نتایج جستجو برای: strain imaging
تعداد نتایج: 669097 فیلتر نتایج به سال:
PURPOSE Percutaneous thermal ablation is increasingly being used to destroy hepatic tumors in situ. The success of ablative techniques is highly dependent on adequate ablation zone monitoring, and ultrasound-based strain imaging could become a convenient and cost-effective means to delineate ablation zone boundaries. This study investigates in vivo electrode displacement-based strain imaging fo...
Recognizing the critical need for standardization in strain imaging, in 2010, the European Association of Echocardiography (now the European Association of Cardiovascular Imaging, EACVI) and the American Society of Echocardiography (ASE) invited technical representatives from all interested vendors to participate in a concerted effort to reduce intervendor variability of strain measurement. As ...
Background Spin-echo based cardiac diffusion tensor imaging (DTI) is highly sensitive to myocardial strain [1]. Imaging during systolic contraction requires precise planning of the sequence timing [2]. Second order motion compensated diffusion encoding has recently been proposed for small animal imaging [3] to reduce the impact of myocardial strain on the diffusion tensor. It is the objective o...
BACKGROUND Aging is accompanied by an alteration in myocardial contractility. However, its noninvasive detection is difficult. The effect of chronic exercise on this decrease is unknown. Murine models of senescence are increasingly used to test therapies in aging. We tested whether strain rate imaging detected left ventricular (LV) systolic dysfunction in aging mice and was able to assess a pot...
PURPOSE OF REVIEW Right ventricular (RV) function is an independent determinant of prognosis in a number of pathologies, but its accurate quantification by echocardiography remains a challenge. With the evolving clinical utility of RV strain and strain imaging, several studies have used it to investigate normal and pathologic conditions. However, marked shape adaptations of the RV and the wide ...
OBJECTIVES Asymptomatic rejection after heart transplant is difficult to detect by noninvasive methods. The present study investigated the efficacy of echocardiographic strain and the strain rate imaging method in detecting rejection after pediatric heart transplant. MATERIALS AND METHODS Fourteen pediatric patients with heart transplant were examined both with endomyocardial biopsy and strai...
In vivo imaging of small animals is a rapidly developing field. However, the potential of global imaging of infectious processes in animal models remains poorly explored. We used magnetic resonance imaging (MRI) to follow the development and regression of inflammatory lesions caused by infection by Klebsiella pneumoniae in mouse lungs. A virulent strain caused an intense inflammation within 2 d...
1 CHAPTER 1: Strain Imaging of Internal Deformation 4 1.
BACKGROUND Myocardial strain imaging using echocardiography can be a cost-effective method to quantify ventricular wall motion objectively, but few studies have compared strain measured with echocardiography against magnetic resonance imaging (MRI) in small animals. METHODS AND RESULTS We compared circumferential strain (CS) and radial strain (RS) measured with echocardiography (velocity vect...
INTRODUCTION: Comprehensive characterization of myocardial viability continues to be of diagnostic interest to clinicians. Magnetic resonance (MR) tagging is considered the gold standard imaging tool for noninvasive assessment of functional viability in the form of mechanical strain tensors [1]. Principal strain orientations, which correspond to directions of maximal deformations (stretching, c...
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