Affiliations: Department of Biomedical Engineering, University of Akron, Akron, Ohio 44325 | Department of Biomedical Engineering, University of Tennessee, Memphis, Tennessee 38163 | Department of Physics, University of Cincinnati, Cincinnatti, Ohio, 45221
Note: [] Now with the Department of Physiology, School of Medicine, Johns Hopkins University, Baltimore,MD 21205.
Note: [] Now with Picker International, Inc., 595 Miner Rd, Highland Heights, OH 44143.
Abstract: The goal of this study is to develop high resolution imaging detectors with applications in digital radiography and computed tomography. A physical treatment aimed at a better understanding of the line-spread function response of kinestatic charge detector (KCD) gas media, using dopants with permanent electric dipoles, is presented. Experimental results were obtained by operating a KCD krypton-filled detector at pressures up to 60 atm and constant electric field-to-gas density ratio doped with small amounts of polar or nonpolar polyatomic molecules with low or high ionization potential. The results clearly indicate that the addition of dopants having both low ionization potential and high dipole moment significantly enhance the imaging signal quality. An analysis of the experimental results aimed at providing a plausible interpretation of the reported observations is offered.
