TY - JOUR
AU - Mike D. Tipton , James E. Dowdey , Frederick J. Bonte , and Henry J. Caulfield
AB -  Nuclear Medicine A two-step autoradiographic imaging technique utilizing a coded aperture in the form of a lead on-axis Fresnel zone plate is presented. Several isotopefilled plastic phantoms were successfully imaged. These images contain tomographic information of very good quality. The advantages and disadvantages of the technique are discussed. INDEX TERMS: Radionuclide Imaging, apparatus and equipment • Radionuclide Imaging, technique. Tomography Radiology 112: 155-158, July 1974 • of the rapid increase in nuclear mediB cine procedures, any imaging system which E CAU SE could improve resolution or' sensitivity with respect to currently available imaging systems or provide tomographic information should be investigated (2-5). "Coded" apertures provide an imaging system which, in addition to tomographic information, offers the possibility of improved resolution and sensitivity over conventional collimated scintillation cameras. A Fresnel zone plate, consisting of alternately opaque and transparent concentric rings of equal area, was proposed by Mertz and Young (I) for visualizing astronomical x-ray star patterns. However, star patterns consist essentially of point-source objects. Attempts to image extended objects led Barrett et at. to use an off-axis Fresnel zone plate with a second aperture, a half-tone screen, in order to reduce noise in the image. With the half-tone screen, 
TI - Coded Aperture Imaging Using On-Axis Fresnel Zone Plates and Extended Gamma-Ray Sources
JF - Radiology
DA - 1974-07-01
UR - https://www.deepdyve.com/lp/radiological-society-of-north-america-inc/coded-aperture-imaging-using-on-axis-fresnel-zone-plates-and-extended-EX0XqzkhsB
VL - 112
IS - 
DP - DeepDyve
ER -