Realtime digital diagnostic image processing system

• US 4,680,628 A
• Filed: 01/04/1984
• Issued: 07/14/1987
• Est. Priority Date: 01/04/1984
• Status: Expired due to Fees

• Current Assignee: ITEQ Corporation
• Original Assignee: ITEQ Corporation
• Inventors: Jones, Richard J., Aufiero, James M., Wojcik, David R.
• Primary Examiner(s): Howell, Janice A.
• Application Number:
  US06/568,013
• Time in Patent Office: 1,287 Days
• Field of Search: 378/99, 378/100, 358/111, 364/414, 128/654
• US Class Current: 378/98.2
• CPC Class Codes: G06T 2207/10121 Fluoroscopy
• CPC Class Codes: G06T 5/92 based on global image properties

Abstract

A fluoroscopic image is processed digitally using a television camera operating at a frame rate of at least 30 frames per second viewing the image and providing an analog video output, a digitizer which digitizes the analog video output to provide digital information representative of the analog signal, a plurality of frame processors which carry out arithmetic and logical operations on the digital image information and are operable at the frame rate of the television camera coupled to the output of the digitizer, a 2-D filter operable at the frame rate of the television camera coupled to said frame processors, a converter and interface to convert digital image information processed in the frame processors and 2-D filter back into an analog signal and television display coupled to the output of the converter for displaying the processed signal.

Claims

1. Apparatus for processing a fluoroscopic image comprising:

a. a television camera operating at a frame rate of at least 30 frames per second providing an analog video output;

b. means to digitize series of individual frames of said analog video output to provide frames of digital image information representative of the analog signal;

c. a plurality of frame processors coupled in series for carrying out arithmetic and logical operations on said frames of digital image information coupled to receive the output of said digitizer;

d. a 2-D digital finite impulse response filter operable on said individual frames of digital image information coupled to said frame processors;

e. means to convert frames of digital image information processed in said frame processors and 2-D filter back into frames of an analog signal; and

f. a television display coupled to the output of said means to convert for displaying said processed signal.

2. Apparatus according rto claim 1, wherein said 2- D digital finite impulse response transversal filter is coupled to receive an input from one of said frame processors and to provide its output to another of said frame processors.

3. Apparatus according to claim 2, wherein said television camera has an interlaced scan and wherein a first frame processor is provided for deinterlacing said interlaced scan to put the scan lines in sequential order and second and third frame processors are provided to reinterlace the digital information after processing and before conversion back into an analog signal.

4. Apparatus according to claim 3, wherein in addition to said first, second and third frame processors three additional frame processors are provided, fourth and fifth frame processors for use in carrying arithmetic and logic operations and a sixth frame processor for use as a display buffer.

15. Apparatus according to claim 1, and further including a wide-band tape recorder having an input and an output and means for coupling said frames of digital image information to the input of said wide-band tape recorder before processing and means for coupling the output of said wide-band tape recorder to said frame processors and 2-D filter whereby unprocessed digitized information may be recorded on said wide-band tape recorder and subsequently played back through said system.

16. Apparatus according to claim 15, wherein said means for coupling includes means to pack and unpack information when being written onto and read from said tape recorder so as to use all channels on said tape recorder.

17. Apparatus according to claim 16 and further including means to insert header information along with each frame of date recorded on sold wide-band tape recorder.

18. Apparatus according to claim 17, and further including a video color display system adapted to provide pseudo-color, gray scale thresholding, gray expansion, and contrast enhancement.

19. Apparatus according to claim 18, wherein said display system includes a cursor and further including a joystick coupled to drive said cursor, asid joystick coupled ot said host computer, said host computer linear and area computations of cursor movement.

20. Apparatus according to claim 1, wherein each of said means to digitize, plurality of frame processors, 2-D filter, and means to convert are operable at the frame rate of said television camera.

21. Apparatus according to claim 20, wherein said frame rate is at least 20 frames per second and each individual frame contains a matrix of at least 512 by 512 pixels, each with a resolution of at least 10 bits. 132

22. Apparatus according to claim 21, and further including a host processor having an interactive terminal, said host processor providing command outputs to said 2-D filter to select said weighting coefficients.

23. Apparatus according to claim 20, wherein said finite inpulse response transversal filter includes an N by N pixel scanning kernal where N is an odd number, such that there will be a pixel element at the center of said kernal surrounded by rings of pixels, said filter acting to cause said kernal to scan a frame of pixels, and to assign as a new value to each pixel a value determined by weighting the center pixel and the pixels in each of the rings of pixels in said kernal surrounding said center pixel, said weighting being determined by weighting coefficients.

26. The method according to claim 20, comprising storing the digitized information before processing on a wide-band tape recorder.

27. The method according to claim 22, and further comprising also storing header information on each frame.

28. The method according to claim 23, wherein said header information includes information identifying the person being examined and information indicating the configuration of the system at the time said data was recorded.

5. Apparatus according to claim 5, wherein each of said frame processors is capable of performing the following arithmetical and logical operations:

add, subtract, exclusive or, negate and image intensity transformation, each frame processor including its own microprocessor controller for controlling which of the functions said frame processor performs.

6. Apparatus according to claim 5, and further including a host processor having an interactive terminal, said host processor providing command inputs to said frame processors to select which function is to be performed.

7. Apparatus according to claim 6, and further including a host processor having an interactive terminal, said host processor providing command inputs to said frame processors to select which function is to be performed.

8. Apparatus according to claim 7, wherein said 2-D digital finite impulse response transversal filter has inputs to select different modes of operation and wherein said host processor is coupled to interactively provide commands to said 2-D filter to select a mode of operation.

9. Apparatus according to claim 8, wherein said interactive terminal associated with said host computer includes keyboard, light pen and voice actuated inputs.

10. Apparatus according to claim 9, wherein said host computer has stored therein a plurality of protocols each corresponding to a predetermined system configuration of said frame processors and 2-D filter, said protocols selectable by an operator through said interactive terminal.

11. Apparatus according to claim 6, and further including a disc drive coupled to said host computer.

12. Apparatus according to claim 11, wherein the output of said 2-D filter is coupled to a display frame processor and wherein said display frame processor is coupled such that its contents may be stored on said disk drive.

13. Apparatus according to claim 8, and further including a tape drive for said host computer.

14. Apparatus according to claim 8, wherein said different modes of operation correspond to different pass bands for said filter.

24. A method of performing a diagnostic procedure on a person comprising:

a. passing a radio opaque medium through a body passage in the person being examined and irradiating the area of the body containing said body passage with X-radiation while doing so;

b. converting said X-radiation to a visible image and viewing said visible image with a television camera having a frame rate of at least 30 frames per second;

c. digitizing the output of said television camera at a frame rate of at least 30 frames per second in real time to obtain individual frames of digitized image information representative of said body passage containing said radio opaque medium;

d. filtering said individual frames of said digitized image information in a 2-D filter; and

e. displaying said filtered image.

25. The method according to claim 24, and further including adding some of the original image back to the filtered image.

29. The method according to claim 24, and further including playing back said data from said wide-band tape recorder and reanalyzing said data with a different system configuration.