Rare-earth scatter fractions in chest radiography.
A beam stop technique was used to measure the densitometric scatter fractions under three regions of a humanoid chest phantom utilizing LaOBr and Gd2O2S screens. For these receptors, the scatter fractions under the lung and retrocardiac areas were 13%-36% lower than published values for CaWO4. In the mediastinal area, there was no significant difference between the CaWO4 and rare-earth phosphors. The use of grids reduces the scatter fraction in all three regions by 40%-75%. With and without a grid, radiographic contrast with Gd2O2S was measured utilizing simulated lesions placed above the lung and retrocardiac areas.
Petrone
T J
TJ
St. Vincent's Medical Center of Richmond, Staten Island, New York 10310.
Steidley
K D
KD
D006801:Humans; D008674:Metals, Rare Earth; D008961:Models, Structural; D013902:Radiography, Thoracic; D012542:Scattering, Radiation; D014963:X-Ray Intensifying Screens
D008674:Metals, Rare Earth