Results 271 to 280 of about 663,020 (341)

High-helical-pitch, cone-beam computed tomography

Physics in Medicine and Biology, 1998
The object of a helical, cone-beam computed tomography, HCBCT, system is faster scan times for the volume of interest for a patient. The maximum helical-pitch that still produces good quality images limits the reduction in scan time. Although this is a three-dimensional problem, an extension of the completeness condition for a two-dimensional fan-beam ...
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High temporal resolution for multislice helical computed tomography

Medical Physics, 2000
Multislice helical computed tomography (CT) substantially reduces scanning time. However, the temporal resolution of individual images is still insufficient for imaging rapidly moving organs such as the heart and adjacent pulmonary vessels. It may, in some cases, be worse than with current single‐slice helical CT.
K, Taguchi, H, Anno
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Multidetector helical computed tomography of the liver

Academic Radiology, 2004
Abstract Rationale and objectives The purpose of this study was to compare hepatic enhancement characteristics using two different contrast media injection protocols with multidetector helical computed tomography. Materials and methods Twenty-three patients with known or suspected liver lesions scheduled to undergo biphasic hepatic multidetector
Jason C Smith, Rendon C Nelson, Edgardo I Gimenez, Joan P Heneghan, John Thomas, David M Delong, Lesa M Kurylo   +6 more
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Regularized approach in 3D helical computed tomography

Proceedings of the Second Joint 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] [Engineering in Medicine and Biology, 2002
Helical tomography yields less invasive examination at the expense of degradations in the precision of the reconstructions and the possible presence of specific artifacts. This study presents a new reconstruction method that produces significant enhancement in the precision of helical tomographic images at a reasonable computer cost.
M. Allain, Y. Goussard, J. Idier
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A reconstruction method for helical computed tomography

1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2002
This paper presents a method for volumetric reconstruction from helical computerized tomography (H-CT) data which are collected with a fan beam source. An interpretation of the H-CT data in terms of the axial computerized tomography (A-CT) data is provided.
A. Rischal, S.S. Young, M. Soumekh
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Imaging of aortic dissection by helical computed tomography (CT)

European Radiology, 2004
Aortic dissection is the most frequent cause of aortic emergency, and its outcome is still frequently fatal. The management of this pathology has changed with the development of endovascular means. Nowadays, imaging modalities are helpful in management decision-making by providing information such as identification of entry tears along the aorta and ...
Serge, Willoteaux, Christophe, Lions, Virginia, Gaxotte, Ziad, Negaiwi, J P, Beregi   +4 more
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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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Hepatocellular-Cholangiocarcinoma: Helical Computed Tomography Findings in 30 Patients

Journal of Computer Assisted Tomography, 2003
To report the helical multiphasic computed tomography (CT) findings in 30 patients with hepatocellular-cholangiocarcinoma.We evaluated age, gender, tumor risk factors, serum tumor markers, symptoms, and tumor morphology and enhancement on helical multiphasic CT in 30 patients.Twenty-six of 30 patients (86%) were men.
Osama, Ebied, Michael P, Federle, Arye, Blachar, Giuseppe, Brancatelli, Luigi, Grazioli, Dominique, Cazals-Hatem, Federica, Dondero, Valérie, Vilgrain   +7 more
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Incarcerated obturator hernia: early diagnostic using helical computed tomography

Hernia, 2007
Obturator hernia is a rare event with poor clinical signs. Delayed diagnosis is a cause of increased mortality due to ruptured gangrenous bowel. We report a case of incarcerated obturator hernia which highlights the usefulness of computed tomography (CT) scanning in diagnosing this condition.
J-P, Avaro, N, Biance, P-H, Savoie, T, Peycru, G, Pauleau, P, Richez, R, Charpentier, P, Balandraud   +7 more
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Helical computed tomography for the evaluation of tracheal stenosis

The Annals of Thoracic Surgery, 1995
Helical computed tomography with multiplanar reconstruction (CT/MPR) was used to study proximal airway stenosis.Twenty-eight helical CT/MPR studies were obtained in 25 patients with known or suspected stenosis of the trachea or main bronchi. Computed tomographic results were compared with planar tomograms and bronchoscopic evaluation of the airway.CT ...
R I, Whyte, L E, Quint, E A, Kazerooni, P N, Cascade, M D, Iannettoni, M B, Orringer   +5 more
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