observation surface. We consider in particular the case where the data are only available on finite time intervals, which accounts for real-world usage of PAT where data are only feasible within a certain time interval. Extending our previous work, we derive explicit formulas up to a smoothing integral on convex domains with a smooth boundary, yielding exact reconstruction for circular or elliptical domains. We also present numerical reconstructions of our new exact inversion formulas on finite time intervals and compare them with the reconstructions of our previous formulas for unlimited time wave measurements.

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Analysis of the photoacoustic spectral dispersion in dielectric colloids

Cited by 2 publications

References 28 publications

An analytical model to calculate the primary and secondary acoustic forces acting on microbubbles due to a short pulsed laser excitation

An analytical model to calculate the primary and secondary acoustic forces acting on microbubbles due to a short pulsed laser excitation

Photoacoustic inversion formulas using mixed data on finite time intervals*

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