High-field open MRI magnet isolation system and method

• US 6,774,633 B2
• Filed: 03/19/2003
• Issued: 08/10/2004
• Est. Priority Date: 09/13/2001
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Ranze, Richard Andrew, Wang, Yu, Laskaris, Evangelos Trifon
• Primary Examiner(s): Barrera, Ramon M.
• Application Number:
  US10/390,896
• Publication Number:
  US 20030179060A1
• Time in Patent Office: 510 Days
• Field of Search: 335/216, 335/296-306, 324/318-320
• US Class Current: 324/318
• CPC Class Codes: G01R 33/3802 Manufacture or installation of magnet assemblies; Additional hardware for transportation or installation of the magnet assembly or for providing mechanical support to components of the magnet assembly
• CPC Class Codes: G01R 33/3806 Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets
• CPC Class Codes: G01R 33/389 Field stabilisation , e.g. by field measurements and control means or indirectly by current stabilisation

Abstract

A vertically-aligned open MRI magnet system includes first and second (i.e., top and bottom) assemblies each having a longitudinally-extending and vertically-aligned axis, a superconductive main coil, and a vacuum enclosure enclosing the main coil. At least one support beam has a first end attached to the first assembly and has a second end attached to the second assembly. A vibration isolation system supports the magnet system.

Claims

1. The method of installing an open MRI system, comprising:

providing the open MRI system which comprises a vibration isolation system and an open magnet system;

measuring environmental disturbances and vibrations at a first site;

selecting the vibration isolation system based on the measuring step; and

installing the MRI system at the first site.

2. The method of claim 1, wherein the step of selecting comprises:

selecting a high damping isolation system when significant low frequency vibrations or disturbance are measured at the first site;

or

selecting a low damping isolation system when only high frequency disturbances or vibrations are measured at the first site.

3. The method of claim 2, further comprising adjusting a balance mass to optimize a center of gravity of the magnet system.

4. The method of claim 3, wherein the step of adjusting is performed before or after the step of installing.

5. The method of claim 1, wherein the step of measuring is performed before the step of installing.

6. The method of claim 1, wherein the steps of measuring and selecting are performed before the step of installing.

7. The method of claim 1, further comprising adjusting the damping of the vibration isolation system to minimize the magnet system Q factor and control a bandwidth of a vibrational response at predominant exciting frequencies.

8. The method of claim 1, wherein the vibration isolation system comprises a plurality of pneumatic isolators.

9. The method of claim 1, wherein the vibration isolation system comprises a plurality of active vibration control isolators.

10. The method of claim 1, wherein the step of installing comprises securing the vibration isolation system to a floor, such that the MRI magnet system is provided over the vibration isolation system.

11. The method of claim 1, further comprising:

detaching the MRI system from a floor; and

retrofitting the vibration isolation system to the magnet system of the MRI system prior to the step of installing the MRI system at the first site.

12. A method of retrofitting a preexisting open MRI system comprising attaching a vibration isolation system to a magnet system of the preexisting MRI system.

13. The method of claim 12, further comprising detaching the magnet system from a floor prior to the step of attaching the a vibration isolation system.

14. The method of claim 12, wherein the vibration isolation system comprises a plurality of pneumatic isolators.

15. The method of claim 12, wherein the vibration isolation system comprises a plurality of active vibration control isolators.

16. The method of claim 12, further comprising securing a plurality of posts to a floor and securing the vibration isolation system to the posts, such that the MRI magnet system is provided over the vibration isolation system and such that supports of the preexisting MRI system do not contact the floor.