Magnet room display of MRI and ultrasound images

• US 5,432,544 A
• Filed: 12/21/1992
• Issued: 07/11/1995
• Est. Priority Date: 02/11/1991
• Status: Expired due to Term

• Current Assignee: Resonance Technology Incorporated
• Original Assignee: Susana Ziarati
• Inventors: Ziarati, Mokhtar
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): LEE, MICHAEL
• Application Number:
  US07/997,957
• Time in Patent Office: 932 Days
• Field of Search: 358/93, 358/22, 358/901, 358/108, 358/110, 358/112
• US Class Current: 600/410
• CPC Class Codes: G01R 33/283 Intercom or optical viewing arrangements, structurally associated with NMR apparatus
• CPC Class Codes: H04N 5/44 Receiver circuitry for the reception of television signals according to analogue transmission standards H04N5/14 takes precedence
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

A display system for display of MRI, ultrasonic, patient vital sign or other imagery within a magnet room of an MRI system. An MRI compatible video display is disposed with the magnet room, and is connected to the MRI image processor to provide MRI images to medical personnel working in the magnet room. The display can be an MRI compatible LCD projection display, a wired LCD screen display, a reflective LCD screen display or a plasma display. The display within the magnet room is made MRI compatible by appropriate shielding and filtering. The display may also display patient vital sign data or imagery from an MRI compatible ultrasound apparatus.

Claims

1. A display system compatible with a magnetic resonance imaging (MRI) apparatus disposed in a magnet room, the system comprising:

means for providing MRI image video signals;

an MRI-compatible display means responsive to said video signals and disposed within said magnet room for providing a display within said magnet room, said display means including RF and electromagnetic interference filtering means to prevent noise from said display means from affecting the quality of the images produced by said MRI apparatus.

2. The display system of claim 1 wherein said display means comprises a liquid crystal display (LCD) projector and a non-magnetic display screen located within said magnet room.

3. The display of claim 2 wherein said projector comprises a housing shield for containing the electronic components of said display and shielding against the propagation of RF noise from components within said housing shield to said magnet room.

4. The display of claim 3 wherein said projector comprises an optical lens for focussing light projected by said projector, and further including a metallic waveguide within which said lens is disposed, said waveguide extending from within said projector housing over the extent of said lens and comprising filter means for shielding against propagation of RF energy above about 10 MHz in frequency out said housing through said lens.

5. The display of claim 2 wherein said projector further comprises an ac power cable, said cable being provided with grounded RF shielding.

6. The display of claim 2 wherein said projector comprises a power supply connected to a source of electrical energy, said projector further comprising an electromagnetic filter connected between said source and said power supply.

7. The display of claim 1 wherein said display is further responsive to an alternate source of video image signals illustrative of an alternate image type, and said display further includes a means for selecting whether the display means is displaying said MRI images or said alternate image.

8. The display of claim 7 wherein said selecting means comprises a switch.

9. The display of claim 7 wherein said alternate source of video image signals is apparatus for providing patient vital sign data.

10. The display of claim 9 wherein said patient vital sign apparatus comprises EKG apparatus.

11. The display of claim 9 wherein said patient vital sign apparatus comprises apparatus for monitoring patient breathing signs.

12. The display of claim 7 wherein said alternate source of video image signals comprises MRI compatible ultrasonic imaging apparatus located within said magnet room.

13. The display of claim 1 wherein said display means comprises an LCD screen display device.

14. The display of claim 13 wherein said screen display device comprises a wired LCD screen.

15. The display of claim 13 wherein said screen display device includes a fluorescent light source powered by a high voltage power supply.

16. The display of claim 14 wherein said screen display device further includes a display housing shield and a high voltage power supply means located physically outside said shield but within said magnet room in a location where there is no strong magnetic field.

17. The display of claim 16 further comprising RF shielded cabling connecting said housing shield and said power supply means.

18. The display of claim 13 wherein said LCD screen display comprises LCD driver circuitry, and RF shielding means enclosing said driver circuitry for preventing unwanted propagation of RF noise into said magnet room.

33. The display of claim 3 wherein said display means comprises a wired LCD screen display.

35. The display of claim 3 wherein said display means comprises a reflective LCD display means.

19. An image display system compatible with a magnetic resonance imaging (MRI) apparatus disposed in a control room and a magnet room separated by a penetration panel, wherein the magnet room contains a main magnet having a bore, the system comprising:

means for providing MRI image video signals, located within said control room;

an MRI-compatible display means disposed within said magnet room for providing a display within said magnet room, said display means including RF and electromagnetic interference filtering means to prevent noise from said display means from affecting the quality of the images produced by said MRI apparatus; and

means for conducting said image video signals through said penetration panel to said MRI-compatible display means located within said magnet room, said means including means for filtering said image display video signals for RF and high frequency energy.

20. The display system of claim 19 wherein said display means comprises a liquid crystal display (LCD) projector and a non-magnetic display screen located within said magnet room.

21. The display of claim 20 wherein said projector comprises a housing shield for containing the electronic components of said display.

22. The display of claim 20 wherein said projector comprises an ac power cable passed through said penetration panel to a source of ac power, a power supply operating on ac power, and an electromagnetic interference filter for coupling said ac power to said power supply, said filter for preventing electromagnetic noise energy from passing from said projector outwardly into said magnet room and thereby affecting said image quality.

23. A display system compatible with a magnetic resonance imaging (MRI) apparatus disposed in a magnet room, the system comprising:

means for providing data signals representative of a vital sign of a patient located within said magnet room;

an MRI-compatible display means responsive to said data signals and disposed within said magnet room for providing a visual display within said magnet room illustrative of said patient vital sign, said display means including RF and electromagnetic interference filtering means to prevent noise from said display means from adversely affecting the quality of images produced by said MRI apparatus.

24. The system of claim 23 wherein said means for providing data signals comprises an electrocardiogram sensing means.

25. The system of claim 23 wherein said means for providing data signals comprises means for providing patient breathing data.

26. The system of claim 23 wherein said means for providing data signals comprises peripheral gating means coupled to the patient.

27. The system of claim 23 wherein said display means comprises LCD projection means.

28. The system of claim 23 wherein said display comprises a plasma display apparatus.

29. The system of claim 23 wherein said display comprises a wired LCD display system.

30. The system of claim 23 wherein said display comprises a reflective LCD display system.

31. A display system compatible with a magnetic resonance imaging (MRI) apparatus disposed in a magnet room, the system comprising:

an MRI compatible ultrasonic imaging system disposed within said magnet room for providing ultrasonic image signals of a patient within said magnet room;

an MRI-compatible display means responsive to said ultrasonic image signals and disposed within said magnet room for providing an ultrasonic image display within said magnet room, said display means including RF and electromagnetic interference filtering means to prevent noise from said display means from affecting the quality of the images produced by said MRI apparatus.

32. The display of claim 31 wherein said display means comprises an LCD projector for projecting images onto a non-magnetic screen disposed within said room.

34. The display of claim 31 wherein said display means comprises a plasma display means.