scholarly journals Comparison of vector velocity imaging using directional beamforming and transverse oscillation for a convex array transducer

2014 ◽  
Author(s):  
Jørgen Arendt Jensen
Keyword(s):  
Transverse Oscillation ◽  
Velocity Imaging ◽  
Vector Velocity ◽  
Array Transducer

scholarly journals Transverse oscillation vector velocity estimation using a phased array transducer

2012 ◽  
Author(s):  
Jonne Marchery ◽  
Michael Johannes Pihl ◽  
Gert Seerup ◽  
Per Haugaard ◽  
Svetoslav Ivanov Nikolov ◽  
...  
Keyword(s):  
Phased Array ◽  
Velocity Estimation ◽  
Transverse Oscillation ◽  
Vector Velocity ◽  
Array Transducer

scholarly journals New developments in vector velocity imaging using the transverse oscillation approach

2013 ◽  
Author(s):  
Jørgen A. Jensen ◽  
Michael J. Pihl ◽  
Jacob B. Olesen ◽  
Peter M. Hansen ◽  
Kristoffer L. Hansen ◽  
...  
Keyword(s):  
Transverse Oscillation ◽  
New Developments ◽  
Velocity Imaging ◽  
Vector Velocity

Convex array vector velocity imaging using transverse oscillation and its optimization

2015 ◽  
Vol 62 (12) ◽  
pp. 2043-2053 ◽  
Author(s):  
Jørgen Arendt Jensen ◽  
Andreas Hjelm Brandt ◽  
Michael Bachmann Nielsen
Keyword(s):  
Transverse Oscillation ◽  
Velocity Imaging ◽  
Vector Velocity

P1771Right ventricular mechanical changes after septal myectomy for obstructive hypertrophic cardiomyopathy. Vector velocity imaging study

2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
H Badran ◽  
G Soltan ◽  
N Faheem ◽  
M Ezzat ◽  
M H Yacoub
Keyword(s):  
Hypertrophic Cardiomyopathy ◽  
Nyha Class ◽  
Imaging Study ◽  
Functional Class ◽  
Class Iii ◽  
Septal Myectomy ◽  
Cardiac Phenotype ◽  
Velocity Imaging ◽  
Vector Velocity ◽  
Surgical Myectomy

Abstract Objectives The impairment of right ventricular (RV) myocardial mechanics is evident in hypertrophic cardiomyopathy (HCM). It is independently influenced by LV mechanics and correlated to the severity of LV phenotype. We investigated the changes in RV global and regional deformation following surgical septal myectomy using vector velocity imaging (VVI). Methods 25 HCM patients, 68% males with mean age (34.5±12 years) were examined before and within two months after surgical myectomy using VVI. In addition to conventional echocardiographic parameters, peak systolic strain (εsys), strain rate (SR) and time to peak εsys (TTP) of regional RV free wall (RVFW) & septal walls were analyzed in longitudinal (long) directions from apical four chamber view and their (Δ)changes were calculated. Similar parameters were quantified in LV from apical 2 & 4 CH views. Intra-V-delay was defined as SD of TTP and inter-V dyssynchrony was estimated from TTP difference between the most delayed LV segment & RVFW. Results All study patients showed improvement of their functional class from NYHA class III to class I and reduction of LVOT gradient to below 20 mmHg except one patient who had 30 mmHg gradients at rest. There was significant reduction of septal thickness, left atrial diameter& volume, LVOT gradient, LVMI, severity of mitral regurgitation, tricuspid annular velocities (P<0.0001), RV diameter (P<0.02) and increase in LV internal dimensions (P<0.001) post myectomy. However, there was significant reduction of RV and LV systolic mechanics; RV global εsys % (from −16.1±4.4 to −12.9±2.9, P<0.0001) and LV global εsys %: from −11.6±2.8 to −9.4±2.2%, P<0.0001) respectively. The magnitude of reduction of RV strain (Δ RV εsys%, Δ SRsys) was directly correlated LV maximal wall thickness (r=0.46, P<0.01) and ΔRV dyssynchrony (TTP-SD), (r=0.4, P<0.05) and negatively correlated to age (r=−0.46, P<0.02), pre-op RV SRsys (r=−0.52, P<0.01) and pre-op LV EF% (r=−0.43, P<0.03). Meanwhile the reduction in RV diastolic mechanics: Δ RV SRe & SRa were directly correlated to PAP and LVOT gradient before surgery (r=0.62, P<0.002). Conclusion Despite improvement of patient functional status and reduction LVOT gradient, RV mechanics shows further deterioration after surgical myectomy. The magnitude of reduction is modestly related to cardiac phenotype and pre-op mechanical function.

A Comparison Between Compounding Techniques Using Large Beam-Steered Plane Wave Imaging for Blood Vector Velocity Imaging in a Carotid Artery Model

2016 ◽  
Vol 63 (11) ◽  
pp. 1758-1771 ◽  
Author(s):  
Anne E. C. M. Saris ◽  
Hendrik H. G. Hansen ◽  
Stein Fekkes ◽  
Maartje M. Nillesen ◽  
Marcel C. M. Rutten ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Plane Wave ◽  
Velocity Imaging ◽  
Vector Velocity ◽  
Wave Imaging
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