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C Vyborny

Publications and source records attributed to C Vyborny.

5 recordsLinked to original sources
PubMed1994

Technical advances in chest radiography.

Chest radiography is the most frequently performed radiologic imaging study and also one of the most challenging. The technical aspects of the conventional chest radiographic examination have been studied extensively, and the effects of various parameters on the quality of chest radiographs have been described. However, new approaches to image acquisition and display have been introduced in the last decade, and many circumvent the limitations of conventional screen-film studies. Thus, a number of practical issues must be considered in the selection of chest radiographic equipment for modern clinical practice. In this review, we describe several recent advances in both conventional and digital technologies that can improve the diagnostic quality of chest radiographs.

Humans↗
PubMed1985

Gallium accumulation in the stomach. A frequent incidental finding.

Accumulation of tracer by the stomach is a frequent incidental occurrence on gallium scans. Gastric concentration of Ga-67 equal to or greater than that seen in the liver was observed in approximately 10% of patients in a large series. Although a few of these patients had known or subsequently demonstrated gastric pathologic conditions, most had no clinically or radiographically identifiable gastric disease.

Gallium Radioisotopes↗
PubMedDate not supplied

Percutaneous extraction of two deeply lodged foreign bodies.

Interventional radiologists have long been familiar with percutaneous removal of intravascular foreign bodies. Catheter fragments and other foreign bodies can, however, also lie within extravascular soft tissues and should be amenable to extraction by similar techniques. We successfully removed fractured catheter fragments embedded in the soft tissues of 2 patients. In both cases, percutaneous needle puncture under radiologic guidance was used to gain directed access. Technical considerations of this method and its potential application are discussed.

Adolescent↗
PubMedDate not supplied

Monte Carlo simulation studies of detectors used in the measurement of diagnostic x-ray spectra.

Accurate determination of diagnostic x-ray spectra requires, among many other technical considerations, correction of the experimental data for the energy-dependent response of the x-ray detector. In this study, we investigated the energy response of three types of detectors (intrinsic germanium, lithium-drifted silicon, and sodium iodide) commonly used in the diagnostic energy range. We used a Monte Carlo simulation technique to compute photopeak efficiencies, escape peak losses, and Compton fractions as a function of incident x-ray energy for a variety of detector thicknesses and diameters. Calculated responses were compared with experimental results obtained for the Ge and Si(Li) detectors. The measurements, in which we used fluorescent x ray to simulate the monoenergetic beams assumed for the calculations, indicate good agreement between theoretical and experimental approaches. Techniques for correction of measured spectra for the known response of the detector were also evaluated.

Germanium↗