In vivo, the position of the conductance catheter to measure vessel lumen cross-sectional area may vary depending on where the conductance catheter is deployed in the complex anatomical geometry of arteries, including branches, bifurcations, or curvatures. The objective here is to determine how such geometric variations affect the cross-sectional area (CSA) estimates obtained using the cylindri...

Many rodents tactually sense the world through active motions of their vibrissae (whiskers), which are regularly arranged in rows and columns (arcs) on the face. The present study quantifies several geometric parameters of rat whiskers that determine the tactile information acquired. Findings include the following. 1) A meta-analysis of seven studies shows that whisker base diameter varies with...

Geometric algorithms play an important role in computer graphics and digital image analysis. This paper makes an improvement of computing geometric properties of labelled images using arrays with reconfigurable optical buses (AROB). For an N · N image, we first design two constant time algorithms for computing the leftmost one problem and for the component reallocation problem. Then, several ge...

In this study, the influence of the geometric parameters on the optical absorption of gallium arsenide [GaAs] nanowire arrays [NWAs] has been systematically analyzed using finite-difference time-domain simulations. The calculations reveal that the optical absorption is sensitive to the geometric parameters such as diameter [D], length [L], and filling ratio [D/P], and more efficient light absor...

To determine the reliability of geometric (edge-detection) quantitative coronary angiographic analysis (QCA) of restenosis within a new Cordis tantalum stent, QCA and intracoronary ultrasound (ICUS) measurements were compared in both an experimental restenosis model and in the clinical follow-up of patients. In the experimental series, Plexiglas phantom vessels with concentric stenosis channels...

One of the most important optical signal processing operations is the optical Fourier transform (OFT). Of the arrangements for implementation of the OFT, perhaps the most flexible is that for the scaled optical Fourier transform (SOFT), as it allows control over the scale of the output Fourier transform distribution. By means of an analysis in cylindrical coordinates, we examine some of the pra...

An infinite series and some sporadic examples of large Cayley graphs with given degree and diameter are constructed. The graphs arise from arcs, caps and other objects of finite projective spaces. A simple finite graph Γ is a (∆, D)-graph if it has maximum degree ∆, and diameter at most D. The (∆, D)-problem (or degree/diameter problem) is to determine the largest possible number of vertices th...

Rise in temperature is inevitable orthopaedic drilling. Massive research had beendone the field of drilling to investigate effect cutting conditions, bone relatedparameters, and drill bit geometric parameters on heat generation minimum surrounding tissuesinjury. In present research, contradictory conclusions regarding conditions bitgeometric were observed. Minimum 31°C was achieved at speed 186...

A low-cost CCD camera system for imaging Coulter orifices ranging in diameter between 20 μm and 2 mm has been developed and tested. The imaging system incorporates a 6X magnifying lens for viewing the required range of Coulter orifices and LEDs (Light emitting diodes) lamp for back illuminating the orifices. Geometric optic calculations using Zemax® for the micro-lens interfaced with the camera...