Radio frequency coil for resonance imaging analysis of pediatric patients

• US 6,992,486 B2
• Filed: 11/26/2003
• Issued: 01/31/2006
• Est. Priority Date: 05/16/2002
• Status: Active Grant

• Current Assignee: Advanced Imaging Research, Inc.
• Original Assignee: Advanced Imaging Research, Inc.
• Inventors: Srinivasan, Ravi
• Primary Examiner(s): Shrivastav, Brij B.
• Application Number:
  US10/722,760
• Publication Number:
  US 20040075437A1
• Time in Patent Office: 797 Days
• Field of Search: 324/318, 324/319, 324/322, 324/309, 324/307, 324/300, 128/653, 600/407
• US Class Current: 324/318
• CPC Class Codes: G01R 33/34046 Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils

Abstract

A radio frequency (RF) pediatric coil for magnetic resonance/imaging analysis is disclosed. The coil includes a first end ring having a generally annular opening, and at least one of a second end ring and an end cap. An anterior extension is formed on the first end ring and on the at least one of the second end ring and the end cap. A plurality of elongated segments are coupled to and positioned circumferentially around the first end ring and the at least one of the second end ring and the end cap to form a coil volume. A first elongated segment and a second elongated segment are spaced about the anterior extension to facilitate access into the coil volume. The coil can be implemented as a standalone coil, or it can be operatively coupled to an incubator to increase the resolution of magnetic resonance scans of a neonate inside the incubator.

Claims

1. A radio frequency (RF) pediatric coil for magnetic resonance/imaging analysis, comprising:

a first end ring having a generally annular opening;

at least one of a second end ring or an end cap; and

a plurality of elongated segments coupled to and positioned circumferentially around the generally annular opening of the first end ring and the at least one of the second end ring or the end cap to form a coil volume, wherein the generally annular opening has a general radius R about which the plurality of elongated segments are positioned, and includes an anterior extension extending radially beyond the general radius R to facilitate access into the coil volume.

2. The coil of claim 1, further comprising an opening in the anterior extension.

3. The coil of claim 2, wherein the opening in the anterior extension is a rectangular opening.

4. The coil of claim 1, wherein a first elongated segment and a second elongated segment of the plurality of elongated segments are spaced about the anterior extension to facilitate access into the col volume.

5. The coil of claim 4, wherein the first elongated segment and the second elongated segment are spaced apart azimuthally at an angle greater than an azimuthal spacing of the remainder of the plurality of elongated segments.

6. The coil of claim 5, wherein the first elongated segment and the second elongated segment are spaced apart azimuthally by about 45 degrees.

7. The coil of claim 6, wherein the remainder of the plurality of elongated segments are spaced apart azimuthally by about 30 degrees.

8. The coil of claim 1, wherein the coil volume is selected to include at least one of a body size and a head size of a 95th percentile of newborn neonates up to three months in age.

9. The coil of claim 1, further comprising:

a platform for restraining neonates, wherein the coil is operatively coupled to the platform to facilitate imaging of the neonates.

10. The coil of claim 1, wherein the anterior extension facilitates placement of at least one life sustaining line.

11. The coil of claim 1, wherein the coil can operate substantially unaffected in hostile environments.

12. The coil of claim 11, wherein the hostile environments include the group consisting of high temperature environment, high humidity environment and high oxygen content environment.

13. The coil of claim 1, wherein the coil is a stand alone coil.

14. The coil of claim 13, wherein the coil is a body coil.

15. The coil of claim 14, wherein the coil is configured in a high pass configuration.

16. The coil of claim 14, wherein the coil is configured in a low pass configuration.

17. The coil of claim 13, wherein the coil is a head coil.

18. The coil of claim 17, wherein the coil is configured in a high pass configuration.

19. The coil of claim 17, wherein the coil is configured in a low pass configuration.

20. The coil of claim 1, wherein the coil is operatively coupled to an incubator.

21. The coil of claim 20, wherein the coil is mounted inside the incubator.

22. The coil of claim 20, wherein the coil is a body coil.

23. The coil of claim 22, wherein the coil is configured in a high pass configuration.

24. The coil of claim 22, wherein the coil is configured in a low pass configuration.

25. The coil of claim 20, wherein the coil is a head coil.

26. The coil of claim 25, wherein the coil is configured in a high pass configuration.

27. The coil of claim 25, wherein the coil is configured in a low pass configuration.

28. The coil of claim 1, further comprising an active decoupling circuit to decouple a receive portion of the coil during a transmit.

29. The coil of claim 28, wherein the active decoupling circuit is operatively coupled to each of the plurality of elongated segments.

30. The coil of claim 28, wherein the active decoupling circuit opens each loop of the coil during the body transmit.

31. An imaging system for magnetic resonance imaging/analysis of a neonate, comprising:

an incubator;

a platform for restraining the neonate, said platform residing within the incubator; and

the coil of claim 1, wherein the coil is operatively coupled to the platform to facilitate positioning of the coil relative to the neonate.

32. A head coil, comprising:

an end cap;

an end ring;

a plurality of legs connecting the end cap to the end ring, wherein the plurality of legs are spaced apart azimuthally by 45 degrees; and

a plurality of drive points, wherein the drive points are bridged using a push-pull configuration.

33. The head coil of claim 32, further comprising:

a plurality of outputs, wherein the outputs are combined with a 3 dB quadrature hybrid converter.

34. The head coil of claim 32, where an anterior portion of the end ring includes an access way to allow placement of human diagnostic connections.

35. A radio frequency (RF) pediatric coil for magnetic resonance/imaging analysis, comprising:

a first end ring having a generally annular opening;

at least one of a second end ring or an end cap; and

a plurality of elongated segments coupled to and positioned circumferentially around the generally annular opening of the first end ring and the at least one of the second end ring or the end cap to form a coil volume, wherein a first elongated segment and a second elongated segment of the plurality of elongated segments are spaced apart azimuthally at an angle greater than an azimuthal spacing of the remainder of the plurality of elongated segments to facilitate access into the coil volume.