Multiple-frequency ultrasonic imaging by transmitting pulsed waves of two frequencies

Yoshizumi, Natsuki; Saito, Shigemi; Koyama, Daisuke; Nakamura, Kentaro; Ohya, Akihisa; Akiyama, Iwaki

doi:10.1007/s10396-009-0213-7

Cited by 16 publications

(10 citation statements)

References 12 publications

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“…One is that it has been performed using a single frequency or a limited number of frequencies. 15 The rich information on surface profiles, structures hidden under surfaces, and material properties of objects may exhibit frequency dependence; hence, a single frequency or a limited number of frequencies are not sufficient to describe or explain the characteristics of objects clearly. The concept of multispectral acoustic imaging (MSAI), 16,17 which is an analogue to multispectral imaging in optics and utilizes a wide frequency band with a fine frequency step, has been introduced to investigate the properties of objects.…”

Section: Introductionmentioning

confidence: 99%

Frequency Representation: Visualization and Clustering of Acoustic Data Using Self-Organizing Maps

Guo

Sun

et al. 2017

Ultrason Imaging

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Extraction and display of frequency information in three-dimensional (3D) acoustic data are important steps to analyze object characteristics, because the characteristics, such as profiles, sizes, surface structures, and material properties, may show frequency dependence. In this study, frequency representation (FR) based on phase information in multispectral acoustic imaging (MSAI) is proposed to overcome the limit of intensity or amplitude information in image display. Experiments are performed on 3D acoustic data collected from a rigid surface engraved with five different letters. The results show that the proposed FR technique can not only identify the depth of the five letters by the colors representing frequency characteristics but also demonstrate the 3D image of the five letters, providing more detailed characteristics that are unavailable by conventional acoustic imaging.

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Section: Introductionmentioning

confidence: 99%

Frequency Representation: Visualization and Clustering of Acoustic Data Using Self-Organizing Maps

Guo

Sun

et al. 2017

Ultrason Imaging

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“…On the other hand, use of the optical multi-spectral camera [13,14], which utilizes spectral information to obtain the detailed characteristics of the objects, has spread recently in research studies on remote sensing and medical tissue diagnostics. As an analogy to multispectral imaging in optics, a few studies on the improvement of the quality of images in acoustics with a limited number of frequencies have been reported [15,16]. For example, for medical purposes, interference noise (speckle) is eliminated by taking average over several images recorded at different frequencies.…”

Section: Introductionmentioning

confidence: 99%

RGB representation of two-dimensional multi-spectral acoustic data for object surface profile imaging

Guo¹,

Wada²,

Mizuno³

et al. 2013

Meas. Sci. Technol.

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Conventionally, acoustic imaging has been performed using a single frequency or a limited number of frequencies. However, the rich information on surface profiles, structures hidden under surfaces and material properties of objects may exhibit frequency dependence. In this study, acoustic imaging on object surface was conducted over a wide frequency range with a fine frequency step, and a method for displaying the acquired multi-spectral acoustic data was proposed. A complicated rigid surface with different profiles was illuminated by sound waves sweeping over the frequency range from 1 to 20 kHz with a 30 Hz step. The reflected sound was two-dimensionally recorded using a scanning microphone, and processed using a holographic reconstruction method. The two-dimensional distributions of obtained sound pressure at each frequency were defined as 'multi-spectral acoustic imaging data'. Next, the multi-spectral acoustic data were transformed into a single RGB-based picture for easy understanding of the surface characteristics. The acoustic frequencies were allocated to red, green and blue using the RGB filter technique. The depths of the grooves were identified by their colours in the RGB image.

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“…For medical imaging applications, the ultrasonic transducers are operated in the thickness mode of the piezoelectric element. [1][2][3][4][5][6][7][8] In our work, the Electronic mail:dzk@psu.edu 0003-6951/2016/108(23)/232901/4/$30.00…”

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confidence: 99%

“…[1][2][3][4] Among these applications, the most important one is for medical ultrasound imaging transducers, which produced greatly improved ultrasonic images. 1,2,[5][6][7][8] However, one key issue limits the device performance: the coercive field of PMN-PT single crystals is rather small ($2.5 kV/cm) compared to the traditional Pb(Zr,Ti)O 3 (PZT) ceramics, which limits the maximum operating voltage of the device to produce a strong enough signal for deep penetration imaging. It is generally believed that the degradation of ferroelectric properties is closely related with the ferroelectric domain reorientations that occur near the coercive field.…”

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confidence: 99%

“…For example, for abdominal, obstetric, and cardiac imaging applications, the frequency range is usually from 1 MHz to 5 MHz. [1][2][3][4][5][6][7][8] Therefore, it is necessary to investigate the polarization switching behavior of these single crystals in the megahertz frequency range. The situation is very different from ferroelectric random memory application of ferroelectric thin films, in which complete reversal of polarization is needed and there is only 180 polarization reversal involved.…”

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Switching 70Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 single crystal by 3 MHz bipolar field

Chen

Cao

2016

Applied Physics Letters

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Polarization switching and associated electromechanical property changes at 3.0 MHz were investigated with and without a direct current (dc) bias for [001] poled 0.70Pb(MgNb)O-0.30PbTiO single crystal. The results showed that the coercive field under a bipolar pulse at 3.0 MHz is 2.75 times as large as conventional defined (2.58 kV/cm at 0.1 Hz), and a dc bias can further enlarge the driving field. Our results point to an innovative transducer operating mechanism at high frequencies since one could drive the crystal under much larger fields at high frequencies to produce much stronger signals from a small array element for deeper penetration imaging.

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Multiple-frequency ultrasonic imaging by transmitting pulsed waves of two frequencies

Abstract: A multiple-frequency sound beam was realized by radiating a two-frequency sound. The effectiveness of the presented method was demonstrated through actual imaging.

Cited by 16 publications

References 12 publications

Frequency Representation: Visualization and Clustering of Acoustic Data Using Self-Organizing Maps

Frequency Representation: Visualization and Clustering of Acoustic Data Using Self-Organizing Maps

RGB representation of two-dimensional multi-spectral acoustic data for object surface profile imaging

Switching 70Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 single crystal by 3 MHz bipolar field

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