Enhanced digital detector and system and method incorporating same

• US 6,535,576 B2
• Filed: 12/29/2000
• Issued: 03/18/2003
• Est. Priority Date: 12/29/2000
• Status: Expired due to Term

• Current Assignee: GE Medical Systems Global Technology Company LLC (GE Healthcare Technologies, Inc.)
• Original Assignee: GE Medical Systems Global Technology Company LLC (GE Healthcare Technologies, Inc.)
• Inventors: Vafi, Habib, Petrick, Scott W., Perry, Douglas I.
• Primary Examiner(s): Dunn, Drew A.
• Assistant Examiner(s): THOMAS, COURTNEY D
• Application Number:
  US09/752,084
• Publication Number:
  US 20020085670A1
• Time in Patent Office: 809 Days
• Field of Search: 378/98.8, 378/62, 378/207, 250/584, 250/339.02, 250/370.08, 250/370.09, 250/370.11, 250/208.1, 348/294, 348/302, 348/308
• US Class Current: 378/98.8
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: G01T 1/20184 Detector read-out circuitry, e.g. for clearing of traps, compensating for traps or compensating for direct hits
• CPC Class Codes: G01T 1/2928 using solid state detectors

Abstract

A technique is provided for increasing the pixel pitch without increasing the interconnect density of a digital detector. Generally, a digital detector has an array of rows and columns of pixels, read out electronics and scan electronics, that are configured to generate and transmit signals based upon radiation impacting the detector. The detector also having a plurality of scan lines, which are coupled to the plurality of rows of pixels. The present technique also provides a multiplexing circuit for selectively coupling the rows of pixels to the respective scan lines for read out of the signals.

Claims

1. A detector for an imaging system comprising:

an array of pixels forming rows and columns, and configured to generate signals based upon radiation impacting the detector;

a plurality of scan lines, each scan line being adapted to be coupled to a plurality of rows of pixels; and

a multiplexing circuit for selectively coupling the rows of pixels to respective scan lines for read out of the signals.

2. The detector as in claim 1, further comprising a plurality of column readout lines coupled to a plurality of columns of pixels.

3. The detector as in claim 2, wherein each column readout line is coupled to two columns of pixels.

4. The detector as in claim 1, wherein the multiplexing circuit includes a first set of switches for selecting rows of pixels for readout.

5. The detector as in claim 1, wherein the multiplexing circuit includes a second set of switches for selecting columns of pixels for readout.

6. The detector as in claim 1, wherein each scan line is coupled to two rows of pixels.

7. The detector as in claim 1, wherein the detector includes a plurality of column readout lines coupled to the pixels, and wherein the number of pixels is at least two times the sum of the number of scan lines and column readout lines.

8. The detector as in claim 1, further comprising a control circuit to regulate switching of the multiplexer circuit.

9. The detector as in claim 1, wherein each of the pixels includes a thin film transistor and a photodiode.

10. A digital imaging system, comprising:

a source of radiation;

a control circuit to regulate the source of radiation; and

a detector for receiving radiation from the source of radiation and for generating signals therefrom, the detector having an array of pixels forming rows and columns, and a plurality of scan lines, each scan line being adapted to be coupled to a plurality of rows of pixels, and a mulitplexing circuit for selectively coupling the rows of pixels to respective scan lines for read out of the signals.

11. The system as in claim 10, further comprising a plurality of column readout lines coupled to a plurality of column of pixels.

12. The system as in claim 10, wherein each column readout line is coupled to two columns of pixels.

13. The system as in claim 10, wherein the multiplexing circuit includes a first set of switches for selecting rows of pixels for readout.

14. The system as in claim 10, wherein the multiplexing circuit includes a second set of switches for selecting columns of pixels for readout.

15. The system as in claim 10, wherein each scan line is coupled to two rows of pixels.

16. The system as in claim 10, wherein the system includes a plurality of column readout lines coupled to the pixels, and wherein the number of pixels is at least two times the sum of the number of scan lines and column readout lines.

17. The system as in claim 10, further comprising a control circuit to regulate switching of the multiplexer circuit.

18. The system as in claim 10, wherein each of the pixels includes a thin film transistor and a photodiode.

19. The system as in claim 10, wherein the source of radiation is an x-ray source.

20. The system as in claim 10, further comprising data acquisition circuitry for receiving signals generated by the detector and reconstructing useful images based thereon.

21. A method for acquiring signals from discrete pixels in a detector, the detector including a matrix of rows and columns of pixels, each pixel configured to generate a signal based upon radiation received, the method comprising:

commanding a multiplexer circuit to selectively couple desired pixels of the rows and columns of pixels to enabling scan lines;

reading signals from the pixels of the desired rows and columns.

22. The method as recited in claim 21, wherein each of the scan lines is adapted for coupling to a plurality of rows of pixels via the multiplexing circuit.

23. The method as recited in claim 21, wherein the step of commanding a multiplexing circuit includes commanding a first multiplexing circuit for coupling pixels of each scan line to desired columns of pixels for read out.

24. The method as in claim 21, wherein the step of reading the signals from the pixels includes reading signals from one of a plurality of a columns of pixels coupled to a respective column of readout lines.