Transparent ITO coated PVDF transducer for optoacoustic depth profiling

Niederhauser, J.J.; Jaeger, Michael; Hejazi, Marjaneh; Keppner, H.; Frenz, Martin

doi:10.1016/j.optcom.2005.05.005

Cited by 45 publications

(30 citation statements)

References 15 publications

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“…Note that a similar acoustic detection device was employed in Ref. [12]. The active area of the detector is circular with a diameter of 1 mm.…”

Section: Methodsmentioning

confidence: 99%

“…The 1D absorption profile contains information about the absorber concentration as well as its depth distribution. In this regard, acoustic near-field measurements by means of a transparent optoacoustic detector were shown to reproduce the depth profile of absorbed energy density and absorption coefficient without the need of extensive postprocessing [11], [12], [13], [14]. However, requiring close proximity (in the order of the lateral source extent) and plane wave symmetry, near-field conditions are unrealistic considering most measurement scenarios.…”

Section: Introductionmentioning

confidence: 99%

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Detection, numerical simulation and approximate inversion of optoacoustic signals generated in multi-layered PVA hydrogel based tissue phantoms

et al. 2016

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Optoacoustic (OA) measurements can not only be used for imaging purposes but as a more general tool to “sense” physical characteristics of biological tissue, such as geometric features and intrinsic optical properties. In order to pave the way for a systematic model-guided analysis of complex objects we devised numerical simulations in accordance with the experimental measurements. We validate our computational approach with experimental results observed for layered polyvinyl alcohol hydrogel samples, using melanin as the absorbing agent. Experimentally, we characterize the acoustic signal observed by a piezoelectric detector in the acoustic far-field in backward mode and we discuss the implication of acoustic diffraction on our measurements. We further attempt an inversion of an OA signal in the far-field approximation.

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“…Note that a similar acoustic detection device was employed in Ref. [12]. The active area of the detector is circular with a diameter of 1 mm.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection, numerical simulation and approximate inversion of optoacoustic signals generated in multi-layered PVA hydrogel based tissue phantoms

et al. 2016

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“…PZT transducers with openings at the center [20, 21] and transparent PVDF detectors using transparent indium-tin oxide surface electrodes [22] were created to reduce the obstruction to the optical path at the price of the reduced axial resolution or reduced sensitivity resulting from decreased bandwidth and detection angle [6, 23]. Besides, the limited detection angle also constrains the application of PZT transducers in laser-scan OR-PAM and PAT [24], which calls for wild-angle detection of ultrasound waves.…”

Section: Introductionmentioning

confidence: 99%

Optical Detection of Ultrasound in Photoacoustic Imaging

Dong¹,

Sun²,

Zhang

2017

IEEE Trans. Biomed. Eng.

141

116

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Objective Photoacoustic (PA) imaging emerges as a unique tool to study biological samples based on optical absorption contrast. In PA imaging, piezoelectric transducers are commonly used to detect laser-induced ultrasonic waves. However, they typically lack adequate broadband sensitivity at ultrasonic frequency higher than 100 MHz while their bulky size and optically opaque nature cause technical difficulties in integrating PA imaging with conventional optical imaging modalities. To overcome these limitations, optical methods of ultrasound detection were developed and shown their unique applications in photoacoustic imaging. Methods We provide an overview of recent technological advances in optical methods of ultrasound detection and their applications in PA imaging. A general theoretical framework describing sensitivity, bandwidth, and angular responses of optical ultrasound detection is also introduced. Results Optical methods of ultrasound detection can provide improved detection angle and sensitivity over significantly extended bandwidth. In addition, its versatile variants also offer additional advantages, such as device miniaturization, optical transparency, mechanical flexibility, minimal electrical/mechanical crosstalk, and potential noncontact PA imaging. Conclusion The optical ultrasound detection methods discussed in this review and their future evolution may play an important role in photoacoustic imaging for biomedical study and clinical diagnosis.

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“…The high capacity in combination with the resistance of the electric circuit operates like a high pass filter and important frequencies get lost. In general illumination through PVDF films is also not possible although Nierderhauser et al (Niederhauser et al, 2005) presented a transparent detector made of indium tin oxide (ITO). For an exact reconstruction one has to move the large area detector tangentially on the surface of a sphere enclosing the sample to collect data from all sides.…”

Section: Integrating Line Detectorsmentioning

confidence: 99%