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- W2029768820 abstract "The increasing number and variety of studies in clinical diagnosis and research which depend on the external measurement of the amount and distribution of an administered radioactive isotope in vivo make the design and capability of the detector of major importance. The optimization of localization characteristics and efficiency could be ideally met by the design of individual detector systems for each different study. This, however, is not feasible when a large number of different types of studies are competing for instrumentation and staff time. A counter system has been designed which has an adjustable focal distance and volume sensitivity to permit a selection of the best combination of parameters for a variety of scanning situations involving variations in size, depth, and activity of the volume scanned. The design includes four separate individually shielded and collimated scintillation crystals of thallium-activated cesium iodide, approximately 4 inches in length and 1.5 inches in diameter, suspended from the corners of a square whose diagonal can be varied from approximately 4 to 20 inches. The individual crystals can be angled so as to vary the depth of the common point of focus. The use of elongated crystals provides some inherent directionality even before the addition of shielding and collimation. The design permits the axes of opposite crystals to be made co-linear so as to provide two pairs of coincidence counters for brain-scanning work. The system can be mounted on the frame of the existing high-energy scanner (1, 2) to permit scanning of whole-body areas. Analytical expressions have been derived to enable the localization response curve of the system to be computed as a function of such parameters as (a) crystal dimensions, (b) collimator thickness, (c) angle of taper of collimator cone, (d) attenuation coefficient of collimator material, (e) energy of gamma radiation, and (f) separation and angle of the crystals. On the basis of these computations and experimental measurements on the prototype system, optimized combinations of the parameters are selected for various scanning situations. Details of the design, computations, measurements, and criteria for evaluation will be presented." @default.
- W2029768820 created "2016-06-24" @default.
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- W2029768820 date "1962-01-01" @default.
- W2029768820 modified "2023-10-14" @default.
- W2029768820 title "A Scintillation Counter System with Adjustable Isocount Characteristics" @default.
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- W2029768820 doi "https://doi.org/10.1148/78.1.114a" @default.
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