Dental x-ray imaging system

• US 6,404,854 B1
• Filed: 11/13/2000
• Issued: 06/11/2002
• Est. Priority Date: 06/26/2000
• Status: Expired due to Term

• Current Assignee: Blackstone Holdings L.L.C.
• Original Assignee: AFP Imaging Corporation (Biowave Innovations LLC)
• Inventors: Fröjdh, Christer, Carroll, Seamus
• Primary Examiner(s): Kim, Robert H.
• Assistant Examiner(s): Kiknadze, Irakli
• Application Number:
  US09/711,798
• Time in Patent Office: 575 Days
• Field of Search: 378/98.8, 378/98, 250/370.09, 250/370.11, 348/241, 348/250, 348/301
• US Class Current: 378/98.8
• CPC Class Codes: A61B 6/4233 using matrix detectors
• CPC Class Codes: A61B 6/512 Intraoral means
• CPC Class Codes: A61B 6/542 involving control of exposure
• CPC Class Codes: G01T 1/17 Circuit arrangements not adapted to a particular type of detector pulse-selection circuits H03K, G01R
• CPC Class Codes: G01T 1/2928 using solid state detectors
• CPC Class Codes: G01T 7/00 Details of radiation-measuring instruments
• CPC Class Codes: H04N 23/73 by influencing the exposure time
• CPC Class Codes: H04N 5/32 Transforming X-rays cameras or camera modules for generating image signals from X-rays H04N23/30; circuitry of SSIS for transforming X-rays into image signals H04N25/30

Abstract

An X-ray imaging system comprising an X-ray image sensor and an image capture controller is provided. The X-ray image sensor includes a sensor array comprising a plurality of CMOS active column sensors. The image capture controller communicates with the X-ray image sensor to read out pixel values from selected ones of the CMOS active column sensor elements. The image capture controller may randomly select reference pixels from the plurality of CMOS active column sensor elements, and compare a signal of the reference pixels to a predetermined level to determine a start of X-ray exposure. The image capture controller also may randomly select second reference pixels from the plurality of CMOS active column sensor elements, and monitor the second reference pixels to determine an end of X-ray exposure. The X-ray imaging system also may include a wireless interface for coupling the X-ray image sensor to the image capture controller. The X-ray imaging system may be used as a dental X-ray imaging system. An intraoral X-ray image sensor comprising a scintillator that converts an X-ray energy image into a visible-light image and a sensor array including a plurality of CMOS active column sensors which converts the visible-light image into an electrical signal also may be provided.

Claims

1. An X-ray imaging system comprising:

an X-ray image sensor including a plurality of CMOS active column sensor elements; and

an image capture controller which communicates with the X-ray image sensor to read out pixel values from selected ones of the plurality of CMOS active column sensor elements of the X-ray image sensor.

2. The X-ray imaging system of claim 1, wherein the X-ray imaging system is used as a dental X-ray imaging system.

3. The X-ray imaging system of claim 1, wherein the image capture controller randomly selects reference pixels from the plurality of CMOS active column sensor elements, and compares a signal of the reference pixels to a predetermined level to determine a start of X-ray exposure.

4. The X-ray imaging system of claim 3, wherein the image capture controller randomly selects second reference pixels from the plurality of CMOS active column sensor elements, and monitors the second reference pixels to determine an end of X-ray exposure.

5. The X-ray imaging system of claim 1, wherein the X-ray image sensor is an intra-oral sensor.

6. The X-ray imaging system of claim 1 further comprising a wireless interface for coupling the X-ray image sensor to the image capture controller.

7. An intraoral X-ray image sensing system comprising:

a scintillator that converts an X-ray energy image into a visible-light image; and

a sensor array including a plurality of CMOS active column sensors, said sensor array converting the visible-light image an electrical signal.

8. The intraoral X-ray image sensing system of claim 7, further comprising

an image capture controller,

wherein the image capture controller randomly selects reference pixels from the plurality of CMOS active column sensors, controls readout of pixel values from the selected reference pixels, and compares a signal of the reference pixels to a predetermined level to determine a start of X-ray exposure.

9. The intraoral X-ray image sensing system of claim 8, wherein the image capture controller randomly selects second reference pixels from the plurality of CMOS active column sensors, and monitors the second reference pixels to determine an end of X-ray exposure.

10. The intraoral X-ray image sensing system of claim 7, further comprising

an image capture controller,

wherein the scintillator, the sensor array and the image capture controller are integrated in a sensor assembly, and the image capture controller controls readout of pixel values from selected ones of the plurality of CMOS active column sensors.

11. An X-ray imaging system comprising:

an X-ray image sensor including a plurality of sensor elements; and

an image capture controller,

wherein the image capture controller communicates with the X-ray image sensor to read out pixel values from selected ones of the plurality of sensor elements, randomly selects reference pixels from the plurality of sensor elements, and compares a signal of the reference pixels to a predetermined level to determine a start of X-ray exposure.

12. The X-ray imaging system of claim 11, wherein the image capture controller and the X-ray image sensor are integrated in a sensor assembly.

13. The X-ray imaging system of claim 11, wherein the image capture controller randomly selects second reference pixels from the plurality of sensor elements, and monitors the second reference pixels to determine an end of X-ray exposure.

14. The X-ray imaging system of claim 11, further comprising a wireless interface for coupling the X-ray image sensor to the image capture controller.

15. The X-ray imaging system of claim 11, wherein the X-ray imaging system is used as a dental X-ray imaging system.

16. The X-ray imaging system of claim 11, wherein the X-ray image sensor is an intra-oral sensor.