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Observer performance in detecting multiple radiographic signals: prediction and analysis using a generalized ROC approach

Description: The theories of decision processes and signal detection provide a framework for the evaluation of observer performance. Some radiologic procedures involve a search for multiple similar lesions, as in gallstone or pneumoconiosis examinations. A model is presented which attempts to predict, from the conventional receiver operating characteristic (ROC) curve describing the detectability of a single visual signal in a radiograph, observer performance in an experiment requiring detection of more tha… more
Date: January 1, 1975
Creator: Metz, C. E.; Starr, S. J. & Lusted, L. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Indocyanine green labeled with /sup 123/I for dynamic studies of the hepato-biliary system. [/sup 131/I, /sup 125/I]

Description: This report summarizes the results to develop an iodine-123 labeled agent for dynamic studies of the hepato-biliary system. Iodine-123 is an ideal nuclide for radiopharmaceuticals, because of its short half-life (T/sub /sup 1///sub 2// = 13.3 hr); its decay with a high abundance (83%) of 159 keV photons; and the reduced patient radiation exposure (a factor of 100 less than iodine-131). Indocyanine green, a tricarbanocyanine dye, was introduced by Heseltine and co-workers in 1956, has several ch… more
Date: January 1, 1975
Creator: Lambrecht, R. M.; Ansari, A. N.; Wolf, A. P. & Atkins, H. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Positron emission camera for transverse section tomography

Description: A transverse section tomographic positron camera is discussed for quantitative imaging of the heart in gated studies using positron emitters such as /sup 82/Rb, /sup 68/Ga, and /sup 18/F. The system consists of a circular ring of 288 NaI(Tl) crystals 8 mm x 30 mm x 50 mm. The crystals are read out by coded light pipes that permit complete data transfer with only 72 photomultipliers. This and other features lead to an economic design that permits 6 to 9 mm FWHM over sections having 40 cm diamete… more
Date: December 1, 1975
Creator: Derenzo, S. E.; Zaklad, H. & Budinger, T. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Production of radionuclides /sup 123/I, /sup 77/Br for nuclear medicine with high energetic /sup 4/He particles

Description: The feasibility of using 50-102 MeV alpha particles to produce the /sup 123/Xe ..-->.. /sup 123/I and /sup 77/Kr ..-->.. /sup 77/Br generators were evaluated using targets of natural sodium iodide and sodium bromide. Thick target yields of direct and indirect produced /sup 123/I and /sup 77/Br were measured. Production rates for other resulted radionuclides were also measured, and the level of indirectly produced /sup 125/I impurity were determined.
Date: January 1, 1975
Creator: Helus, F; Maier-Borst, W; Lambrecht, R M & Wolf, A P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Climate Measurement Plan for the Central Receiver Pilot Plant and the Solar Thermal Test Facility

Description: This report presents the results of the Climatic Measurement Requirements Study for Solar Thermal Conversion Power Plants performed by The Aerospace Corporation under contract to the Solar Thermal Branch of the Energy Research and Development Administration.
Date: July 1, 1975
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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