Chirp coded ultrasonic pulses used for scanning acoustic microscopy

Habib, Anowarul; Melandsø, Frank

doi:10.1109/ultsym.2017.8092627

Cited by 2 publications

(3 citation statements)

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“…The averaged backscattered signals were digitized into time series containing 2048 samples for each pixel in a xy-scan matrix and saved to an HDF5 file format, for further processing in MATLAB. This processing includes, for example, wave compression of the coded waveforms, which was done using a Wiener filter in the Fourier domain, as previously described in our paper [17,32]. After wave compression, the time series were finally processed into C-scan and B-scan images.…”

Section: Resultsmentioning

confidence: 99%

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High-Frequency Acoustic Imaging Using Adhesive-Free Polymer Transducer

et al. 2021

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The piezoelectric polymer PVDF and its copolymers have a long history as transducer materials for medical and biological applications. An efficient use of these polymers can potentially both lower the production cost and offer an environment-friendly alternative for medical transducers which today is dominated by piezoelectric ceramics containing lead. The main goal of the current work has been to compare the image quality of a low-cost in-house transducers made from the copolymer P(VDF-TrFE) to a commercial PVDF transducer. Several test objects were explored with the transducers used in a scanning acoustic microscope, including a human articular cartilage sample, a coin surface, and an etched metal film with fine line structures. To evaluate the image quality, C- and B-scan images were obtained from the recorded time series, and compared in terms of resolution, SNR, point-spread function, and depth imaging capability. The investigation is believed to provide useful information about both the strengths and limitations of low-cost polymer transducers.

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Section: Resultsmentioning

confidence: 99%

“…The symptoms include pain, stiffness of the joint, and weakness in muscles. Several morphological and structural modifications occur during the development of OA [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Acoustic Imaging Using Adhesive-Free Polymer Transducer

et al. 2021

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“…18 For high-frequency SAM devices, coded signals have been tested with fixed codes. 14 At lower frequencies, chirp excitation has been used, 19,20 and there are studies on the imaging fidelity of acoustic microscopes. 4 The current state-of-the-art of commercial and custom-built SAM devices is described in Refs.…”

Section: Article Scitationorg/journal/rsimentioning

confidence: 99%