Ultrasound Detection Using Acoustic Apertures

Hahamovich, Evgeny; Rosenthal, Amir

doi:10.1109/tuffc.2017.2773570

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…Thus, smaller apertures may be used to improve the lateral resolution, leading to a more isotropic reconstruction, as experimentally demonstrated in ref. 37 . Nonetheless, the reconstructions obtained in this work are considerably more isotropic than those conventionally obtained with piezoelectric-based OAT systems, in which the resolution difference between the axes may be more than an order of magnitude 45 .…”

Section: Discussionmentioning

confidence: 99%

“…Second, they increase the angular acceptance of the detector, thus facilitating more isotropic image reconstructions 1 . The increase in angular acceptance is a result of acoustic diffraction, which leads to semi-isotropic angular sensitivities for wavelength-sized apertures 37 . To generate the virtual detector array, the coded mask is scanned in front of the detector, where for each position of the mask, the acoustic waveform is multiplied by a different binary pattern and spatially integrated by the single detector, recording an acoustic signal for each mask position.…”

Section: Introductionmentioning

confidence: 99%

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Single-detector 3D optoacoustic tomography via coded spatial acoustic modulation

et al. 2022

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Optoacoustic tomography (OAT) is a hybrid imaging modality that combines optical excitation with ultrasound detection and enables high-resolution visualization of optical contrasts at tissue depths in which light is completely diffused. Despite its promise in numerous research and clinical applications, OAT is limited by the technological immaturity of ultrasound detection systems. It suffers from limited element count, narrow field of view and lack of technology for spatial modulation of acoustic signals. Here we report single-detector OAT capable of high-fidelity imaging using an amplitude mask in planar geometry coded with cyclic patterns for structured spatial acoustic modulation. Our image reconstruction method maximises sensitivity, is compatible with planar signal detection, and uses only linear operations, thus avoiding artefacts associated with the nonlinear compressed-sensing inversion. We demonstrate our method for 3D OAT of complex objects and living tissue performed with only a single ultrasound detector, effectively coded into a 2D array with 1763 elements. Our method paves the way for a new generation of high-fidelity, low-cost OAT systems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-detector 3D optoacoustic tomography via coded spatial acoustic modulation

et al. 2022

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“…Our rapid modulation scheme and algorithms may be regarded as a new paradigm for SPI, which is not limited by the speed of DMDs, and may enable new applications in fields in which camera technology is limited. In contrast to schemes based on multi-pixel sources 24 , our approach is generic and may be generally used with any optical source or generalized to other wave-based imaging fields by producing appropriate masks for those applications, e.g., thin acoustic blockers in the case of ultrasound 30 or printed circuit boards for terahertz imaging 31 . Alternatively, our scheme may be generalized to other fields by using elements that convert from optics to the field of interest.…”

Section: Discussionmentioning

confidence: 99%

Single pixel imaging at megahertz switching rates via cyclic Hadamard masks

et al. 2021

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Optical imaging is commonly performed with either a camera and wide-field illumination or with a single detector and a scanning collimated beam; unfortunately, these options do not exist at all wavelengths. Single-pixel imaging offers an alternative that can be performed with a single detector and wide-field illumination, potentially enabling imaging applications in which the detection and illumination technologies are immature. However, single-pixel imaging currently suffers from low imaging rates owing to its reliance on configurable spatial light modulators, generally limited to 22 kHz rates. We develop an approach for rapid single-pixel imaging which relies on cyclic patterns coded onto a spinning mask and demonstrate it for in vivo imaging of C. elegans worms. Spatial modulation rates of up to 2.4 MHz, imaging rates of up to 72 fps, and image-reconstruction times of down to 1.5 ms are reported, enabling real-time visualization of dynamic objects.

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“…In contrast to schemes based on multi-pixel sources 24 , our approach is generic and may be generally used with any optical source or generalized to other wave-based imaging fields by producing appropriate masks for those applications, e.g. thin acoustic blockers in the case of ultrasound 30 or printed circuit boards for terahertz imaging 31 . Alternatively, our scheme may be generalized to other fields by using elements that convert from optics to the field of interest.…”

Section: A New Spin On Single-pixel Imaging: Spatial Light Modulation At Megahertz Switch Rates Via Cyclic Hadamard Masksmentioning

confidence: 99%

A new spin on single-pixel imaging: spatial light modulation at megahertz switch rates via cyclic Hadamard masks

Rosenthal

Hahamovich

Monin

et al. 2021

Preprint

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Optical imaging is commonly performed with either a camera and wide-field illumination or with a single detector and a collimated beam that scans the imaged object. Unfortunately, sources that can be collimated and cameras do not exist at all wavelengths and may not always achieve the specifications required for a given application. Single-pixel imaging (SPI) offers an alternative that requires a single detector and may be performed with wide-field illumination, potentially enabling imaging applications in which both the detection and illumination technologies are immature. However, SPI currently struggles with low imaging rates owing to its reliance on configurable spatial light modulators, whose rates do not generally exceed 22 kHz. In this work, we develop an approach towards rapid SPI which relies on cyclic patterns coded onto a spinning mask and demonstrate it for in vivo imaging of C. elegans worms. Spatial modulation rates of up to 2.4 MHz and imaging rates of up to 72 fps are reported, creating new opportunities for using the SPI paradigm in dynamic imaging scenarios.

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Ultrasound Detection Using Acoustic Apertures

Cited by 7 publications

References 38 publications

Single-detector 3D optoacoustic tomography via coded spatial acoustic modulation

Single-detector 3D optoacoustic tomography via coded spatial acoustic modulation

Single pixel imaging at megahertz switching rates via cyclic Hadamard masks

A new spin on single-pixel imaging: spatial light modulation at megahertz switch rates via cyclic Hadamard masks

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