نتایج جستجو برای: strain imaging

تعداد نتایج: 669097  

2000
H. Ermert

With the Phase-Root-Seeking algorithm a new and very fast algorithm for time delay estimation was recently introduced, permitting the estimation of strain images in real-time. In this paper the accuracy of the real-time strain imaging concept is investigated by the most rigorous approach, i.e. a comparison to the theoretical accuracy limit: the Cramer-RaoLower-Bound. Simulations show, that this...

2016
Andrew D Scott Pedro Ferreira Sonia Nielles-Vallespin Dudley J Pennell David Firmin

Background Cardiac diffusion tensor imaging (cDTI) is often performed using a stimulated echo sequence with monopolar diffusion encoding [1,2]. While diffusion measured with this sequence is modified by strain [1] the standard strain model predicts that the strain effects can be eliminated by imaging at one of two “sweet-spots” in the cardiac cycle where the effects of strain cancel [3]. Howeve...

Journal: :Circulation journal : official journal of the Japanese Circulation Society 2006
Tomomi Hozumi Takahide Ito Michihiro Suwa Yasuhiko Sakai Yasushi Kitaura

BACKGROUND This study examined the effects of dual-chamber pacing (DDD) on regional myocardial deformation, as determined by echocardiographic strain and strain rate (SR) imaging, in patients with hypertrophic obstructive cardiomyopathy (HOCM). METHODS AND RESULTS Fourteen patients (11 men, 3 women; mean age 55 +/-16 years) who had been on long-term DDD (mean period 7.4 +/- 2.1 years) underwe...

Journal: :The Review of scientific instruments 2014
D Fan L Lu B Li M L Qi J C E F Zhao T Sun K Fezzaa W Chen S N Luo

Real time, in situ, multiframe, diffraction, and imaging measurements on bulk samples under high and ultrahigh strain-rate loading are highly desirable for micro- and mesoscale sciences. We present an experimental demonstration of multiframe transient x-ray diffraction (TXD) along with simultaneous imaging under high strain-rate loading at the Advanced Photon Source beamline 32ID. The feasibili...

Journal: :Archives of Iranian medicine 2014
Mozhgan Parsaee Bahieh Moradi Maryam Esmaeilzadeh Majid Haghjoo Hooman Bakhshandeh Leila Sari

BACKGROUND This study attempted to identify the role of combined conventional and novel echocardiographic techniques in evaluation of left atrial (LA) function to predict the postoperative atrial fibrillation (POAF). METHODS In this cross-sectional study, subjects with sinus rhythm who were candidates for CABG were enrolled. Preoperative LA function was evaluated by conventional echocardiogra...

Journal: :Cardiovascular Ultrasound 2007
Arco J Teske Bart WL De Boeck Paul G Melman Gertjan T Sieswerda Pieter A Doevendans Maarten JM Cramer

Recent developments in the field of echocardiography have allowed the cardiologist to objectively quantify regional and global myocardial function. Regional deformation (strain) and deformation rate (strain-rate) can be calculated non-invasively in both the left and right ventricle, providing information on regional (dys-)function in a variety of clinical settings. Although this promising novel...

2017
Xiaofeng Yang Mylin Torres Stephanie Kirkpatrick Walter J Curran Tian Liu

PURPOSE Lymphedema, a swelling of the extremity, is a debilitating morbidity of cancer treatment. Current clinical evaluation of lymphedema is often based on medical history and physical examinations, which is subjective. In this paper, the authors report an objective, quantitative 2D strain imaging approach using a hybrid deformable registration to measure soft-tissue stiffness and assess the ...

Journal: :Echocardiography 2009
Laurens F Tops Victoria Delgado Jeroen J Bax

In recent years, concerns have been raised about possible harmful effects of long-term right ventricular (RV) apical pacing. These detrimental effects may be related to changes in left ventricular (LV) mechanics during RV apical pacing. As a consequence, alternative RV pacing sites have been proposed, and in selected patients an upgrade from RV to biventricular pacing may be considered. Novel t...

Journal: :Circulation journal : official journal of the Japanese Circulation Society 2010
Aylin Tugcu Ozlem Yildirimtürk Yelda Tayyareci Cemsid Demiroglu Saide Aytekin

BACKGROUND The aims of this study were to evaluate subclinical regional right ventricular (RV) dysfunction in newly diagnosed obstructive sleep apnea (OSA) patients without systemic and pulmonary arterial (PA) hypertension, and to correlate OSA severity to RV dysfunction, using both velocity vector imaging (VVI)-derived strain imaging and tissue Doppler imaging (TDI). METHODS AND RESULTS The ...

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