Transcutaneous measurement and spectrum analysis of heart wall vibrations

Kanai, Hiroshi; Suzuki, Motoyuki; Koiwa, Yoshiro; Chubachi, Noriyoshi

doi:10.1109/58.535480

Cited by 277 publications

(234 citation statements)

References 28 publications

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“…., N m ) as being between two contiguous points, n and nϩ1, along each beam. For measurement of change in thickness of each of the N m layers, the instantaneous depth x m,n (t) of the nth point along the mth beam was simultaneously tracked by applying the phased tracking method 12,13 to the received ultrasound. The minute decrease of several tenths of a micrometer in wall thickness of the nth layer resulting from the arrival of the pressure wave at the beginning of the ejection period was determined by ⌬h m,n (t)ϭx m,nϩ1 (t)Ϫx m,n (t)Ϫh 0 .…”

Section: Measurement Of Change In Thickness Of the Arterial Wallmentioning

confidence: 99%

Elasticity Imaging of Atheroma With Transcutaneous Ultrasound

et al. 2003

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Background-Knowledge of the physical properties of atherosclerotic plaque is essential when evaluating its vulnerability in a clinical setting. Such knowledge, however, is still difficult to obtain with the various approaches developed to date. Methods and Results-This article describes a noninvasive method for evaluating the regional elasticity (the elastic modulus in the circumferential direction) of tissue surrounding atherosclerotic plaque in which a novel phased tracking method is applied to measure minute changes in thickness of each of the multiple layers of the arterial wall during one heartbeat. By comparing the pathological findings with the distribution of elasticity, average elasticity of lipid and that of a mixture of smooth muscle and collagen fiber can be determined. On the basis of these reference parameters, each point is statistically categorized as lipid, mixture, or other. Thus, the plaque is electronically stained using transcutaneous ultrasound. By applying the method to the common carotid arteries, the presence of thin collagen fiber was clarified along the arterial axis for normal subjects, whereas soft inclusion of lipid was found for every plaque in subjects with hyperlipidemia. Conclusion-This

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Section: Measurement Of Change In Thickness Of the Arterial Wallmentioning

confidence: 99%

Elasticity Imaging of Atheroma With Transcutaneous Ultrasound

et al. 2003

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“…Although mean values follow the theoretical strain profile, the standard deviations of strains estimated by the conventional method [1] are large. In Fig.…”

Section: Basic Experimental Resultsmentioning

confidence: 99%

“…Figure 3(a) shows the strain distribution along the ultrasonic beam (the radial direction of the phantom) estimated by the conventional autocorrelation method [1]. Plots and vertical bars show means and standard deviations of 46 individual ultrasonic beams.…”

Section: Basic Experimental Resultsmentioning

confidence: 99%

“…In Fig. 3(b), the center frequency estimation proposed in [2] was used together with the conventional method [1]. However, the strain estimates are not improved so much.…”

Section: Basic Experimental Resultsmentioning

confidence: 99%

“…INTRODUCTION We have developed a phase-sensitive correlation method, namely, phased-tracking method, for estimating the displacement distribution in the arterial wall for strain imaging [1]. In such methods, ultrasonic pulses with finite frequency bandwidths are used.…”

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confidence: 99%

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Strain Imaging of Arterial Wall with Reduction of Effects of Variation in Center Frequency of Ultrasonic RF Echo

Hasegawa

Kanai

2009

IFMBE Proceedings

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Abstract-Atherosclerotic change of the arterial wall leads to a significant change in its elasticity. For assessment of elasticity, measurement of arterial wall deformation is required. For motion estimation, correlation techniques are widely used, and we developed a phase-sensitive correlation method, namely, the phased-tracking method, to measure the regional strain of the arterial wall due to the heartbeat. Although phasesensitive methods using demodulated complex signals require less computation in comparison with methods using the correlation between RF signals or iterative methods, the displacement estimated by such phase-sensitive methods are biased when the center frequency of the RF echo apparently varies. One of the reasons for the apparent change in the center frequency would be the interference of echoes from scatterers within the wall. In the present study, a method was introduced to reduce the influence of variation in the center frequencies of RF echoes on the estimation of the artery-wall strain when using the phase-sensitive correlation technique. The improvement in the strain estimation by the proposed method was validated using a phantom. The error from the theoretical strain profile and the standard deviation in strain estimated by the proposed method were 12.0% and 14.1%, respectively, significantly smaller than those (23.7% and 46.2%) obtained by the conventional phase-sensitive correlation method. Furthermore, in the preliminary in vitro experimental results, the strain distribution of the arterial wall well corresponded with pathology, i.e., the region with calcified tissue showed very small strain, and the region almost homogeneously composed of smooth muscle and collagen showed relatively larger strain and clear strain decay with respect to the radial distance from the lumen.

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Shear Wave Propagation and Probing Tissue Mechanical Properties

CATHELINE,

GIAMMARINARO

2024

Innovative Ultrasound Imaging Techniques

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Transcutaneous measurement and spectrum analysis of heart wall vibrations

Cited by 277 publications

References 28 publications

Elasticity Imaging of Atheroma With Transcutaneous Ultrasound

Elasticity Imaging of Atheroma With Transcutaneous Ultrasound

Strain Imaging of Arterial Wall with Reduction of Effects of Variation in Center Frequency of Ultrasonic RF Echo

Shear Wave Propagation and Probing Tissue Mechanical Properties

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