Ultrasonics

Journal: Ultrasonics

Abbreviation

Ultrasonics

Publisher

Elsevier

ISSN

0041-624X
1874-9968

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Publications 1 - 10 of 34

Improving axial resolution uniformity in deep-tissue optoacoustic imaging via entropy-driven design of dual-frequency multi-segment arrays
Cheng , Weixia; Zhang , Ruochong; Ciobanu , Cristian; et al. (2026)
Ultrasonics
Dual-frequency or multi-frequency transducers have been proposed to balance deep penetration and high resolution in optoacoustic (OA) imaging, based on the well-established tradeoff that low frequencies provide deeper penetration, while high frequencies offer higher resolution. In practice, conventional transducer designs are primarily guided by the signal’s center frequency and bandwidth, as these parameters fundamentally constrain spatial resolution. However, such criteria alone are insufficient, as they overlook the influence of transducer geometry within the array. To address this limitation, we introduce k-space analysis and a weighted entropy ( W E ) metric that links transducer design parameters to directional resolution performance. Simulations and phantom experiments validated that the dual-frequency multi-segment transducer array (DF-MSTA), combining 3 and 7.5 MHz, achieved more uniform and enhanced axial resolution (by up to 23.8 %), compared to a single-frequency MSTA operating at 7.5 MHz. The results align with predictions from the k-space analysis and W E quantification. This work provides a transducer design strategy that jointly considers frequency selection and array geometry, along with a quantitative framework to optimize axial resolution in deep-tissue OA imaging, offering insights beyond conventional approaches.
Ultrawideband sub-pascal sensitivity piezopolymer detectors
Kurnikov, Alexey; Sanin, Anatoly; Dean Ben, Xose Luis; et al. (2024)
Ultrasonics
Piezoelectric detectors are integral part of modern ultrasound imaging systems. Their utility has also been extended beyond the established methodologies into the emerging realm of hybrid optoacoustic imaging. Conventional piezoceramic detectors, however, struggle to combine high detection sensitivity with ultrawide bandwidth, both considered critical for attaining optimal optoacoustic imaging performance. Our research, both theoretical and empirical, unveils that damped piezopolymer detectors fabricated from PVDF-TrFE are markedly capable of achieving a synergistic blend between broad bandwidth and superb sensitivity. Experimental evaluations reflected an average sensitivity of 15.5 µV/Pa within a 1–10 MHz band for a 120 µm thick detector and 6.4 µV/Pa within a 1–30 MHz band for a 20 µm thick detector, thus outperforming conventional piezoelectric analogues. The resultant noise equivalent pressure (NEPs) values were 0.3 Pa and 1.2 Pa for the 20 µm and 120 µm detectors, respectively. Our findings herald a significant stride towards enhancing the efficacy of ultrawideband ultrasound and optoacoustic imaging systems.
Strategies for single particle manipulation using acoustic and flow fields
Oberti, Stefano; Möller, Dirk; Neild, Adrian; et al. (2010)
Ultrasonics
Optimization of receiver arrangements for passive emitter localization methods
Flückiger, Michael; Neild, Adrian P.; Nelson, Bradley J. (2012)
Ultrasonics
Longitudinal ultrasonic vibration assisted guillotining of stacked paper
Deibel, Karl-Robert; Kaiser, Fabian; Zimmermann, Remo; et al. (2014)
Ultrasonics
Active fiber composites for the generation of Lamb waves
Birchmeier, M.; Gsell, D.; Juon, M.; et al. (2009)
Ultrasonics
Non-destructive evaluation of elastic material properties in anisotropic circular cylindrical structures
Gsell, Daniel; Dual, Jürg (2004)
Ultrasonics
Wave propagation in a wooden bar
Veres, István A.; Sayir, Mahir B. (2004)
Ultrasonics
Theoretical and numerical calculation of the acoustic radiation force acting on a circular rigid cylinder near a flat wall in a standing wave excitation in an ideal fluid
Wang, J. T.; Dual, Jürg (2012)
Ultrasonics
Towards the automation of micron-sized particle handling by use of acoustic manipulation assisted by microfluidics
Oberti, Stefano; Neild, Adrian; Möller, Dirk; et al. (2008)
Ultrasonics

Publications 1 - 10 of 34

Journal: Ultrasonics

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