نتایج جستجو برای: contrast radiography
تعداد نتایج: 410782 فیلتر نتایج به سال:
RATIONALE AND OBJECTIVES To examine the effectiveness and suitability of a quality control (QC) phantom for a routine QC program in digital radiography. MATERIALS AND METHODS The chest phantom consists of copper and aluminum cutouts arranged to resemble the appearance of a chest. Performance of the digital radiography (DR) system is evaluated using high and low contrast resolution objects pla...
Neutron radiography has long been used in various scientific investigations and industrial applications that require thermal neutrons for characterization. Different kinds of sources such as radioactive sources, portable and accelerator based neutron generators and nuclear reactors can be used to provide thermal beam of neutrons suited for neutron radiography. Among the different varieties of n...
High Energy Density (HED) experiments at the HHT experimental site of the GSI Plasma Physics Group employ intense, energetic uranium beams in order to study new regimes of the equation of state (EOS) of matter under extreme conditions. A key parameter to be determined in these experiments is the density distribution in the irradiated and heated target. Determining the spatial and density distri...
BACKGROUND Redislocation is a dreaded complication after reduction of developmental dysplasia of the hip (DDH) in young children. While early detection facilitates urgent reoperation, delayed revisions are more complicated. Despite the weak evidence, an axial postoperative imaging tool is recommended. This study's goal is to compare the effectiveness of conventional pelvic radiography alone and...
OBJECTIVE To investigate the methods of diagnosis of fish bone foreign body in the esophagus and suggest a diagnostic protocol. STUDY DESIGN Prospective cohort study. METHODS A prospective study was performed on 286 patients with a history of fish bone foreign body impaction. Among them, 88 patients had negative findings in the oral cavity and laryngopharynx. Subsequent radiologic assessmen...
Dual-energy (DE) breast x-ray imaging involves acquiring images using a lowand high-energy x-ray spectral pair. These images are then subtracted with a weighting factor that eliminates the soft-tissue signal variation present in the breast leaving only contrast that is attributed to an exogenous imaging agent. We have previously demonstrated the potential for silver (Ag) as a contrast material ...
BACKGROUND Lumbar spine radiography has limited diagnostic value but low radiation dose compared with computed tomography (CT). The average effective radiation dose from lumbar spine radiography is about 1.1 mSv. Low-dose lumbar spine CT may be an alternative to increase the diagnostic value at low radiation dose, around 1 mSv. PURPOSE To determine the optimal settings for low-dose lumbar spi...
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