Attenuation zone plate

Details Attenuation zone plate Attenuation zone plate

1981-10-29

1984-11-06

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

378 2, 378150, 378159, G01T 1164, G21K 300

Patent

active

044814194

ABSTRACT:
An attenuation zone plate for coded-aperture imaging of a radiation source has mercury contained within a wedge-shaped chamber in a plastic housing. Reservoir and relief cavities facilitate filling the housing with mercury and accommodate changes in mercury volume. Lead plates positioned on the perimeter of the housing provide a field of view mask. In one embodiment, the housing cover pivots to vary the wedge angle. Advantages include greater facility in precision manufacturing and greater attenuation pattern flexibility.

REFERENCES:
patent: 2871367 (1959-01-01), Gournay
patent: 3011057 (1961-11-01), Anger
patent: 3660664 (1972-05-01), Pasmeg
patent: 3755672 (1973-08-01), Edholm et al.
patent: 3961191 (1976-06-01), Stoner et el.
patent: 4107730 (1977-04-01), Barrett
patent: 4165462 (1979-08-01), Macovski et al.
patent: 4417143 (1983-11-01), Haas et al.
patent: 4419577 (1983-12-01), Guth
Dowdey, "Coded Apertures for Nuclear Medicine Imaging", Applied Radiology/NM, Jul.-Aug. 1977, pp. 145-169.

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