Intraoral imaging system

• US 6,149,300 A
• Filed: 10/16/1998
• Issued: 11/21/2000
• Est. Priority Date: 10/17/1997
• Status: Expired due to Fees

• Current Assignee: Varian Medical Systems Incorporated (Siemens AG)
• Original Assignee: Welch Allyn Incorporated
• Inventors: Beardslee, Andrew W., Stone, Michael C., Vogelsong, Thomas L., Greenway, Wiliam C., Breithaupt, David W., Bitler, William
• Primary Examiner(s): Church, Craig E.
• Application Number:
  US09/173,501
• Time in Patent Office: 767 Days
• Field of Search: 378/191, 378/63, 378/98.5
• US Class Current: 378/191
• CPC Class Codes: A61B 1/042 characterised by a proximal camera, e.g. a CCD camera
• CPC Class Codes: A61B 1/24 for the mouth, i.e. stomatoscopes, e.g. with tongue depressors tongue depressors per se A61B13/00; Instruments for opening or keeping open the mouth combined with saliva removers A61C17/00; mouth openers for animals A61D15/00
• CPC Class Codes: A61B 6/4233 using matrix detectors
• CPC Class Codes: A61B 6/4411 the apparatus being modular A61B6/4283 takes precedence
• CPC Class Codes: A61B 6/512 Intraoral means
• CPC Class Codes: A61B 6/5247 combining images from an ionising-radiation diagnostic technique and a non-ionising radiation diagnostic technique, e.g. X-ray and ultrasound
• CPC Class Codes: G01N 23/04 and forming images of the material

Abstract

An intraoral dental imaging system employs a service unit having a power supply and a light source, and selectively using a video camera having a plug-in module for releasably connecting the video camera to the power supply, or an x-ray camera having a second plug-in module for releasably connecting the x-ray camera to the power supply. In either case the modules have processing means for producing video output signals. These video output signals may be sent to a wide variety of devices connected to the service unit. For instance, they may be used to display an image on a video monitor, such as a CRT, they may be sent to a printer for printing, and they may be sent to a modem for eventual display at another location. In essence, these video output signals may be sent to any device known in the art. Thus, the plug-in modules are highly portable while allowing for interchangeability within the same service unit, thereby allowing a practitioner to use the modules in multiple operatories. In the intraoral x-ray camera the plug-in module may be connected to a sensing head by an umbilical cord. The sensing head includes a first means for converting x-ray input signals into electrical output signals and forwarding those signals to a video processor within the plug-in module, an x-ray sensor means for detecting x-rays, and a triggering means for triggering x-ray acquisition from a sensor, which enables the first means when x-rays are detected and disabling the first means when x-rays are not detected by the sensor means.

Claims

1. An intraoral dental imaging system, comprising:

a processor unit having a power supply, a light source, and video output circuitry;

a video camera having a first plug-in module for releasably connecting the video camera to said processor unit, said first plug-in module connected to a probe containing a miniature video camera by a first umbilical cord;

an x-ray camera assembly having a second plug-in module for releasably connecting the x-ray camera assembly to said processor unit, said second plug-in module connected to a second probe containing an x-ray camera by a second umbilical cord,

each of said first and second plug-in modules having processing means for producing video output signals.

2. The intraoral dental imaging system of claim 1, wherein said video camera assembly and said x-ray camera each include:

a solid state imager mounted within said probe, said solid state imager having means for receiving an image and transforming said image into an analog signal; and

a hybrid circuit mounted adjacent to said solid state imager, said hybrid circuit transmitting and receiving signals between a respective plug-in module and said solid state imager, said solid state imager producing an analog output signal which is sent to a video processor of said hybrid circuit.

3. The intraoral dental imaging system of claim 2, further including:

a signal processing circuit within each of said first and second plug-in modules for receiving and processing said analog signal; and

a camera board within each module for receiving an output signal from said signal processing circuit.

4. The intraoral dental imaging system of claim 3, including a video display connected to said processing unit wherein said video camera board receives said analog signal from said signal processing board, said video camera board including:

a double correlated sampling chip for sampling said analog signal;

an A-D converter for converting said analog signal into digital video data; and

a digital signal processor for providing both an S video signal and a composite signal to a chip on said camera board which buffers said signals, wherein said signals are then output to said video display.

5. The intraoral dental imaging system of claim 1, further comprising video output means for relaying said video output signals from said processor unit to a video peripheral device.

6. The intraoral dental imaging system of claim 2, wherein a recording surface of said solid state imager of said x-ray camera is covered with a scintillating material for detecting light.

7. The intraoral dental imaging system of claim 6, wherein said solid state imaging device is a charge injected device, said charge injected device transforming said image on its surface into an analog signal which is received and buffered by said hybrid circuit.

8. The intraoral dental camera of claim 2, wherein said images from each of said video camera assembly and said X-ray camera assembly are received in real time when a said assembly is selectively connected to said processor unit.

9. The intraoral dental imaging system of claim 2, wherein said first umbilical cord includes a fiber bundle for carrying light from the processor unit to said probe, said fiber bundle including light transmitting ends for illuminating a target region.

10. The intraoral dental imaging system of claim 2, wherein said video camera assembly includes lenses for focusing said target image onto a sensor surface of the imager.

11. The intraoral dental imaging system of claim 10, wherein said solid state imaging device is a charge couple device, said charge coupled device transforming said image on its surface into an analog signal which is received and buffered by said hybrid circuit.

12. The dental imaging system of claim 1, wherein said x-ray module includes:

a converting means in the probe for converting x-ray input signals into electrical output signals and forwarding said electrical output signals to a processor mounted in the module;

an x-ray sensor means in the probe for detecting x-rays; and

a triggering means for triggering x-ray acquisition, said triggering means associated with said x-ray sensor means for enabling said converting means when x-rays are detected and disabling said converting means when x-rays are not detected by said sensor means.

13. The intraoral x-ray camera of claim 12, wherein said x-ray sensor means comprises a plurality of sensors arranged about the periphery of said probe to pick up said x-ray.

14. The intraoral x-ray camera of claim 13, wherein each of said x-rays sensors is a photo diode for detecting the presence of an x-ray and outputting an electrical signal which is applied to a comparator, said comparator outputting a trigger signal to a retriggerable device when a preset threshold voltage is exceeded.

15. The intraoral x-ray camera of claim 14, wherein said comparator generates a continuous low value output signal during the time of the x-ray, and said comparator generates a high value output signal when the x-ray is terminated, thereby controlling the output of said retriggerable device to produce an x-ray image.

16. The intraoral x-ray camera of claim 15, wherein said comparator, upon exceeding a predetermined time interval between output pulses, generates an out signal commencing read out of pixels received from a solid-state imager.

17. An intraoral dental imaging system, comprising:

a processor unit having a power supply, a light source, and video output circuitry;

a video camera assembly having a first plug-in module for releasably connecting the video camera assembly to said processor unit, said first plug-in module connected to a probe containing a miniature video camera by a first umbilical cord;

an x-ray camera assembly having a second plug-in module for releasably connecting the x-ray camera assembly to said power supply, said x-ray camera assembly including a sensing head connected to a second umbilical cord to a second plug-in module, said second plug-in module being received within said processor unit, converting means in the sensing head for converting x-ray input signals into electrical output signals and forwarding said electrical output signals to a video processor mounted in the second plug-in module, an x-ray sensor means in the sensing head for detecting x-rays, and a triggering means for triggering x-ray acquisition from a sensor, said triggering means associated with said sensor means for enabling said converting means when x-rays are detected and disabling said converting means when x-rays are not detected by said sensor means; and

each of said first and second plug-in modules having processing means for producing video output signals.

18. The intraoral x-ray camera of claim 17, wherein said x-ray sensor means comprises a plurality of sensors arranged about the periphery of said sensing head.

19. The intraoral x-ray camera of claim 18, wherein each of said sensors of said X-ray sensor means is a photo diode for detecting the presence of an x-ray and outputting an electrical signal which is applied to a comparator, said comparator outputting a trigger signal to a retriggerable device when a preset threshold voltage is exceeded.

20. The intraoral x-ray camera of claim 19, wherein said comparator generates a continuous low value output signal during the time of the x-ray, and said comparator generates a high value output signal when the x-ray is terminated, thereby controlling the output of said retriggerable device to produce a video picture of the x-ray image.

21. The intraoral x-ray camera of claim 19, wherein said comparator, upon exceeding a predetermined time interval between output pulses, generates an out signal commencing read out of pixels received from an imager.

22. A method for using an intraoral dental imaging system, said system including a processor unit having contained therein a power supply, a light source, and processing circuitry, said system further including a video camera module and an x-ray video module, said method including the steps of:

operably attaching one of said x-ray module and said video camera module to said processor unit;

acquiring one of x-ray images and video images using said attached module; and

removing said module from said processor unit; and

operably attaching the other of said x-ray module and said video module to said processor unit to acquire corresponding images.

23. The method of claim 22 wherein each of said x-ray module and said video camera module are releasably connectable to said processor unit.

24. The method of claim 22, including the step of processing either of said video images and said x-ray images using the processing circuitry contained in said processor unit.

25. The method of claim 22, including the step of triggering x-ray acquisition using said x-ray module when the presence of x-rays from a source are detected.

26. The method of claim 25, wherein said triggering step includes the step of detecting the presence of an x-ray and outputting an electrical signal to enable acquisition by said x-ray module.

27. The method of claim 24, including the step of displaying one of processed x-ray image and video images on a display substantially in real time.