Systems and methods for common mode traps in MRI systems
First Claim
1. A common mode trap for a magnetic resonance imaging (MRI) apparatus, comprising:
- a first conductor and a second conductor counterwound around a length of a central conductor, wherein the first and the second conductors are radially spaced a first distance from the central conductor at first and second ends of the length, wherein the first and the second conductors are radially spaced a second distance larger than the first distance from the central conductor at a midpoint of the length, and wherein a radial distance of the first and the second conductors tapers from the second distance at the midpoint to the first distance at the first and the second ends of the length.
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Abstract
Various methods and systems are provided for a common mode trap for a magnetic resonance imaging (MRI) apparatus. In one embodiment, a common mode trap for an MRI apparatus comprises: a first conductor and a second conductor counterwound around a length of a central conductor, wherein the first and the second conductors are radially spaced a first distance from the central conductor at first and second ends of the length, and wherein the first and the second conductors are radially spaced a second distance larger than the first distance from the central conductor at a midpoint of the length. In this way, coupling and subsequent detuning of common mode traps provided adjacent to one another may be prevented.
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Citations
20 Claims
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1. A common mode trap for a magnetic resonance imaging (MRI) apparatus, comprising:
a first conductor and a second conductor counterwound around a length of a central conductor, wherein the first and the second conductors are radially spaced a first distance from the central conductor at first and second ends of the length, wherein the first and the second conductors are radially spaced a second distance larger than the first distance from the central conductor at a midpoint of the length, and wherein a radial distance of the first and the second conductors tapers from the second distance at the midpoint to the first distance at the first and the second ends of the length. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A common mode trap assembly for a magnetic resonance imaging (MRI) system, comprising:
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a central conductor with a length and configured to transmit a signal between an MRI radio frequency coil and a processing element of the MRI system; and a plurality of common mode traps extending along at least a portion of the length of the central conductor, the common mode traps configured to provide an impedance to reduce transmitter-driven currents of the MRI system, wherein each of the common mode traps comprises a second length and includes a first conductor and a second conductor counterwound around the central conductor, wherein the first and the second conductors are radially spaced a first distance from the central conductor at first and second ends of the second length, wherein the first and the second conductors are radially spaced a second distance larger than the first distance from the central conductor at a midpoint of the second length, and wherein a radial distance of the first and the second conductors tapers from the second distance at the midpoint of the second length to the first distance at the first and the second ends of the second length. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for providing a transmission cable for a radio frequency (RF) coil of a magnetic resonance imaging (MRI) system, comprising:
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providing a central conductor of a length and configured to transmit a signal between the RF coil and a processing element of the MRI system; wrapping a first common mode trap conductor in a tapered spiral in a first direction about the central conductor along at least a portion of the length of the central conductor; and wrapping a second common mode trap conductor in a tapered spiral in a second direction opposite to the first direction about the central conductor along the portion of the length, wherein the tapered spiral of the first and the second common mode trap conductors includes a tapering in radial distance from a midpoint of the portion of the length towards a first end and a second end of the portion of the length. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification