Although 2-dimensional echocardiographic strain imaging cost-effectively and objectively quantifies ventricular wall motion, only 1 small study has directly compared strain measured with echocardiography against MRI (MRI) in mice. Using a different speckle-tracking algorithm (velocity vector imaging [VVI]), we compared circumferential (CS) and radial strain (RS) to displacement encoding with st...

This paper presents a novel method to determine the complete velocity vector of a moving target using a single Synthetic Aperture Radar (SAR) sensor. The method exploits the structure of the returned echo from a moving target: in the slow-time frequency domain, it is a scaled and shifted replica of the antenna radiation pattern immersed in Gaussian noise; the scale and the shift are related wit...

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 ...

BACKGROUND AND AIM Effects of atrial fibrillation (AF) and its ablative treatment on LV torsion have not yet been fully investigated. This study aimed to examine whether AF patterns of LV contraction and its ablative correction can exert a significant impact on LV torsion by velocity vector imaging (VVI). METHODS This case-control study conducted in Rajaie Cardiovascular, Medical and Research...

Placental dysfunction resulting in intrauterine growth restriction (IUGR) is a common complication of pregnany and severe IUGR, with ensuing fetal hypoxia is an important cause of perinatal mortality and morbidity. Doppler studies of fetal and maternal vessels are routinely used for fetal surveillance and alterations in fetal venous blood flow has been demonstrated as a late sign of fetal compr...

Understanding of the dynamics of the heart is required for the prevention and treatment of cardiac related diseases as well as for the design of pacemakers and artiicial hearts. We present a new method for the analysis of myocardium motion and deformation based on the study of velocity encoded NMR images. By applying a few mathematical operators on the semi{automatically segmented image of the ...

conclusions results suggest that these methods cannot be interchanged, and vvi showed significantly lower lv peak twist, peak twisting rate and peak untwisting rate. however, when lv twist and lv twisting rates were normalized to lv length, values were comparable for both imaging techniques. results twist degree was significantly lower in the vvi group than in the tdi group (p = 0.008, r = 0.56...

We present ultrahigh-resolution measurements of state-to-state inelastic differential cross sections for NO-Ne and NO-Ar collisions, obtained by combining the Stark deceleration and velocity map imaging techniques. We show that for counterpropagating crossed beam geometries, the effect of the velocity spreads of the reagent beams on the angular resolution of the images is minimized. Furthermore...

Our understanding of left ventricular (LV) function and its description using echocardiographic techniques continues to evolve. From measurement of systolic function by ejection fraction, Tissue Doppler parameters are now used to evaluate systolic and diastolic function in the shortand long axis. However, it is now recognized that LV function also involves twisting or torsion. LV torsion result...