Thermoacoustic tomography with integrating area and line detectors

Burgholzer, Peter; Höfer, Christian; Paltauf, Guenther; Haltmeier, Markus; Scherzer, Otmar

doi:10.1109/tuffc.2005.1516030

Cited by 122 publications

(120 citation statements)

References 24 publications

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“…Another part of the same laser pulse is frequency/wavelength converted by nonlinear optical processes and used for PA excitation. For image reconstruction in both modalities we use methods established for integrating detectors, where the sound waves are averaged over a detecting area with a size that exceeds the object dimension [28,29,32].…”

Section: Methodsmentioning

confidence: 99%

Hybrid photoacoustic and ultrasound section imaging with optical ultrasound detection

Nuster

Schmitner

Wurzinger

et al. 2013

Journal of Biophotonics

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Journal of BIOPHOTONICSA setup is proposed that provides perfectly co-registered photoacoustic (PA) and ultrasound (US) section images. Photoacoustic and ultrasound backscatter signals are generated by laser pulses coming from the same laser system, the latter by absorption of some of the laser energy on an optically absorbing target near the imaged object. By measuring both signals with the same optical detector, which is focused into the selected section by use of a cylindrical acoustic mirror, the information for both images is acquired simultaneously. Co-registered PA and US images are obtained after applying the inverse Radon transform to the data, which are gathered while rotating the object relative to the detector. Phantom experiments demonstrate a resolution of 1.1 mm between the sections of both imaging modalities and a inplane resolution of about 60 mm and 120 mm for the US and PA modes, respectively. The complementary contrast mechanisms of the two modalities are shown by images of a zebrafish.Result of the dual-modality section imaging experiment on a zebrafish. Scale bar: 1 mm. The first row shows the photoacoustic (PA) and the laser ultrasound (LUS) section image. The second row shows the fusion image (FI) and the histological section.

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Section: Methodsmentioning

confidence: 99%

Hybrid photoacoustic and ultrasound section imaging with optical ultrasound detection

Nuster

Schmitner

Wurzinger

et al. 2013

Journal of Biophotonics

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“…They showed the mathematical proof of integrating area and line detectors and introduced new reconstruction methods which are necessary when using such a detector. First measurements using an integrating detector were shown by (Burgholzer et al, 2005). The first integrating detector was an area detector which was bigger than the object in two dimensions.…”

Section: Photoacoustic Imagingmentioning

confidence: 99%

“…Line detectors around a sample rotated on one axis. Either one line detector is scanning around the object or a detector array is used Since the first measurement results from (Burgholzer et al, 2005) the integrating line detector was further improved in sensitivity and spatial resolution. Several types of such line detectors were implemented.…”

Section: Photoacoustic Imagingmentioning

confidence: 99%

Compensation of Ultrasound Attenuation in Photoacoustic Imaging

Burgholzer¹,

Roitner²,

Bauer-Marschallinger³

et al. 2011

Acoustic Waves - From Microdevices to Helioseismology

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“…However, by doing so, images cannot be acquired in real time. Alternatively, transducer arrays of piezoelectric materials [7,8] can be used. They enable numerically efficient and stable algorithms for thermoacoustic tomography.…”

Section: Introductionmentioning

confidence: 99%

Detection of laser induced dielectric breakdown in water using a laser doppler vibrometer

et al. 2010

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Abstract:This study is focused on exploring the feasibility of an all-optic surface scanning method in determining the size and position of a submerged, laser generated, optoacoustic (OA) source. The optoacoustic effect in this case was generated when the absorption of a short electromagnetic pulse in matter caused a dielectric breakdown, a plasma emission flash and a subsequent acoustic wave. In the experiment, a laser pulse with λ = 1064 nm and 12 ns pulse length was aimed at a volume of deionized water. When the laser beam was focused by a = 16 mm lens, a single dielectric breakdown spot occurred. When a = 40 mm was used several breakdowns in a row were induced. The breakdowns were photographed using a double shutter camera. The acoustic wave generated by the dielectric breakdowns were detected at a point on the water surface using a laser Doppler vibrometer (LDV). First, the LDV signal was used to calculate the speed of sound with an accuracy of 10 m/s. Secondly, the location and length of the dielectric breakdown was calculated with an accuracy of 1 mm. The calculated position matched the breakdown location recorded by a camera. The results show that it is possible to use LDV surface measurements from a single spot to determine both the position and length of the OA source as well as the speed of sound in the medium. Furthermore, the LDV measurements also show a secondary peak that originates from the OA source. To unravel the origin and properties of this interesting feature, further investigations are necessary.

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Thermoacoustic tomography with integrating area and line detectors

Cited by 122 publications

References 24 publications

Hybrid photoacoustic and ultrasound section imaging with optical ultrasound detection

Hybrid photoacoustic and ultrasound section imaging with optical ultrasound detection

Compensation of Ultrasound Attenuation in Photoacoustic Imaging

Detection of laser induced dielectric breakdown in water using a laser doppler vibrometer

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