Onset of pulsatile waves in the heart walls at end-systole

Kanai, Hiroshi; Yonechi, Sachiko; Susukida, Ikuko; Koiwa, Yoshiro; Kamada, Hide Ichi; Tanaka, Motonao

doi:10.1016/s0041-624x(99)00117-1

Cited by 20 publications

(14 citation statements)

References 5 publications

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“…By applying this novel method to healthy human subjects, we have previously found that some impulsive vibrations, which correspond to the second heart sound, are mechanically caused by closure of the heart valves (Kanai et al 2000) and propagate along the heart wall with frequency dispersion (Kanai 2005). Their characteristics were found to agree with the theoretical characteristics of the Lamb wave, a kind of the shear plate wave.…”

Section: Introductionmentioning

confidence: 66%

“…To simultaneously measure the vibrations at many points in the interventricular septum (IVS), ultrasonic diagnostic equipment (SSD6500; Aloka Co. Ltd., Tokyo, Japan) was modified so that N scan lines with different directions from a sector scanner could be arbitrarily selected in real time (Kanai 2005;Kanai et al 2000). The number, N, of directions should be increased as much as possible so as to increase the spatial resolution.…”

Section: Methodsmentioning

confidence: 99%

“…1b for imaging of 2D spatial distribution {u j,k (t; f 1 )} (j 5 1,2,.) (Kanai 2005;Kanai et al 2000). An example of this is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

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Propagation of Vibration Caused by Electrical Excitation in the Normal Human Heart

Kanai

2009

Ultrasound in Medicine & Biology

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Section: Introductionmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

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Propagation of Vibration Caused by Electrical Excitation in the Normal Human Heart

Kanai

2009

Ultrasound in Medicine & Biology

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“…Kanai et al [19], [20] used a sparse sector-scan format, in which the number of ultrasound beams was decreased to about 16 to achieve the peak frame rate of 450 Hz. The onset of "pulsive waves" in the heart wall at end-systole and the propagation of spontaneous vibrations was estimated using a phased-tracking method in human subjects [6], [19], [21], [22].…”

mentioning

confidence: 99%

A composite high-frame-rate system for clinical cardiovascular imaging

Wang

Lee

Provost

et al. 2008

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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High frame-rate ultrasound RF data acquisition has been proved to be critical for novel cardiovascular imaging techniques, such as high-precision myocardial elastography, pulse wave imaging (PWI), and electromechanical wave imaging (EWI). To overcome the frame-rate limitations on standard clinical ultrasound systems, we developed an automated method for multi-sector ultrasound imaging through retrospective electrocardiogram (ECG) gating on a clinically used open architecture system. The method achieved both high spatial (64 beam density) and high temporal resolution (frame rate of 481 Hz) at an imaging depth up to 11 cm and a 100% field of view in a single breath-hold duration. Full-view imaging of the left ventricle and the abdominal aorta of healthy human subjects was performed using the proposed technique in vivo. ECG and ultrasound RF signals were simultaneously acquired on a personal computer (PC). Composite, full-view frames both in RF- and B-mode were reconstructed through retrospective combination of seven small (20%) juxtaposed sectors using an ECG-gating technique. The axial displacement of the left ventricle, in both long-axis and short-axis views, and that of the abdominal aorta, in a long-axis view, were estimated using a RF-based speckle tracking technique. The electromechanical wave and the pulse wave propagation were imaged in a ciné-loop using the proposed imaging technique. Abnormal patterns of such wave propagation can serve as indicators of early cardiovascular disease. This clinical system could thus expand the range of applications in cardiovascular elasticity imaging for quantitative, noninvasive diagnosis of myocardial ischemia or infarction, arrhythmia, abdominal aortic aneurysms, and early-stage atherosclerosis.

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“…At end-systole, a slow upward pulse continued for about 30 ms before the aorticvalve (AV) closure timing T 0 . A steep downward impulse then occurred at T 0 for the beginning of the isovolumic relaxation (IR) period [26].…”

Section: A Distribution Of the Vibrations In And On The Heart Wallmentioning

confidence: 99%

Viscoelasticity measurement of heart wall in in vivo

Kanai

IEEE Ultrasonics Symposium, 2004

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Abstract-By measuring spatial distribution of the minute vibrations in the heart wall from the chest wall using ultrasound, we find that some impulses propagate along the heart wall in healthy human subjects just after closure of the aortic valve for the first time. Their amplitude is found to be on the order of several tens of micrometers, and up to 100 Hz. Their propagation speed shows frequency dispersion, which agrees with the theoretical characteristics of the Lamb wave. The instantaneous viscoelasticity of the wall is then noninvasively determined. These findings have a novel potential for myocardial tissue characterization in clinical diagnosis.

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Onset of pulsatile waves in the heart walls at end-systole

Cited by 20 publications

References 5 publications

Propagation of Vibration Caused by Electrical Excitation in the Normal Human Heart

Propagation of Vibration Caused by Electrical Excitation in the Normal Human Heart

A composite high-frame-rate system for clinical cardiovascular imaging

Viscoelasticity measurement of heart wall in in vivo

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