Scintillating glass pixelated imager

Patent metadata

Field	Value
Publication number	US-11079499-B2
Application number	US-201916283440-A
Country	US
Kind code	B2
Filing date	Feb 22, 2019
Priority date	Apr 1, 2016
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

In a method of making pixelated scintillators, a block of an amorphous scintillator material is divided into plural sections. The plural sections of the block are rejoined with plural first reflective septa to form an assembly. In the assembly, each of the plural first reflective septa separates two adjacent sections of the block. The assembly is then divided into plural sections in a way such that each of the plural sections of the block is divided into plural pixels. The plural sections of the assembly are rejoined with plural second reflective septa. Each of the plural second reflective septa separates two adjacent sections of the assembly, forming an array comprising plural rows and columns of pixels of the amorphous scintillator material. In the array, each pixel is separated from adjacent pixels by a portion of at least one of the plural first reflective septa and at least one of the second reflective septa.

First claim

What is claimed is:

1. An apparatus, comprising:
a pixelated scintillator layer configured to generate light photons from x-rays having energy at a megavolt level; and
a detector array configured to produce electrical signals from light photons,
wherein the pixelated scintillator layer comprises one or more arrays each comprising plural rows and columns of pixels of an amorphous scintillator material having a thickness configured to interact with x-rays having energy at the megavolt level, wherein each pixel is separated from adjacent pixels by a reflective septum, wherein the pixelated scintillator layer has a pixel pitch, and an aspect ratio of the thickness to the pixel pitch ranging from 1:1 to 50:1.

2. The apparatus of claim 1 , wherein the reflective septum comprises a specular reflector.

3. The apparatus of claim 1 , wherein each of the pixels of the amorphous scintillator material is rectangular or square in cross-section.

4. The apparatus of claim 1 , wherein the pixelated scintillator layer has a pixel pitch ranging from about 0.05 mm to about 40 mm.

5. The apparatus of claim 1 , wherein the pixelated scintillator layer has an aspect ratio ranging from about 1:1 to about 50:1.

6. The apparatus of claim 1 , wherein the detector array comprises a thin film transistor (TFT) flat panel.

7. The apparatus of claim 1 , wherein the pixelated scintillator layer comprises more arrays arranged in a one-dimensional configuration.

8. The apparatus of claim 1 , wherein the pixelated scintillator layer comprises more arrays arranged in a two-dimensional configuration.

9. A system, comprising:
a radiation source operable to produce x-rays having energy at a megavolt level; and
an imaging device operable to acquire images using the x-rays produced by the radiation source, wherein the imaging device comprises:
a pixelated scintillator layer configured to generate light photons from the x-rays produced by the radiation source; and
a detector array producing electrical signals from the light photons,
wherein the pixelated scintillator layer comprises plural rows and columns of pixels of an amorphous scintillator material having a thickness configured to interact with x-rays having energy at the megavolt level, and wherein each of the pixels is separated from adjacent pixels by a reflective septum, and the pixelated scintillator layer has a pixel pitch, and an aspect ratio of the thickness to the pixel pitch ranging from 1:1 to 50:1.

10. The system of claim 9 , wherein the radiation source and the imaging device are operable to conduct cone-beam computed tomography (CBCT).

11. The system of claim 9 , wherein the radiation source is operable to produce x-rays having an energy level ranging from 4 to 25 MV.

12. The system of claim 9 , wherein the reflective septum comprises a specular reflector.

13. The system of claim 12 , wherein the specular reflector comprises aluminized polyethylene terephthalate (PET) or polyester.

14. The system of claim 9 , wherein the pixelated scintillator layer has a pixel pitch ranging from about 0.05 mm to about 40 mm.

15. The system of claim 9 , wherein the pixelated scintillator layer has an aspect ratio ranging from about 1:1 to about 50:1.

Assignees

• Varian Med Sys Inc

Inventors

• Shedlock Daniel
• Star-Lack Josh M
• Wang Adam

Classifications

• G01T1/2002 Primary

  Optical details, e.g. reflecting or diffusing layers · CPC title

• G01T1/20183 Primary

  Arrangements for preventing or correcting crosstalk, e.g. optical or electrical arrangements for correcting crosstalk · CPC title

• G01T1/247

  Detector read-out circuitry (for processing gain or off-set correction H04N) · CPC title

• G01T1/2018 Primary

  Scintillation-photodiode combinations · CPC title