Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1986-07-21
1987-10-13
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250368, 2504831, 2504861, G01T 1202, G01T 1164
Patent
active
047000740
ABSTRACT:
In order to match the trends and demands of modern nuclear medicine, a new scintillation camera head is designed, which features a new crystal-light guide-collimator unit for a single crystal scintillation camera. The effective crystal thickness is increased by crystal teeth designed as quadrilateral truncated crystal pyramids. The basis of each of these teeth is settled on top of a crystal plate of conventional thickness. The vertical axis of each of the teeth is aligned with the vertical axis of a particular collimator channel. Thus, the total number of crystal pyramids equals the number of (preferably squared) collimator holes. The space between the crystal pyramids is "filled" with an appropriate light guide material such as window glass. The crystal pyramid side is shaped, i.e. angled, according to the direction of the highest (gamma) photon energy the camera is designed for, after penetrating through the upper (close to crystal) portion of the collimator septum for a length equaling 2.mu..sup.-1 ; where .mu. is the linear absorption coefficient for the (gamma) photon energy in the particular collimator material, such as tantalum (Ta). Thus, the increased crystal thickness is made effective only for photons coming from the "proper" collimator channel, while the absorption of photons from surrounding channels is basically prevented. Theoretical predictions indicate that about 90% of them will take their primary (and secondary) interactions with the light guide and not with the crystal material.
REFERENCES:
patent: 4415808 (1983-11-01), Cusano et al.
patent: 4560882 (1985-12-01), Barbaric et al.
Fields Carolyn E.
Jay Mark H.
Moran John Francis
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