CT array with improved photosensor linearity and reduced crosstalk
US5430298A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1994 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Jun 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/195
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A computed tomography (CT) imager includes a scintillator and a photosensor array optically coupled to the scintillator through an optical coupling layer. The photosensor array includes a plurality of photosensitive devices disposed in a block so as to receive incident light from the scintillator through a first surface of the block; each photosensitive device forms a pixel in the array, and each pixel further has a fully photoactive region in which the quantum efficiency of the photosensor is greater than about 65%. The optical coupling layer further includes a pixel boundary light barrier that is made of light absorptive material disposed in the optical coupling layer overlying the areas on the photosensor array first surface between respective fully photoactive regions of the photosensitive devices. The pixel boundary light barrier is disposed to absorb substantially all light photons passing along a path between the scintillator and pixels in the photosensor array other than the pixel underlying the portion of the scintillator in which the light photons were generated, thereby reducing noise and cross-talk in the array and enhancing the linear operating characteristics of photo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.