Search Results - "KOIWA, Y"

Transcutaneous measurement and spectrum analysis of heart wall vibrations by Kanai, H., Sato, M., Koiwa, Y., Chubachi, N.

“…For the noninvasive diagnosis of heart disease based on the acoustic and elastic characteristics of the heart muscle, it is necessary to transcutaneously…”
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Noninvasive evaluation of local myocardial thickening and its color-coded imaging by Kanai, H., Hasegawa, H., Chubachi, N., Koiwa, Y., Tanaka, M.

“…For the noninvasive diagnosis of heart disease based on the acoustic characteristics of the heart muscle, we have developed a new method for accurately…”
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Real-time measurements of local myocardium motion and arterial wall thickening by Kanai, H., Koiwa, Y., Jianping Zhang

“…We have already developed a new method, namely, the phased tracking method, to track the movement of the heart wall and arterial wall accurately based on both…”
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Detection of lumen-intima interface of posterior wall for measurement of elasticity of the human carotid artery by Hasegawa, H., Kanai, H., Koiwa, Y.

“…In our series of studies on noninvasive assessment of the regional elasticity of the arterial wall, the displacement gradient (change in thickness) of the…”
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Interfacial instability of a condensing vapor bubble in a subcooled liquid by Ueno, I., Ando, J., Koiwa, Y., Saiki, T., Kaneko, T.

“…A special attention is paid to the condensing and collapsing processes of vapor bubble injected into a subcooled pool. We try to extract the vapor-liquid…”
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The effect of diastolic vibration on the relaxation of rat papillary muscle by Janssen, P.M.L., Honda, H., Koiwa, Y., Shirato, K.

“…Objective: It has been demonstrated that the application of an external mechanical vibration during the ventricular relaxation phase of the heart (diastolic…”
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Elasticity imaging of atheroma with transcutaneous ultrasound: Preliminary study by KANAI, Hiroshi, HASEGAWA, Hideyuki, ICHIKI, Masataka, TEZUKA, Fumiaki, KOIWA, Yoshiro

“…Knowledge of the physical properties of atherosclerotic plaque is essential when evaluating its vulnerability in a clinical setting. Such knowledge, however,…”
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The effect of applied mechanical vibration on two different phases of rat papillary muscle relaxation by Janssen, P M, Schiereck, P, Honda, H, Naya, T, Koiwa, Y

“…Applying external mechanical vibration during the relaxation phase of rat papillary muscle decreases the duration of the first part of the relaxation phase. To…”
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Noninvasive measurement of left ventricular myocardial elasticity by Honda, H, Koiwa, Y, Takagi, K, Kikuchi, J, Hoshi, N, Takishima, T, Butler, J P

“…We examined Advani and Lee's equation (ALeq) and a dimension analysis-derived equation (DAeq), both of which treat vibration of the elastic spherical shell and…”
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A new approach to time dependent AR modeling of signals and its application to analysis of the fourth heart sound by Kanai, H., Chubachi, N., Kido, K., Koiwa, Y., Takagi, T., Kikuchi, J., Takishima, T.

“…The authors present a method for estimating spectrum transition between short-length signals of succeeding frames in low-SNR cases when the transition pattern…”
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Effects of arterial distensibility on left ventricular ejection in the depressed contractile state by Maruyama, Y, Nishioka, O, Nozaki, E, Kinoshita, H, Kyono, H, Koiwa, Y, Takishima, T

“…The aim was to evaluate the effects of arterial distensibility on ventricular ejection in various ventricular contractile states: (1) control; (2) a regionally…”
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Diastolic vibration improves systolic function in cases of incomplete relaxation by TAKAGI, T, KOIWA, Y, KIKUCHI, J.-I, HONDA, H, HOSHI, N, BUTLER, J. P, TAKISHIMA, T

“…Incomplete relaxation of the left ventricle (LV) affects LV filling, but the subsequent effect on LV systolic function remains unclear. We attempted to improve…”
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Effects of mechanical vibration on left ventricular diastolic properties during global ischemia by Kikuchi, J, Koiwa, Y, Takagi, T, Honda, H, Hoshi, N, Butler, J P, Takishima, T

“…To examine the effect of mechanical vibration on ventricular relaxation and diastolic chamber stiffness under global ischemia, we studied eight coronary…”
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Myocardial rapid velocity distribution by Kanai, H, Koiwa, Y

“…Myocardial motion exhibits frequency components of up to 100 Hz, as found by a phased tracking method. To simultaneously measure the rapid and minute velocity…”
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Regional myocardial volume perfused by the coronary artery branch: estimation in vivo by KOIWA, Y, BAHN, R. C, RITMAN, E. L

“…Seven closed-chest dogs were anesthetized with intramuscular Innovar and a N2O/O2 gas mixture. Maximal coronary vasodilation was induced by intra-aortic…”
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Dependence of Instantaneous Transfer Function on Regional Ischemic Myocardial Volume by Hashiguchi, Ryoichi, Koiwa, Yoshiro, Ohyama, Tadasu, Takagi, Takehiko, Kikuchi, Jun-ichi, Butler, James P, Takishima, Tamotsu

“…To obtain the instantaneous left ventricular transfer function curve (instantaneous TFC) under conditions of regional ischemia, sinusoidal accelerations…”
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Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model by TANI, J, YAMAMOTO, H, HONDA, H, OOTOMO, K, KOIWA, Y, TAKAGI, T, KIKUCHI, J, HOSHI, N, TAKISHIMA, T

“…The authors measured the transfer function (TF) of the left ventricle (LV) in an isolated canine preparation. Here TF indicates the ratio of induced vibration…”
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Measurement of instantaneous viscoelastic properties by impedance-frequency curve of the ventricle by Koiwa, Y, Hashiguchi, R, Ohyama, T, Isoyama, S, Satoh, S, Suzuki, H, Takishima, T

“…We developed a method for estimating the instantaneous viscoelastic properties of the left ventricle (LV). This impedance-curve method is based on the…”
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A new approach for the clinical evaluation of the heart sound: an analysis of the heart sound in the estimation of viscoelastic properties of the human left ventricle by Koiwa, Y

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Measurement of propagation speed of pulsive wave in heart wall at end-systole by Kanai, H., Koiwa, Y.

“…We have already developed a novel ultrasonic-based method, namely, the phased tracking method, to measure the rapid velocity in the heart wall by accurately…”
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