The Benefits of Compression Methods in Acoustic Coherence Tomography

Rouyer, Julien; Mensah, Serge; Vasseur, Clement; Lasaygues, Philippe

doi:10.1177/0161734614553310

Cited by 11 publications

(8 citation statements)

References 35 publications

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“…When a recognizable signature is sent through the media, such as chirp signal, input and output signals delay time can be obtained using cross-correlation [26,27,28]. The maximum value for the crosscorrelation function between two signals indicates their delay time.…”

Section: Cross-correlationmentioning

confidence: 99%

“…Automatic methods for detecting first arrivals have been proposed, including pickers based on the Akaike information criteria (AIC) [23,24] and the Hinkley criteria [25]. Alternatives include the transmission of encoded waveforms, such as the chirp-coded excitation method, where a recognizable signature is sent through the media and the TOF is estimated using a cross-correlation function [26,27,28]. In consideration of the wide range of signals and TOF detection techniques, the choice of pa-…”

mentioning

confidence: 99%

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Accuracy on the Time-of-Flight Estimation for Ultrasonic Waves Applied to Non-Destructive Evaluation of Standing Trees: A Comparative Experimental Study

Espinosa¹,

Bacca²,

Prieto³

et al. 2018

Acta Acustica united with Acustica

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Time-of-flight measurement is a critical step to per-2 form ultrasonic non-destructive testing of standing 3 trees, with direct influence on the precision of de-4 fect detection. Aiming to increase the accuracy on 5 the estimation, the characteristics of the ultrasonic 6 measurement chain should be adapted to the con-7 straints of wood testing in living condition. This 8 study focused on the excitation signal parameters, 9 such as shape, temporal duration, and frequency re-10 sponse, and then the selection of a suitable time-11 of-flight determination technique. A standing plane 12 tree was tested, placing ultrasonic receivers at four 13 different positions, with five different excitation sig-14 nals and three time-of-flight detection methods. The 15 proposed ultrasonic chain of measurement resulted in 16 high signal-to-noise ratios in received signals for all 17 configurations. A time-frequency analysis was used 18 to determine the power distribution in the frequency 19 domain, showing that only chirp signal could concen-20 trate the power around the resonant frequency of the 21 sensor. Threshold and Akaike information criterion 22 method performed similar for impulsive signals with 23 decreasing uncertainty as sensor position approached 24 to the radial direction. Those two methods failed to 25 accurate determine time-of-flight for Gaussian pulse 26 and chirp signals. Cross-correlation was only suitable 27 for the chirp signal, presenting the lower uncertainty 28 values among all configurations.

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Section: Cross-correlationmentioning

confidence: 99%

mentioning

confidence: 99%

Accuracy on the Time-of-Flight Estimation for Ultrasonic Waves Applied to Non-Destructive Evaluation of Standing Trees: A Comparative Experimental Study

Espinosa¹,

Bacca²,

Prieto³

et al. 2018

Acta Acustica united with Acustica

Self Cite

View full text Add to dashboard Cite

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“…But the spatiotemporal resolution of the image is reduced. The "lost" resolution can be enhanced using efficient signal processing methods, such as signal deconvolution [22,23] or pulse compression [24,25]. Our group has developed a procedure for multiscale wavelet decomposition of the signals allowing all available wave packets to be processed in terms of frequency and time [26].…”

Section: Introductionmentioning

confidence: 99%

Reflection-Mode Ultrasound Computed Tomography Based on Wavelet Processing for High-Contrast Anatomical and Morphometric Imaging

et al. 2021

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Medical B-mode ultrasound is widely used for the examination of children’s limbs, including soft tissue, muscle, and bone. However, for the accurate examination of the bone only, it is often replaced by more restrictive clinical modalities. Several authors have investigated ultrasonic imaging of bone to assess cortical thickness and/or to estimate the wave velocity through the internal structure. The present work focuses on the transverse slice imaging process using reflection-mode ultrasound computed tomography (USCT). The method is valid for imaging soft tissues with similar acoustic impedances, but in the presence of bone, the higher contrasts alter the propagation of ultrasonic waves and reduce the contrast-to-noise ratio (CNR). There is a need to change the methods used for the processing of ultrasonic signals. Our group has developed a wavelet-based coded excitation (WCE) method to process information in frequency and time. The objective of this study is to use the method to improve reflection-mode USCT, at low ultrasonic intensities, to better address organ morphometry. Experimental results on a newborn arm phantom and on an ex vivo chicken drumstick are presented, and the usefulness of this WCE-mode USCT is discussed.

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“…Contemporary day communication systems relies on coding techniques for the intent of designing an efficient and reliable transmission system. Pulse compression is one such well-known coding technique being used in variety of applications, including the modern radio communication systems like radar and sonar, where propagation of radio wave or field through non-conducting medium such as air or space is involved [1][2][3][4][5][6]. The present article limits its investigation on the pulse compression application in radar used for profiling the atmosphere [7,8].…”

Section: Introductionmentioning

confidence: 99%

Simulation and interactive approach based demonstration of pulse compression technique in atmospheric radar

2019

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Pulse compression technique plays a vital role in many communication systems e.g. optical, radio frequency (RF)/microwave, and biomedical applications. This article deals with demonstration of the technique in the atmospheric radar employed for wind profiling under various weather conditions. Relevant computation, simulations and analysis involved in practical application or implementation of this technique, that are achieved using the widely accepted complementary codes are presented. Moreover, making use of the computational and visualization features of MATLAB and LabVIEW packages, a flexible front-end graphic-user-interface (GUI) is designed and developed to demonstrate the functionality of this technique in the atmospheric radar operating at 206.5 MHz in the central Himalayan region. The GUI introduces the features of displaying coded or uncoded transmission and reception based on various user defined parameters such as pulse width (PW), pulse repetition frequency (PRF), Doppler frequency, and the number of data points. An interlock arrangement for inter-pulse period (IPP)-duty ratio is added to restrict the radar pulsed operation with the maximum duty ratio up to 15%. An arrangement is also made to visualize the auto and cross-correlations performed on the code sequences and RF signals. The user-friendly and easily customized GUI will benefit the larger user community in saving their time in writing their programs and/or constructing any hardware assemblies to test the performance of pulse compression technique during early design phases.

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The Benefits of Compression Methods in Acoustic Coherence Tomography

Cited by 11 publications

References 35 publications

Accuracy on the Time-of-Flight Estimation for Ultrasonic Waves Applied to Non-Destructive Evaluation of Standing Trees: A Comparative Experimental Study

Accuracy on the Time-of-Flight Estimation for Ultrasonic Waves Applied to Non-Destructive Evaluation of Standing Trees: A Comparative Experimental Study

Reflection-Mode Ultrasound Computed Tomography Based on Wavelet Processing for High-Contrast Anatomical and Morphometric Imaging

Simulation and interactive approach based demonstration of pulse compression technique in atmospheric radar

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