CT detector array having non pixelated scintillator array
View Patent ↗The present invention is a directed to a non-pixelated scintillator array for a CT detector as well as an apparatus and method of manufacturing same. The scintillator array is comprised of a number of ceramic fibers or single crystal fibers that are aligned in parallel with respect to one another. As a result, the pack has very high dose efficiency. Furthermore, each fiber is designed to direct light out to a photodiode with very low scattering loss. The fiber size (cross-sectional diameter) may be controlled such that smaller fibers may be fabricated for higher resolution applications. Moreover, because the fiber size can be controlled to be consistent throughout the scintillator may and the fibers are aligned in parallel with one another, the scintillator array, as a whole, also is uniform. Therefore, precise alignment with the photodiode array or the collimator assembly is not necessary.
1. A CT detector comprising an array of scintillation elements configured to illuminate upon the reception of high frequency electromagnetic energy and coupled to a single light detection element configured to detect illumination of the array of scintillation elements and output electrical signals generally indicative of high frequency electromagnetic energy received by the array of scintillation elements, the detector formed by:
developing a plurality of single crystal fibers of scintillation material;
casting the plurality of single crystal fibers with an adhesive material;
curing the plurality of single crystal fibers and adhesive material to form a cured pack of a first dimension;
cutting the cured pack to a specified dimension that is different from the first dimension;
optically coupling the cured pack to the single light detection element; and
wherein each of the plurality of crystal fibers has a uniform cross-sectional diameter.
2. The CT detector of claim 1 wherein the step of developing further includes the step of growing the plurality of single crystal fibers from a mixture of Tb 4 O 7 , Lu 2 O 3 , Al 2 O 3 and CeO 2 .
3. The CT detector of claim 2 wherein the step of growing includes the step of incorporating one of distilled water and alcohol into the mixture and allowing the mixture to dry and further formed by melting and homogenizing the dried mixture.
4. The CT detector of claim 3 further formed by pulling crystal fibers from the homogenized mixture.
5. The CT detector of claim 1 further formed by coating a layer of reflective material to one end surface of the cured pack.
6. The CT detector of claim 1 further formed by sputter coating reflective metal on one end surface of the cured pack.
7. The CT detector of claim 6 wherein the reflective material includes one of Al, Ag, and Au.
8. The CT detector of claim 1 further formed by depositing adhesive material in any voids existing between adjacent crystal fibers.
9. The CT detector of claim 8 wherein the adhesive material is doped with TiO 2 .