Abstract
C. Mertz and N. O. Young introduced the idea of using a Fresnel zone plate as a shadow-casting reticle, or coded aperture, in x-ray astronomy. More recently, considerable progress has been made toward using the zone-plate aperture for gamma-ray imaging in nuclear medicine. The most successful configuration has used an off-axis section of a zone plate in conjunction with a halftone screen. In this paper a variety of closely related coded apertures is discussed, including an annulus, an inverted zone plate, a spiral zone plate, and the Girard grill. In most cases, the technique of grid-coded subtraction is used to suppress the zero-order (DC) background light usually associated with zone-plate imaging.
Original language | English (US) |
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Pages (from-to) | 539-549 |
Number of pages | 11 |
Journal | Optical Engineering |
Volume | 13 |
Issue number | 6 |
DOIs | |
State | Published - Jan 1 1974 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Engineering(all)