9 research outputs found
Diastolic time – frequency relation in the stress echo lab: filling timing and flow at different heart rates
A cutaneous force-frequency relation recording system based on first heart sound amplitude vibrations has been recently validated. Second heart sound can be simultaneously recorded in order to quantify both systole and diastole duration
Acoustic Radiation Force Impulse Imaging of Mechanical Stiffness Propagation in Myocardial Tissue
Kinematic analysis of diastolic function using the freely available software Echo E-waves – feasibility and reproducibility
Kinematic Modeling-based Left Ventricular Diastatic (Passive) Chamber Stiffness Determination with In-Vivo Validation
Kinematic Modeling Based Decomposition of Transmitral Flow (Doppler E-Wave) Deceleration Time into Stiffness and Relaxation Components
Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics
Synthesis, structural, magnetic and magnetocaloric properties of La0.8Sr0.2MnO3 nanoparticles
Multiple Yellow Plaques Assessed by Angioscopy With Quantitative Colorimetry in Patients With Myocardial Infarction
Review of Terahertz Tomography Techniques
Terahertz and millimeter waves penetrate various dielectric materials, including plastics, ceramics, crystals, and concrete, allowing terahertz transmission and reflection images to be considered as a new imaging tool complementary to X-Ray or Infrared. Terahertz imaging is a well-established technique in various laboratory and industrial applications. However, these images are often two-dimensional. Three-dimensional, transmission-mode imaging is limited to thin samples, due to the absorption of the sample accumulated in the propagation direction. A tomographic imaging procedure can be used to acquire and to render three-dimensional images in the terahertz frequency range, as in the optical, infrared or X-ray regions of the electromagnetic spectrum. In this paper, after a brief introduction to two dimensional millimeter waves and terahertz imaging we establish the principles of tomography for Terahertz Computed tomography (CT), tomosynthesis (TS), synthetic aperture radar (SAR) and time-of-flight (TOF) terahertz tomography. For each technique, we present advantages, drawbacks and limitations for imaging the internal structure of an object.Development and Optimization of THz NDT on Aeronautics Composite Multi-layered Structur