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Dual-beam versus single-beam depth profiling: same sample in same instrument.
Rapid Commun Mass Spectrom
December 2013
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL, 60439, USA.
Experimental validation of acoustic radiation force induced shear wave interference patterns.
Phys Med Biol
January 2012
Department of Radiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
A novel elasticity imaging system founded on the use of acoustic radiation forces from a dual beam arrangement to generate shear wave interference patterns is described. Acquired pulse-echo data and correlation-based techniques were used to estimate the resultant deformation and to visualize tissue viscoelastic response. The use of normal versus axicon focal configurations was investigated for effects on shear wave generation.
View Article and Find Full Text PDFOptical levitation particle delivery system for a dual beam fiber optic trap.
Appl Opt
January 2000
Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E-2C6, Canada.
We combine a radiation-pressure-based levitation system with a dual fiber, laser trapping system to demonstrate the potential of delivering single particles into the fiber trap. The forces versus position and the trajectory of the particle subjected to the laser beams are examined with an enhanced ray optics model. A sequence of video images taken from the experimental apparatus demonstrates the principle of particle delivery, trapping, and further manipulation.
View Article and Find Full Text PDFDual-beam ultrasound versus transit-time flow meter for intraoperative graft flow measurement during coronary artery bypass grafting.
Innovations (Phila)
October 2012
From the Department of Cardiothoracic Surgery, Boston Medical Center, Boston, MA.
Objective: : Assessment of graft flow during coronary artery bypass grafting (CABG) is increasingly practiced as a quality measure, particularly in patients undergoing minimally invasive or "off-pump" revascularization. Transit-time flow meters such as Transonic system (TS) are currently the most frequently used technology. The QuantixOR flow probe (QOR) is a novel technology comprised of dual-beam ultrasound transducer and a digital pulse-wave Doppler, allowing immediate, quantitative blood flow measurements.
View Article and Find Full Text PDFDo coronary bypass graft flows differ between on-pump and off-pump operations?
Ann Thorac Surg
June 2005
Department of Cardiovascular and Thoracic Surgery, University Clinics of Mont Godinne, Université Catholique de Louvain, Yvoir, Belgium.
Background: The aim of this study is to compare hemodynamic factors in coronary bypass grafts on-pump and off-pump.
Methods: Two propensity score-matched groups of 89 patients each including 408 dual beam Doppler flow measurements were compared. The study included only patent and single terminolateral bypass grafts.
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