Photoacoustic projection imaging using a 64-channel fiber optic detector array

Bauer-Marschallinger, Johannes; Felbermayer, Karoline; Bouchal, Klaus-Dieter; Veres, István A.; Grün, Hubert; Burgholzer, Peter; Berer, Thomas

doi:10.1117/12.2077206

Cited by 11 publications

(13 citation statements)

References 27 publications

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“…3f [62]. 3D reconstruction can be obtained by rotating the sample and acquiring 2D projections at different angles [64]. On the other hand, fiber-optics FPIs can be made to have small element sizes.…”

Section: Optical Ultrasound Detectors and Applicationsmentioning

confidence: 99%

Optical Detection of Ultrasound in Photoacoustic Imaging

Dong¹,

Sun²,

Zhang

2017

IEEE Trans. Biomed. Eng.

137

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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Section: Optical Ultrasound Detectors and Applicationsmentioning

confidence: 99%

Optical Detection of Ultrasound in Photoacoustic Imaging

Dong¹,

Sun²,

Zhang

2017

IEEE Trans. Biomed. Eng.

137

116

View full text Add to dashboard Cite

show abstract

“…However, temporal samples can easily be collected at a high sampling rate compared to the spatial sampling, where each sample requires a separate sensor. It is therefore natural to consider the semi-discrete data model (2). Our compressed PAT scheme could easily be adapted to a fully discretized data model.…”

Section: Photoacoustic Tomography (Pat)mentioning

confidence: 99%

A Novel Compressed Sensing Scheme for Photoacoustic Tomography

Sandbichler¹,

Krahmer²,

Berer³

et al. 2015

SIAM J. Appl. Math.

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Speeding up the data acquisition is one of the central aims to advance tomographic imaging. On the one hand, this reduces motion artifacts due to undesired movements, and on the other hand this decreases the examination time for the patient. In this article, we propose a new scheme for speeding up the data collection process in photoacoustic tomography. Our proposal is based on compressed sensing and reduces acquisition time and system costs while maintaining image quality. As measurement data we use random combinations of pressure values that we use to recover a complete set of pressure data prior to the actual image reconstruction. We obtain theoretical recovery guarantees for our compressed sensing scheme and support the theory by reconstruction results on simulated data as well as on experimental data.

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“…In [22] we demonstrated the feasibility to read-out the signals from 16 fiber-optic detection channels in parallel. We are planning to extend our detector array to at least 8 rings, whereby the ring diameters should be optimized for imaging depths between 5 mm and 50 mm.…”

Section: Discussionmentioning

confidence: 99%

Fiber-optic annular detector array for large depth of field photoacoustic macroscopy

et al. 2017

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We report on a novel imaging system for large depth of field photoacoustic scanning macroscopy. Instead of commonly used piezoelectric transducers, fiber-optic based ultrasound detection is applied. The optical fibers are shaped into rings and mainly receive ultrasonic signals stemming from the ring symmetry axes. Four concentric fiber-optic rings with varying diameters are used in order to increase the image quality. Imaging artifacts, originating from the off-axis sensitivity of the rings, are reduced by coherence weighting. We discuss the working principle of the system and present experimental results on tissue mimicking phantoms. The lateral resolution is estimated to be below 200 μm at a depth of 1.5 cm and below 230 μm at a depth of 4.5 cm. The minimum detectable pressure is in the order of 3 Pa. The introduced method has the potential to provide larger imaging depths than acoustic resolution photoacoustic microscopy and an imaging resolution similar to that of photoacoustic computed tomography.

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Photoacoustic projection imaging using a 64-channel fiber optic detector array

Cited by 11 publications

References 27 publications

Optical Detection of Ultrasound in Photoacoustic Imaging

Optical Detection of Ultrasound in Photoacoustic Imaging

A Novel Compressed Sensing Scheme for Photoacoustic Tomography

Fiber-optic annular detector array for large depth of field photoacoustic macroscopy

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