Focused array transducer for two-dimensional optoacoustic tomography

Kozhushko, V. V.; Khokhlova, Tanya D.; Zharinov, A. N.; Pelivanov, Ivan; Solomatin, Vladimir S; Karabutov, Alexander A.

doi:10.1121/1.1781710

Cited by 41 publications

(25 citation statements)

References 18 publications

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“…This problem can be overcome using ultra wide-band piezoelectric transducers designed specifically for OA signals. [14][15][16][17] Transducers constructed from polyvinylidene fluoride (PVDF) films of varying thickness operating in an open circuit regime 14 represent the gold standard for ultra wideband detection, even producing bandwidths approaching 150 MHz. Other contact approaches have been used which may approach the performance of PVDF transducers.…”

Section: Introductionmentioning

confidence: 99%

A new fiber-optic non-contact compact laser-ultrasound scanner for fast non-destructive testing and evaluation of aircraft composites

Pelivanov¹,

Buma²,

Xia³

et al. 2014

Journal of Applied Physics

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Laser ultrasonic (LU) inspection represents an attractive, non-contact method to evaluate composite materials. Current non-contact systems, however, have relatively low sensitivity compared to contact piezoelectric detection. They are also difficult to adjust, very expensive, and strongly influenced by environmental noise. Here, we demonstrate that most of these drawbacks can be eliminated by combining a new generation of compact, inexpensive fiber lasers with new developments in fiber telecommunication optics and an optimally designed balanced probe scheme. In particular, a new type of a balanced fiber-optic Sagnac interferometer is presented as part of an all-optical LU pump-probe system for non-destructive testing and evaluation of aircraft composites. The performance of the LU system is demonstrated on a composite sample with known defects. Wide-band ultrasound probe signals are generated directly at the sample surface with a pulsed fiber laser delivering nanosecond laser pulses at a repetition rate up to 76 kHz rate with a pulse energy of 0.6 mJ. A balanced fiber-optic Sagnac interferometer is employed to detect pressure signals at the same point on the composite surface. A-and B-scans obtained with the Sagnac interferometer are compared to those made with a contact wide-band polyvinylidene fluoride transducer. V C 2014 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

A new fiber-optic non-contact compact laser-ultrasound scanner for fast non-destructive testing and evaluation of aircraft composites

Pelivanov¹,

Buma²,

Xia³

et al. 2014

Journal of Applied Physics

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“…4). The method of the point spread function measurement is described in details in [6,7,11]. By means of the point spread function, the lateral resolution ∆z in the image plane XZ can be determined.…”

Section: Experimental Casesmentioning

confidence: 99%

“…The focused transducer sensitivity is distributed in a narrow focal region. Consequently, the sensitivity of the entire antenna is located in the image plane [7].…”

Section: Introductionmentioning

confidence: 99%

Wideband focused transducer array for optoacoustic tomography

2009

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Abstract:In this work, a multi-element transducer has been developed for the optoacoustic tomography of biological objects with a given spatial resolution in three dimensions (axial resolution in the image plane was ∆x = 0.1 mm, lateral resolution in the image plane was ∆z = 1.6 mm, lateral resolution in the plane perpendicular to the image plane was ∆y = 0.5 mm). The transducer consists of a set of 8 linear PVDF piezoelectric films (width is 2 mm) located in a plane with 1-mm gap and focused by a cylindrical acoustic lens. Map of the transducer focal area has been experimentally investigated. The resolution ∆y was obtained from the map and is equal to 0.5 mm. Image of a focused point source has been rendered based on experimentally obtained optoacoustic signals. The x-axis resolution and the z-axis resolution were calculated from the focused point source image reconstructed using a back-projection algorithm and are equal to 0.1 mm and 2 mm respectively.

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“…Ultrasound transducer arrays with linear [2][3][4][5][6][7] and curved 8,9 geometries have been employed for PAT imaging to reduce imaging times and address clinical applications. The majority of these systems, however, have been optimized for imaging of human subjects ͑large size and field of view, low operating frequencies͒ or limited to phantom studies.…”

Section: Introductionmentioning

confidence: 99%

Curved array photoacoustic tomographic system for small animal imaging

Gamelin¹,

Aguirre²,

Maurudis³

et al. 2008

J. Biomed. Opt.

119

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Abstract. We present systematic characterization of a photoacoustic imaging system optimized for rapid, high-resolution tomographic imaging of small animals. The system is based on a 128-element ultrasonic transducer array with a 5-MHz center frequency and 80% bandwidth shaped to a quarter circle of 25 mm radius. A 16-channel dataacquisition module and dedicated channel detection electronics enable capture of a 90-deg field-of-view image in less than 1 s and a complete 360-deg scan using sample rotation within 15 s. Measurements on cylindrical phantom targets demonstrate a resolution of better than 200 m and high-sensitivity detection of 580-m blood tubing to depths greater than 3 cm in a turbid medium with reduced scattering coefficient s Ј=7.8 cm −1 . The system is used to systematically investigate the effects of target size, orientation, and geometry on tomographic imaging. As a demonstration of these effects and the system imaging capabilities, we present tomographic photoacoustic images of the brain vasculature of an ex vivo mouse with varying measurement aperture. For the first time, according to our knowledge, resolution of sub-200-m vessels with an overlying turbid medium of greater than 2 cm depth is demonstrated using only intrinsic biological contrast.

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Focused array transducer for two-dimensional optoacoustic tomography

Cited by 41 publications

References 18 publications

A new fiber-optic non-contact compact laser-ultrasound scanner for fast non-destructive testing and evaluation of aircraft composites

A new fiber-optic non-contact compact laser-ultrasound scanner for fast non-destructive testing and evaluation of aircraft composites

Wideband focused transducer array for optoacoustic tomography

Curved array photoacoustic tomographic system for small animal imaging

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