Digital dental system and method

• US 4,409,616 A
• Filed: 03/20/1981
• Issued: 10/11/1983
• Est. Priority Date: 03/20/1981
• Status: Expired due to Fees

• Current Assignee: Georgetown University
• Original Assignee: Georgetown University
• Inventors: Ledley, Robert S.
• Primary Examiner(s): Ng, Jin F.
• Assistant Examiner(s): Coles, Edward L.
• Application Number:
  US06/245,997
• Time in Patent Office: 935 Days
• Field of Search: 358/93, 358/83, 358/111, 358/112, 358/113, 358/106, 378/98, 378/99, 378/100, 378/176, 378/29, 378/38, 378/40, 378/62, 378/63, 378/165, 378/166
• US Class Current: 378/98.2
• CPC Class Codes: A61B 6/512 Intraoral means
• CPC Class Codes: G09B 23/283 for dentistry or oral hygiene G09B23/286 takes precedence
• CPC Class Codes: G09B 5/02 with visual presentation of the material to be studied, e.g. using film strip
• CPC Class Codes: H04N 5/3205 using subtraction imaging techniques

Abstract

A digital dental system and method for real time display of a patient'"'"'s dental image to detect changes with respect to at least one previous dental image of the patient. The system comprises an imaging unit for obtaining a real time dental image from the patient, a converter for converting the real time dental image to digital form, an input device for inputting further digital signals corresponding to at least one previous dental image of the patient, a processor for processing the digital signals and the further digital signals to develop corresponding display signals and further display signals, and a display unit and at least one further display unit for simultaneously and in real time displaying the dental image and the at least one previous dental image, respectively, of the patient. A preferred embodiment of the invention involves whole picture processing of the present and previous dental images to determine changes or differences therebetween. Further features of the present invention include the provision of an alignment motion controller for aligning an image intensifier and an X-ray tube (forming the imaging unit), as well as the provision of a capability for selective display, on one of the display units, of either the current X-ray image or a previously obtained (and stored) X-ray image.

Claims

1. A digital dental system for real time display of a patient'"'"'s dental image to detect changes with respect to at least one previous dental image of the patient, comprising:

imaging means for obtaining a dental image from the patient in real time and providing said dental image as electrical signals;

converting means for converting said electrical signals to digital signals;

input means for inputting further digital signals corresponding to said at least one previous dental image of the patient;

processing means for processing said digital signals and said further digital signals to develop corresponding display signals and further display signals; and

3. The system of claim 1, wherein said imaging means comprises:

an X-ray tube for generating X-rays which are directed toward the teeth of the patient;

an image intensifier for detecting said X-rays which pass through the teeth of the patient; and

a television camera which scans the image intensifier to obtain the dental image from the patient in real time, whereby to provide the dental image as electrical signals.

5. The system of claim 1, wherein said input means comprises a disk unit.

6. The system of claim 1, wherein said at least one further display unit comprises one display unit.

7. The system of claim 1, wherein said at least one further display unit comprises two display units.

8. The system of claim 1, further comprising means connecting each of said plurality of memories to a corresponding one of said display unit and said at least one further display unit so as to provide said digital signals and said further digital signals for display on said plurality of display units, respectively.

9. The system of claim 7, further comprising additional converting means connected to said converting means for reconverting said digital signals to analog form, said connecting means comprising further converters, one for each of said plurality of memories, for converting said digital signals from said plurality of memories to analog form, and a switch connecting said additional converting means and a given one of said further converters, on the one hand, to said display unit, on the other hand, so as to selectively provide either a current dental image of the patient or a previously stored dental image of the patient to said display unit for display.

2. display means comprising a display unit and at least one further display unit responsive to said display signals and said further display signals, respectively, for simultaneously and in real time displaying said dental image and said at least one previous dental image, respectively of said patient wherein said processing means comprises a plurality of memories, one for each said display unit and said at least one further display unit, and a video crossbar switch connecting said converting means to said plurality of memories, said plurality of memories storing said digital signals and said further digital signals, respectively, said processing means further comprises a video processor connected to said video crossbar switch, said video crossbar switch being actuable for routing digital signals from said plurality of memories to said video processor, said video processor operating to whole picture process said digital signals to determine changes in the patient'"'"'s dental image with respect to the at least one previous dental image of the patient.

4. The system of claim 2, further comprising alignment means connected to said image intensifier and responsive to operator input for moving said image intensifier relative to said X-ray tube so as to maintain alignment therebetween.