Results 201 to 210 of about 48,074 (242)

Image quality and dose in spiral computed tomography

European Radiology, 1996
Image 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, R A, Meuli, F O, Bochud, C, Imsand, S, Raimondi, P, Schnyder, J F, Valley   +6 more
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[Defecography by spiral computed tomography].

La Radiologia medica, 1999
We 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, Fiorini G, Beghello A, Tornago S, Cicio G, DERCHI, LORENZO, Consigliere M, Resasco M.   +7 more
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Multislice spiral computed tomography angiography of mesenteric arteries

The Lancet, 2001
The introduction of multislice technology has improved and expanded the clinical applications of computed tomography angiography (CTA), and it is now possible to detect subtle vascular abnormalities. We optimised a high resolution CTA protocol to study the anatomy of mesenteric arteries with a multislice spiral CT scanner. We showed that multislice CTA
LAGHI, ANDREA, Riccardo Iannaccone, CATALANO, Carlo, PASSARIELLO, Roberto   +3 more
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Maximum volume coverage in spiral computed tomography scanning

Academic Radiology, 1996
Given a slice thickness and an image noise level, volume coverage in spiral computed tomography (CT) scanning was maximized with respect to detector collimation and table increment.The maximization was analytically performed on the basis of the following relationships: (1) With the half-scan interpolation method, the slice sensitivity profile (SSP) in ...
G, Wang, M W, Vannier
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[Spiral (helical) computer tomography].

Casopis lekaru ceskych, 1998
The introduction of spiral (helical) computed tomography (CT) has revolutionized the way established body CT examination are performed and has created new examinations as CT angiography. The production of overlapping images from single short X-ray exposure, the minimization of motion artefact and the suppression of respiratory misregistration have all ...
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Orbital Venous Anomalies Demonstrated by Spiral Computed Tomography

Ophthalmology, 1997
To describe the radiographic appearance of acute hemorrhage in orbital venous malformations and how spiral computed tomography (CT) can aid in the diagnosis of these lesions in patients with atypical presentations.Case series from the Eye Plastics and Orbital Service of Massachusetts Eye and Ear Infirmary.
P A, Rubin, H D, Remulla
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High-Pitch Spiral Computed Tomography

Investigative Radiology, 2011
computed tomography (CT) is considered the method of choice in thoracic imaging for a variety of indications. Sedation is usually necessary to enable CT and to avoid deterioration of image quality because of patient movement in small children. We evaluated a new, subsecond high-pitch scan mode (HPM), which obviates the need of sedation and to hold the ...
Michael M, Lell, Matthias, May, Paul, Deak, Sedat, Alibek, Michael, Kuefner, Axel, Kuettner, Henrik, Köhler, Stephan, Achenbach, Michael, Uder, Tanja, Radkow   +9 more
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Technical Foundations of Spiral Computed Tomography

1996
The Introduction of continuously rotating computed tomography (CT) measurements systems provided the technological basis for spiral CT. Slip rings are used to transfer the necessary electrical energy to the rotating gantry and to transmit the measured data from the rotating part to the computer system; the cables that were used traditionally in CT ...
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HELICAL (SPIRAL) COMPUTED TOMOGRAPHY

Gastroenterology Clinics of North America, 1995
Robert K. Zeman, Paul M. Silverman, Cirrelda Cooper, David I. Weltman, Susan M. Ascher, Richard H. Patt   +5 more
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Spiral computed tomography — a short overview

1998
During the late 1980s and at the beginning of the 90s, fast CT (computed tomography) scanners with an examination time of less than 1 second, based on the slipring technology, were introduced into clinical practice. These scanners offered the opportunity to have continuous data acquisition over a multitude of 360° scans, and it seemed feasible that ...
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