Shear wave mapping of skeletal muscle using shear wave wavefront reconstruction based on ultrasound color flow imaging

Yamakoshi, Yoshiki; Yamamoto, Atsushi; Kasahara, Toshihiro; Iijima, Takafumi; Yuminaka, Yasushi

doi:10.7567/jjap.54.07hc16

Cited by 14 publications

(17 citation statements)

References 31 publications

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“…Powdered agar (g) Sterilized milk (ml) www.nature.com/scientificreports/ showed that shear wave velocity measurements in phantom gels, supraclavicular muscles, and trapezius muscles acquired using the new method were consistent with those acquired by means of other instruments 15,33,34,51,52 .…”

Section: Concentration (%)mentioning

confidence: 70%

“…3), tissues can be readily measured close to the body surface; however, the measurement of deep tissues may be difficult. A previous study 51 showed that stable measurement of deeper tissues may be achieved by modifying the shear wave frequency of the actuator with respect to shear wave tissue absorption. However, the feasibility of this approach must be confirmed through additional investigations.…”

Section: Concentration (%)mentioning

confidence: 99%

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Application of the novel estimation method by shear wave elastography using vibrator to human skeletal muscle

Tsuchida

Yamakoshi

Matsuo

et al. 2020

Sci Rep

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In recent years, non-invasive measurement of tissue stiffness (hardness) using ultrasound elastography has attracted considerable attention. It has been used to evaluate muscle stiffness in the fields of rehabilitation, sports, and orthopedics. However, ultrasonic diagnostic devices with elastography systems are expensive and clinical use of such devices has been limited. In this study, we proposed a novel estimation method for vibration-based shear wave elastography measurement of human skeletal muscle, then determined its reproducibility and reliability. The coefficient of variation and correlation coefficient were used to determine reproducibility and reliability of the method by measuring the shear wave velocities in konjac phantom gels and agar phantom gels, as well as skeletal muscle. The intra-day, day-to-day, and inter-operator reliabilities were good when measuring the shear wave velocities in phantom gels. The intra-day and day-to-day reliabilities were good when measuring the shear wave velocities in skeletal muscle. The findings confirmed adequate reproducibility and reliability of the novel estimation method for vibration-based shear wave elastography. Therefore, the proposed measurement method may be a useful tool for evaluation of muscle stiffness.

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Section: Concentration (%)mentioning

confidence: 70%

Section: Concentration (%)mentioning

confidence: 99%

Application of the novel estimation method by shear wave elastography using vibrator to human skeletal muscle

Tsuchida

Yamakoshi

Matsuo

et al. 2020

Sci Rep

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“…Several methods have been proposed as SWI and they have been applied to various tissues, for example, breast, liver and thyroid gland, in which the hardness of the tissue is sensitive to diseases. We have proposed a novel SWI method (Color Doppler SWI: CD SWI) for continuous shear wave which is excited by a mechanical vibrator [1,2]. In this method, shear wave propagation inside the tissue is appeared directly on the color flow map of conventional ultrasound imaging system without adding any extra function to the imaging system.…”

Section: Introductionmentioning

confidence: 99%

Shear wave transmissivity measurement by color Doppler shear wave imaging

Yamakoshi¹,

Yamazaki²,

Kasahara³

et al. 2016

Jpn. J. Appl. Phys.

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Shear wave elastography is a useful method for evaluating tissue stiffness. We have proposed a novel shear wave imaging method (color Doppler shear wave imaging: CD SWI), which utilizes a signal processing unit in ultrasound color flow imaging in order to detect the shear wave wavefront in real time. Shear wave velocity is adopted to characterize tissue stiffness; however, it is difficult to measure tissue stiffness with high spatial resolution because of the artifact produced by shear wave diffraction. Spatial average processing in the image reconstruction method also degrades the spatial resolution. In this paper, we propose a novel measurement method for the shear wave transmissivity of a tissue boundary. Shear wave wavefront maps are acquired by changing the displacement amplitude of the shear wave and the transmissivity of the shear wave, which gives the difference in shear wave velocity between two mediums separated by the boundary, is measured from the ratio of two threshold voltages required to form the shear wave wavefronts in the two mediums. From this method, a high-resolution shear wave amplitude imaging method that reconstructs a tissue boundary is proposed.

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“…[1][2][3][4] Several methods for SWEI have been proposed, including strain elastography and ultrasound push pulse-based shear wave elastography. [5][6][7][8][9][10][11] Strain elastography has a number of advantages over other elastography methods, including quick and easy image acquisition. However, because quantification using this method is difficult, relative evaluations, such as the Tsukuba-score for thyroid nodules, are generally employed.…”

Section: Introductionmentioning

confidence: 99%

“…CFIs including the shear wave wavefront can contain various artifacts from standing waves or reflected waves at tissue boundaries. To suppress the phase variations on shear wave phase maps, the current Fourier analysis requires at least 32 CFI frames to be captured every 2 to 3 s. 11 The phase amount on the phase map is calculated by applying fast Fourier transform (FFT) to the time axis that is the frame direction for each pixel. However, maintaining real-time CD SWI is clinically important; real-time visualization of shear wave propagation on shear wave phase and velocity maps is required to allow physicians to properly position the vibrator and receiver device for image acquisition.…”

Section: Introductionmentioning

confidence: 99%

A Color-Doppler Shear-Wave-Imaging Phase-reconstruction Method Using Four Color Flow Images

2016

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This study investigates shear wave phase map reconstruction using a limited number of color flow images (CFIs) acquired with a color Doppler ultrasound imaging instrument. We propose an efficient reconstruction method to considerably reduce the number of CFIs required for reconstruction and compare this method with Fourier analysis-based color Doppler shear wave imaging. The proposed method uses a two-step phase reconstruction process, including an initial phase map derived from four CFIs using an advanced iterative algorithm of optical interferometry. The second step reduces phase artifacts in the initial phase map using an iterative correction procedure that cycles between the Fourier and inverse Fourier domains while imposing directional filtering and total variation regularization. We demonstrate the efficacy of this method using synthetic and experimental data of a breast phantom and human breast tissue. Our results show that the proposed method maintains image quality and reduces the number of CFIs required to four; previous methods have required at least 32 CFIs to achieve equivalent image quality. The proposed method is applicable to real-time shear wave elastography using a continuous shear wave produced by a mechanical vibrator.

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Shear wave mapping of skeletal muscle using shear wave wavefront reconstruction based on ultrasound color flow imaging

Cited by 14 publications

References 31 publications

Application of the novel estimation method by shear wave elastography using vibrator to human skeletal muscle

Application of the novel estimation method by shear wave elastography using vibrator to human skeletal muscle

Shear wave transmissivity measurement by color Doppler shear wave imaging

A Color-Doppler Shear-Wave-Imaging Phase-reconstruction Method Using Four Color Flow Images

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