Method for providing RF shielding for a nuclear magnetic resonance apparatus

• US 7,486,982 B2
• Filed: 04/19/2004
• Issued: 02/03/2009
• Est. Priority Date: 11/02/2001
• Status: Expired due to Fees

• Current Assignee: Advanced Veterinary Technologies Incorporated
• Original Assignee: Advanced Veterinary Technologies Incorporated
• Inventors: Branch, Craig A., Helpern, Joseph A.
• Primary Examiner(s): Smith; Ruth S
• Assistant Examiner(s): LAMPRECHT, JOEL
• Application Number:
  US10/826,297
• Publication Number:
  US 20040194989A1
• Time in Patent Office: 1,751 Days
• Field of Search: 600/410, 600/407, 600/427, 600/415, 600/421, 600/422, 324/627, 324/307, 324/309, 324/318, 324/322, 361/816
• US Class Current: 600/410
• CPC Class Codes: G01R 33/422 of the radio frequency field

Abstract

An apparatus and method for providing RF shielding for performing nuclear magnetic resonance (“NMR”) procedures, comprising a radio-opaque holder in combination with radio-opaque magnet components to form an RF shield around a patient undergoing an NMR procedure. In embodiments, a radio-opaque holder having a radio-opaque bottom portion and a radio-opaque canopy is adjoined to an NMR magnet having a radio-opaque cryostat and a radio-opaque service end cap to form an RF shield. A patient is placed on a patient support unit located in the holder bottom portion. The patient support unit, including the patient, is then inserted into the cavity of the NMR magnet and a canopy is placed on top of the bottom portion of the holder. An RF shield is thus created comprising the canopy, the bottom portion, the cryostat of the magnet, and an end cap on the service end of the magnet.

Claims

1. A method of providing RF shielding for a nuclear magnetic resonance (NMR) apparatus comprising a substantially cylindrical NMR magnet configured for an NMR procedure, comprising:

placing a patient on a radio-opaque holder having a rigid surface defining an opening at a magnet end that substantially matches an opening defined by a patient-end surface of the NMR magnet;

adjoining the rigid surface of the holder to the patient-end surface of the NMR magnet so that the rigid surface abuts against the patient-end surface and electrically couples to a radio-opaque portion of a cryostat of the NMR magnet, the NMR magnet comprising a service end adjoined to a radio-opaque covering that is electrically coupled to the cryostat, thereby forming

a substantially complete and substantially continuous RF shield operative to prevent RF signals from interfering with an NMR procedure conducted using the NMR magnet.

2. The method of claim 1, further comprising placing the covering over the service end of the magnet.

3. The method of claim 2, wherein the placing the patient on the holder comprises placing the patient on a holder comprising a canopy attaced to the bottom portion of the holder.

4. The method of claim 1, wherein the placing the patient on the holder comprises placing the patient on a holder comprising a bottom portion comprising RF shielding.

5. The method of claim 1, wherein the placing the patient on the holder comprises placing the patient on a holder comprising a canopy comprising RF shielding.

6. The method of claim 1, wherein the placing the patient on the holder comprises placing the patient on a holder comprising a patient end cap comprising RF shielding.

7. The method of claim 1, wherein the patient end cap wherein the placing the patient on the holder comprises placing the patient on a holder comprising a patient end cap removably attached to or integral to the bottom portion of the holder.

8. The method of claim 1, wherein the patient end cap wherein the placing the patient on the holder comprises placing the patient on a holder comprising a patient end cap comprising apertures.

9. The method of claim 1, wherein the placing the patient on the holder comprises placing the patient on a holder comprising a bottom portion comprising apertures.

10. The method of claim 1, wherein forming the substantially complete and continuous RF shield comprises combining an RF shield liner with the service end cap and the holder.

11. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a means, attached to the holder, for positioning the holder.

12. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a means, attached to the holder, for positioning the holder, wherein the means for positioning the holder comprises a support configured to support the holder and a means for locomotion.

13. The method of claim 12, wherein the means for locomotion comprises wheels. wheels.

14. The method of claim 12, wherein the means for locomotion rollers.

15. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a patient support unit.

16. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a patient support unit comprising an RF transmitter antenna and an RF receiver antenna.

17. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a patient support unit comprising an RF coil.

18. The method of claim 1, wherein placing the patient on the holder comprises placing an animal on the holder.

19. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a patient support unit comprising a support configured to hold an animal.

20. The method of claim 1, wherein placing the patient on the holder comprises placing a human on the holder.

21. The apparatus of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a patient support unit comprising a support configured to hold a human.

22. The method of claim 1, wherein placing the patent on the holder comprises placing an animal on a holder comprising a support adapted to hold the animal in an inverted position.

23. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a support having a cross section configured substantially to match the curvature of an animal'"'"'s Spine.

24. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a support having a substantially U-shaped cross section.

25. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder comprising a support having a substantially V-shaped cross section.

26. The method of claim 1, wherein placing the patient on the holder comprises placing an animal on a holder comprising a patient support unit comprising straps for holding the animal.

27. The method of claim 1, wherein placing the patient on the holder comprises plaing an animal on a holder configured to hold and support the body of the animal.

28. The method of claim 1, wherein placing the patient on the holder comprises placing the patient on a holder movable into and out of the cavity of the magnet.