Search Results - "TANAKA, MOTONAO"

A New Echocardiographic Method for Identifying Vortex Flow in the Left Ventricle: Numerical Validation by Uejima, Tokuhisa, Koike, Akira, Sawada, Hitoshi, Aizawa, Tadanori, Ohtsuki, Shigeo, Tanaka, Motonao, Furukawa, Tetsushi, Fraser, Alan G

“…Abstract A new mathematical method for estimating velocity vectors from color Doppler datasets is proposed to image blood flow dynamics; this method has been…”
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Minute Mechanical-Excitation Wave-Front Propagation in Human Myocardial Tissue by Kanai, Hiroshi, Tanaka, Motonao

“…Complexity of the cardiac contraction sequence is still not fully understood because the dynamic mechanical excitation process, which directly correlates with…”
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Blood flow structure and dynamics, and ejection mechanism in the left ventricle: Analysis using echo-dynamography by Tanaka, Motonao, MD, FJCC, Sakamoto, Tsuguya, MD, FJCC, Sugawara, Shigeo, MD, Nakajima, Hiroyuki, RMS, Katahira, Yoshiaki, MD, Ohtsuki, Shigeo, PhD, Kanai, Hiroshi, PhD

“…Summary Using our “echo-dynamography”, blood flow structure and flow dynamics during ventricular systole were investigated in 10 normal volunteers. The…”
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Role of intra-ventricular vortex in left ventricular ejection elucidated by echo-dynamography by Tanaka, Motonao, Sakamoto, Tsuguya, Saijo, Yoshifumi, Katahira, Yoshiaki, Sugawara, Shigeo, Nakajima, Hiroyuki, Kurokawa, Takafumi, Kanai, Hiroshi

“…Purpose From the correlation between the blood flow dynamics and wall dynamics in the left ventriocle (LV) analyzed using echo-dynamography, the ejection…”
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Deformability of the pulsating left ventricular wall: A new aspect elucidated by high resolution ultrasonic methods by Tanaka, Motonao, MD, PhD, FJCC, Sakamoto, Tsuguya, MD, PhD, FJCC, Sugawara, Shigeo, MD, PhD, FJCC, Katahira, Yoshiaki, MD, PhD, FJCC, Hasegawa, Kaoru, MD, Nakajima, Hiroyuki, RMS, Kurokawa, Takafumi, RMS, Kanai, Hiroshi, PhD, Hasegawa, Hideyuki, PhD

“…Abstract Background Although the deformability of the left ventricular (LV) wall appears to be important in maintaining effective cardiac performance, this has…”
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A new concept of the contraction–extension property of the left ventricular myocardium by Tanaka, Motonao, MD, PhD, FJCC, Sakamoto, Tsuguya, MD, PhD, FJCC, Sugawara, Shigeo, MD, PhD, FJCC, Katahira, Yoshiaki, MD, PhD, FJCC, Tabuchi, Haruna, MD, Nakajima, Hiroyuki, RMS, Kurokawa, Takafumi, RMS, Kanai, Hiroshi, PhD, Hasegawa, Hideyuki, PhD, Ohtsuki, Shigeo, PhD

“…Abstract Objectives Using newly developed ultrasonic technology, we attempted to disclose the characteristics of the left ventricular (LV)…”
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Spiral systolic blood flow in the ascending aorta and aortic arch analyzed by echo-dynamography by Tanaka, Motonao, MD, FJCC, Sakamoto, Tsuguya, MD, FJCC, Sugawara, Shigeo, MD, FJCC, Nakajima, Hiroyuki, RMS, Kameyama, Takeyoshi, MD, Katahira, Yoshiaki, MD, Ohtsuki, Shigeo, PhD, Kanai, Hiroshi, PhD

“…Summary Using echo-dynamography, systolic blood flow structure in the ascending aorta and aortic arch was investigated in 10 healthy volunteers. The blood flow…”
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Physiological basis and clinical significance of left ventricular suction studied using echo-dynamography by Tanaka, Motonao, MD, FJCC, Sakamoto, Tsuguya, MD, FJCC, Sugawara, Shigeo, MD, FJCC, Nakajima, Hiroyuki, RMS, Kameyama, Takeyoshi, MD, Tabuchi, Haruna, MD, Katahira, Yoshiaki, MD, Ohtsuki, Shigeo, PhD, Kanai, Hiroshi, PhD

“…Summary Background The existence as well as the exact genesis of left ventricular suction during rapid filling phase have been controversial. In the present…”
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Non-uniform distribution of the contraction/extension (C–E) in the left ventricular myocardium related to the myocardial function by Tanaka, Motonao, MD, PhD, FJCC, Sakamoto, Tsuguya, MD, PhD, FJCC, Katahira, Yoshiaki, MD, PhD, FJCC, Tabuchi, Haruna, MD, Nakajima, Hiroyuki, RMS, Kurokawa, Takafumi, RMS, Kanai, Hiroshi, PhD, Hasegawa, Hideyuki, PhD, Ohtsuki, Shigeo, PhD

“…Abstract Objective We attempted to disclose the microscopic characteristics of the non-uniform distribution of the contraction and extension (C–E) of the left…”
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Ultrasonic Tissue Characterization of Atherosclerosis by a Speed-of-Sound Microscanning System by Saijo, Y., Filho, E.S., Sasaki, H., Yambe, T., Tanaka, M., Hozumi, N., Kobayashi, K., Okada, N.

“…We have been developing a scanning acoustic microscope (SAM) system for medicine and biology featuring quantitative measurement of ultrasonic parameters of…”
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Minute Mechanical-Excitation Wave-Front Propagation in Human Myocardial Tissue by Kanai, Hiroshi, Tanaka, Motonao

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Location of flow axis line in the left ventricle and its interaction with local myocardial motion by Nakajima, Hiroyuki, Sugawara, Shigeo, Kameyama, Takeyoshi, Tabuchi, Haruna, Ohtsuki, Shigeo, Tanaka, Motonao, Saijo, Yoshifumi

“…Background The interaction between local myocardial motion and blood flow dynamics should be assessed to evaluate left ventricular pump function. Methods The…”
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Ultrasonic tissue characterization of infarcted myocardium by scanning acoustic microscopy by Saijo, Y, Tanaka, M, Okawai, H, Sasaki, H, Nitta, S I, Dunn, F

“…The purpose of this study was to ultrasonically characterize infarcted human myocardial tissue at the microscopic level by scanning acoustic microscopy…”
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Influence of tissue preparation on the acoustic properties of tissue sections at high frequencies by Sasaki, Hidehiko, Saijo, Yoshifumi, Tanaka, Motonao, Nitta, Shin-ichi

“…The purpose of the present study was to clarify the influence of tissue preparation on the high-frequency acoustic properties by comparing the acoustic…”
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Relationship Between Speed of Sound in and Density of Normal and Diseased Rat Livers by Hiroyuki Hachiya, Hiroyuki Hachiya, Shigeo Ohtsuki, Shigeo Ohtsuki, Motonao Tanaka, Motonao Tanaka

“…Speed of sound is an important acoustic parameter for quantitative characterization of living tissues. In this paper, the relationship between speed of sound…”
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Visualization of human umbilical vein endothelial cells by acoustic microscopy by Saijo, Yoshifumi, Sasaki, Hidehiko, Sato, Masaaki, Nitta, Shin-ichi, Tanaka, Motonao

“…The morphology and acoustic properties of the human umbilical vein endothelial cells (HUVECs) were evaluated using a scanning acoustic microscope system…”
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Sound speed scanning acoustic microscopy for biomedical applications by Saijo, Yoshifumi, Sasaki, Hidehiko, Hozumi, Naohiro, Kobayashi, Kazuto, Tanaka, Motonao, Yambe, Tomoyuki

“…Since 1985, we have been developing a scanning acoustic microscope (SAM) system for biomedical use and have been investigating the acoustic properties of…”
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Measurement of Rapid Variation in Ultrasound Backscattering During Change in Thickness of Tissue Phantom by Kanai, Hiroshi, Koiwa, Yoshiro, Katsumata, Shin'ichi, Izumi, Naoyuki, Tanaka, Motonao

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Simultaneous measurement of vibrations on arterial wall upstream and downstream of arteriostenosis lesion and their analysis by Sunagawa, Kazuhiro, Kanai, Hiroshi, Koiwa, Yoshiro, Nitta, Keiko, Tanaka, Motonao

“…Acute myocardial infarction and cerebral infarction are generally known to be caused primarily by the rupture of atherosclerotic plaques. It is thus necessary…”
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Determination of sound speed in biological tissues based on frequency analysis of pulse response by HACHIYA, H, OHTSUKI, S, TANAKA, M, DUNN, F

“…The sound speed in biological tissues provides important diagnostic and treatment planning information. Conventional methods of sound-speed determination…”
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