Results 291 to 300 of about 140,209 (335)
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COMPUTATION OF RELATIVE ROTATIONS IN SPIRAL HORSESHOES
International Journal of Bifurcation and Chaos, 1992An algorithm is presented for computing the relative rotations of orbits in a suspension of Smale horseshoes consisting of n stripes in spiral configuration. Bifurcational precedence relations in the creation of such horseshoes may thus be more readily determined. An application to a driven oscillator is discussed.
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Spiral Waves in a Computer Model of Cardiac Excitation
Pacing and Clinical Electrophysiology, 1994Spiral excitation fronts have been demonstrated in association with reentry in a computer model of propagated excitation. Fronts were initiated by the reentrant circuits but the spiral configurations themselves occurred outside the circuits. Excitation initiated near the initial portion of reentrant circuits propagated greater distances during a ...
J A, Abildskov, R L, Lux
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SPIRAL COMPUTED TOMOGRAPHY IN THE EVALUATION OF PULMONARY EMBOLISM
Clinics in Chest Medicine, 1999Determining the presence or absence of thromboembolic disease can often be problematic. Traditional diagnostic algorithms are reviewed and discussed. Spiral CT technology allows a relatively noninvasive visualization of the pulmonary vasculature and is a promising new diagnostic modality for acute and chronic thromboembolic disease. Its potential roles
R J, Lipchik, L R, Goodman
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System performance of multislice spiral computed tomography
IEEE Engineering in Medicine and Biology Magazine, 2000Multislice spiral CT offers many new possibilities for clinical CT imaging. Drastically increased scan speeds and z-resolution, respectively, as well as applications such as cardiac CT that have become feasible for the first time in routine clinical use.
T O, Fuchs +2 more
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Image quality and dose in spiral computed tomography
European Radiology, 1996Image quality and dose produced by a spiral CT with various pitch values were investigated on the basis of test-object images and measurements of CT dose indexes. No major difference in image quality or dose was observed when comparing sequential and spiral mode acquisition with a pitch of one.
F R, Verdun +6 more
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Spiral Problems For An Electronic Computer
Journal of the Highway Division, 1965A set of parameter equations is developed to define any highway or bridge spiral offering a transition between a tangent and a circle or between two circles of different radii. These equations are then used in sets of procedures to help solve intersections of spirals with straight, circular, or spiral lines.
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[Defecography by spiral computed tomography].
La Radiologia medica, 1999We investigated the possible role of helical CT defecography in pelvic floor disorders by comparing our results with those of conventional defecography.Our series consisted of 90 patients, namely 62 women and 28 men, ranging in age 24-82 years. They were all submitted to conventional defecography, and 18 questionable cases were also studied with ...
Ferrando R +7 more
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Logarithmic Spirals and Computer Art
1989Interesting geometric patterns are obtained by mapping a rectangular region in one coordinate system onto an annular region in another coordinate system. The mapping involves logarithmic spirals and several examples are presented which involve interlocking spirals, cubes and dragon patterns.
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Spiral: Automated Computing for Linear Transforms
AIP Conference Proceedings, 2010Writing fast software has become extraordinarily difficult. For optimal performance, programs and their underlying algorithms have to be adapted to take full advantage of the platform’s parallelism, memory hierarchy, and available instruction set. To make things worse, the best implementations are often platform‐dependent and platforms are constantly ...
Markus Püschel +3 more
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High resolution spiral computed tomography of the pancreas.
Rays, 2001Computed tomography (CT) is a very useful tool in the assessment of pancreatic disease. Searching for subtle signs, as in chronic pancreatitis or staging of adenocarcinoma, high spatial and contrast resolution is needed. The high resolution computed tomography (HRCT) technique for pancreatic scans, and its evolution from dynamic CT to multislice spiral
Brizi Mg +5 more
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