Search Results:　 1-20 of 246

1

Observation of anomalous deformation behavior in metastable austenitic stainless steel by infrared thermography [in Japanese]

Ouchi Takahiro , Tominaga Manabu

… Metastable austenitic stainless steel is transformed to martensitic phase from austenitic phase by strain of cold working. … This phenomenon is called strain induced martensitic transformation and brings high ductility, high strength. … In the previous study, this phenomenon was investigated using dynamic electronic speckle pattern interferometry (DESPI). … As a result, infrared thermography could observe behavior of local strain as well as DESPI. …

茨城工業高等専門学校研究彙報 48, 5-11, 2013-03-01

CiNii Fulltext PDF - Open Access
2

THE RESEARCH ON THE COMPRESSED CONCRETE LOCAL DEFORMATION WITH THE WHITE LIGHT SPECKLE TECHNOLOGY

MENG DELIANG , LI HUIJIAN , CHENG PIN

ICIC express letters. Part B, Applications : an international journal of research and surveys 3(6), 1357-1362, 2012-12-00
3

Normal Range of Left Ventricular 2-Dimensional Strain : Japanese Ultrasound Speckle Tracking of the Left Ventricle (JUSTICE) Study

TAKIGIKU Kiyohiro , TAKEUCHI Masaaki , IZUMI Chisato , YUDA Satoshi , SAKATA Konomi , OHTE Nobuyuki , TANABE Kazuaki , NAKATANI Satoshi

Circulation journal : official journal of the Japanese Circulation Society 76(11), 2623-2632, 2012-10-25

References (22)
4

Speckle Interferometry-Digital Image Correlation Hybrid Method for Wide Range Strain Measurement [in Japanese]

有川秀一 , 冨永泰隆 , 米山聡

実験力学 12(3), 235-242, 2012-09-00
5

Optimization of Correlation Kernel Size for Accurate Estimation of Myocardial Contraction and Relaxation

Honjo Yasunori , Hasegawa Hideyuki , Kanai Hiroshi

… For noninvasive and quantitative measurements of global two-dimensional (2D) heart wall motion, speckle tracking methods have been developed and applied. … In these conventional methods, the frame rate is limited to about 200 Hz, corresponding to the sampling period of 5 ms. However, myocardial function during short periods, as obtained by these conventional speckle tracking methods, remains unclear owing to low temporal and spatial resolutions of these methods. …

Jpn J Appl Phys 51(7), 07GF06-07GF06-12, 2012-07-25

The Japan Society of Applied Physics
6

A Practical Approach to Using Strain Echocardiography to Evaluate the Left Ventricle

FEIGENBAUM Harvey , MASTOURI Ronald , SAWADA Stephen

… Speckle tracking strain echocardiography (SE) provides a quantitative regional and global LV assessment, is an independent supplement to wall motion analysis and has been validated over the past 10 years. … SE can generate longitudinal, radial, and circumferential strain measurements and LV twist. … A pragmatic approach to SE simplifies the suggested method for strain calculation to reduce the time required and enhance reproducibility. …

Circulation Journal 76(7), 1550-1555, 2012-06-25

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7

Increase in accuracy of tissue displacement vector measurement and speckle reduction using coherent and incoherent superposition of multidimensional echo signals [in Japanese]

SUMI Chikayoshi , ISHII Yousuke , HIRABAYASHI Yuuto

有効な超音波組織変位計測法を開発することにより、組織変位計測および歪計測の応用を広範化できる(様々な血流計測、心臓や肝の動き等)。我々は、開発した横方向変調(LM)と単一ステアリング角度を用いたステアリング(ASTA)を組織変位ベクトル計測(歪テンソル計測)と組織エコーイメージングに応用してきた。エコーイメージングに関しては、横方向にもキャリア周波数のある高分解能イメージングを行うことができ、組織 …

IEICE technical report. Ultrasonics 112(16), 33-38, 2012-04-18

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8

Impact of Left Ventricular Afterload on Longitudinal Dyssynchrony in Patients With Severe Aortic Stenosis and Preserved Ejection Fraction

YAMAWAKI Kohei , TANAKA Hidekazu , MATSUMOTO Kensuke , HIRAISHI Mana , MIYOSHI Tatsuya , KANEKO Akihiro , TSUJI Takayuki , RYO Keiko , NORISADA Kazuko , FUKUDA Yuko , TATSUMI Kazuhiro , ONISHI Tetsuari , OKADA Kenji , OKITA Yutaka , KAWAI Hiroya , HIRATA Ken-ichi

… Longitudinal dyssynchrony was determined as the standard deviation for time-to-peak speckle-tracking strain in apical 4- and 2-chamber views at the basal- and mid-levels. … Radial and circumferential dyssynchrony was determined as the difference for time-to-peak strain between the anteroseptum and posterior wall from the mid-left ventricular (LV) short-axis view. … Each of the myocardial functions was also evaluated by averaging each peak systolic strain. …

Circulation Journal 76(3), 744-751, 2012-02-25

J-STAGE Ichushi Web CrossRef References (28) Cited by (1)
9

Effect of Left Ventricular Dyssynchrony on Cardiac Sympathetic Activity in Heart Failure Patients With Wide QRS Duration

TANAKA Hidekazu , TATSUMI Kazuhiro , FUJIWARA Sei , TSUJI Takayuki , KANEKO Akihiro , RYO Keiko , FUKUDA Yuko , MATSUMOTO Kensuke , SHIGERU Mayumi , YOSHIDA Akihiro , KAWAI Hiroya , HIRATA Ken-ichi

… Dyssynchrony was determined by the time difference between the anteroseptal-to-posterior wall using speckle-tracking radial strain (≥130ms predefined as significant). …

Circulation Journal 76(2), 382-389, 2012-01-25

J-STAGE Ichushi Web CrossRef References (28) Cited by (1)
10

Impact of Septal Curvature on Regional Strain in Patients With Hypertrophic Cardiomyopathy

Inoue Katsuji , Okayama Hideki , Nishimura Kazuhisa , Nagai Takayuki , Suzuki Jun , Ogimoto Akiyoshi , Saito Makoto , Yoshii Toyofumi , Hiasa Go , Sumimoto Takumi , Funada Jun-ichi , Shigematsu Yuji , Hamada Mareomi , Higaki Jitsuo

… The aim of this study was to examine the relationship between curvature of the LV wall and regional myocardial strain. … Peak systolic strain was calculated in the septal and lateral walls using 2-D speckle tracking echocardiography. … The septal curvature index and septal longitudinal strain were significantly lower in the HC group than in the control group. …

Circulation Journal, 2012

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11

Efficacy of Right Ventricular Free-Wall Longitudinal Speckle-Tracking Strain for Predicting Long-Term Outcome in Patients With Pulmonary Hypertension

Motoji Yoshiki , Tanaka Hidekazu , Fukuda Yuko , Ryo Keiko , Emoto Noriaki , Kawai Hiroya , Hirata Ken-ichi

… The present objective was to test the hypothesis that RV free-wall longitudinal speckle-tracking strain (RV-free), an independent echocardiographic predictor of hemodynamic RV performance, can predict long-term outcome. …

Circulation Journal, 2012

J-STAGE CrossRef
12

Normal Range of Left Ventricular 2-Dimensional Strain:– Japanese Ultrasound Speckle Tracking of the Left Ventricle (JUSTICE) Study –

Takigiku Kiyohiro , Takeuchi Masaaki , Izumi Chisato , Yuda Satoshi , Sakata Konomi , Ohte Nobuyuki , Tanabe Kazuaki , Nakatani Satoshi

… Background: To determine the normal range of left ventricular (LV) 2- dimensional (2-D) strain and vendor-specific differences, a multicenter prospective 2-D strain study endorsed by the Japanese Society of Echocardiography was conducted. … Methods and Results: 2-D speckle tracking analysis was performed on 817 healthy subjects (age range, 0–88 years); …

Circulation Journal 76(11), 2623-2632, 2012

J-STAGE CrossRef
13

Early diastolic mitral annular velocity at the interventricular septal annulus correctly reflects left ventricular longitudinal myocardial relaxation

Okada Kazunori , Mikami Taisei , Kaga Sanae , Onozuka Hisao , Inoue Mamiko , Yokoyama Shinobu , Nishino Hisao , Nishida Mutsumi , Matsuno Kazuhiko , Iwano Hiroyuki , Yamada Satoshi , Tsutsui Hiroyuki

… Using two-dimensional speckle tracking imaging, early diastolic myocardial strain rates (SR_[E]) were measured for the IS (IS-SR_[E]), LW(LW-SR_[E]) and entire LV myocardium (G-SR_[E]). …

European Heart Journal, Cardiovascular Imaging 12(12), 917-923, 2011-12-00

IR CrossRef
14

Investigation on Optimal Correlation Kernel Size for Ultrasonic Measurement of Heart Wall Motion at High Temporal Resolution [in Japanese]

Honjo Yasunori , Hasegawa Hideyuki , Kanai Hiroshi

近年,非侵襲かつ定量的な心筋運動計測にスペックルトラッキング法が用いられてきた,しかし,スペックルトラッキング法に関するパラメータである相関窓幅について十分に検討が行なわれていない.さらに,スペックルトラッキング法を適用する際のフレームレートが200Hz程度と低いため,心臓壁の急速な動きによってフレーム間のスペックルパターンの変化が大きくなり,心臓壁の速度の推定精度が低下する.われわれはこれまでに …

IEICE technical report. Ultrasonics 111(215), 7-11, 2011-09-19

CiNii Fulltext PDF - Limited Ichushi Web References (22)
15

Novel Strain Rate Index of Contractility Loss Caused by Mechanical Dyssynchrony : A Predictor of Response to Cardiac Resynchronization Therapy

IWANO Hiroyuki , YAMADA Satoshi , WATANABE Masaya , MITSUYAMA Hirofumi , NISHINO Hisao , YOKOYAMA Shinobu , KAGA Sanae , NISHIDA Mutsumi , YOKOSHIKI Hisashi , ONOZUKA Hisao , MIKAMI Taisei , TSUTSUI Hiroyuki

… We computed a novel index of LV contractility loss due to dyssynchrony (the strain rate (SR) dispersion index: SRDI) by using the speckle-tracking SR and compared the efficacy of the SRDI, time-delay indexes, and strain delay index (SDI), the previously reported index of wasted energy due to dyssynchrony, for predicting the acute response to CRT. … The standard deviation of time to peak velocity, or strain, was calculated as time-delay indexes. …

Circulation Journal 75(9), 2167-2175, 2011-08-25

J-STAGE Ichushi Web CrossRef References (33) Cited by (1)
16

Global longitudinal strain by two-dimensional speckle tracking imaging predicts exercise capacity in patients with chronic heart failure

KOU Seisyou , SUZUKI Kengo , AKASHI Yoshihiro J. , MIZUKOSHI Kei , TAKAI Manabu , IZUMO Masaki , SHIMOZATO Takashi , HAYASHI Akio , OHTAKI Eiji , OSADA Naohiko , OMIYA Kazuto , NOBUOKA Sachihiko , MIYAKE Fumihiko

Journal of echocardiography : official publication of the Japanese Society of Echocardiography 9(2), 64-72, 2011-06-28

References (27)
17

Right Ventricular Septal Pacing Preserves Global Left Ventricular Longitudinal Function in Comparison With Apical Pacing : Analysis of Speckle Tracking Echocardiography

INOUE Katsuji , OKAYAMA Hideki , NISHIMURA Kazuhisa , SAITO Makoto , YOSHII Toyofumi , HIASA Go , SUMIMOTO Takumi , INABA Shinji , SUZUKI Jun , OGIMOTO Akiyoshi , FUNADA Jun-ichi , HIGAKI Jitsuo

… This study was aimed to investigate the acute effect of RV apical (RVA) and septal pacing (RVS) on LV dyssynchrony and function using speckle tracking echocardiography. … LV dyssynchrony and global strain parameters were analyzed using speckle tracking echocardiography. … The QRS width and dyssynchrony indices by longitudinal and radial strain were significantly greater in RVA than in both the control and RVS. …

Circulation Journal 75(7), 1609-1615, 2011-06-25

J-STAGE Ichushi Web CrossRef References (22) Cited by (2)
18

Mechanical Dyssynchrony Is Not Everything of Substrate but Is Essential for Cardiac Resynchronization Therapy : Is Assessment of Mechanical Dyssynchrony Necessary in Determining CRT Indication? (Pro)

KANZAKI Hideaki

… However, advances in speckle tracking strain and real-time 3-D echocardiography have furthered the development of more sophisticated indices of dyssynchrony. …

Circulation Journal 75(2), 457-464, 2011-01-25

J-STAGE Ichushi Web CrossRef References (65) Cited by (2)
19

Validation of Longitudinal Peak Systolic Strain by Speckle Tracking Echocardiography With Visual Assessment and Myocardial Perfusion SPECT in Patients With Regional Asynergy

CIRCULATION JOURNAL 75(1), 141-147, 2011-00-00

IR
20

Tissue Doppler Imaging and 2D Speckle Tracking as a Predictor of Successful Outcomes after Catheter Ablation for Atrial Fibrillation

Tano Ayako , Okumura Yasuo , Watanabe Ichiro , Ohta Masakatsu , Kofune Masayoshi , Nagashima Koichi , Nakai Toshiko , Kasamaki Yuji , Hirayama Atsushi

… Recently, tissue Doppler imaging and 2D speckle tracking method have been used to evaluate the electrical and mechanical function of the left atrium (LA). … Before and 1–3 months after CA, we measured LA volume (LAV), E/E′, PA-TDI interval (from the initiation of the P wave to the A′ wave on the lateral left atrial tissue Doppler tracking), LA average strain by velocity vector imaging. …

Journal of Arrhythmia 27(Supplement), PJ1_039, 2011

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