# US 9,753,105 B2 · Debugging device for a body coil of a magnetic resonance imaging system

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- Number: US 9,753,105 B2
- Document ID: US9753105B2
- Status: Granted
- Kind: B2
- Application number: 14/229,896
- Filed: 2014-03-29
- Published: 2014-11-06
- Granted: 2017-09-05
- Earliest claimed: 2013-03-29
- Assignees: Siemens Aktiengesellschaft
- Applicants: Hou Quan Lin; Yu Tang; JianMin Wang; Qiu Yi Zhang
- Inventors: Hou Quan Lin; Yu Tang; JianMin Wang; Qiu Yi Zhang
- Web page: https://patentgrep.com/patent/US9753105B2

## CPC

- G01R 33/365: {Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array}
- G01R 33/34046: {Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils}
- G01R 33/3678: {involving quadrature drive or detection, e.g. a circularly polarized RF magnetic field}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A debugging device for a body coil of a magnetic resonance imaging (MRI) system includes a pair of output ports connected to a pair of input ports of the body coil. The debugging device also includes a pair of input ports connected to a pair of output ports of the MRI system. The debugging device includes a pair of extension circuits, separately connected between the pair of input ports and the pair of output ports; and a first adjustment capacitor for reducing or eliminating coupling between the pair of input ports. The first adjustment capacitor is bridged between the pair of input ports, and the capacitance of the first adjustment capacitor is variable.

## Claims

### Claim 1

A debugging device for a body coil of a magnetic resonance imaging (MRI) system, the debugging device comprising:
a pair of output ports connected to a pair of input ports of the body coil;
a pair of input ports connected to a pair of output ports of the MRI system;
a pair of extension circuits separately connected between the pair of input ports and the pair of output ports; and
a first adjustment capacitor operable for reducing or eliminating coupling between the pair of input ports, the first adjustment capacitor being bridged between the pair of input ports, and the capacitance of the first adjustment capacitor being variable;
wherein the pair of extension circuits further comprise a pair of first coaxial lines, the pair of first coaxial lines having the same length, and two ends of the first adjustment capacitor are each connected between a different one of the input ports and the first coaxial line connected thereto,
wherein the pair of extension circuits further comprise a pair of second coaxial lines separately connected between the pair of first coaxial lines and the pair of output ports,
a second adjustment capacitor operable for reducing or eliminating coupling between the pair of input ports, two ends of the second adjustment capacitor each being connected between a different one of the first coaxial lines and the second coaxial line connected thereto,
wherein the pair of second coaxial lines are of the same length, and the capacitance of the second adjustment capacitor is variable, and
wherein the length of the pair of first coaxial lines and the length of the pair of second coaxial lines are such that adjustment to coupling between the pair of input ports performed by the first adjustment capacitor effects the transmission coefficient between the pair of input ports orthogonally to adjustment to coupling between the pair of input ports performed by the second adjustment capacitor,
wherein the debugging device moves the debugging operation of decoupling outside of the body coil.

### Claim 2 (depends on 1)

The debugging device of claim 1, wherein the length of the pair of first coaxial lines and the length of the pair of second coaxial lines are fixed.

### Claim 3 (depends on 1)

The debugging device of claim 1, wherein the pair of extension circuits comprises a pair of series resonant circuits, wherein the pair of series resonant circuits comprises a resonant capacitor and a resonant inductor, the resonant capacitor and the resonant inductor resonating at a working frequency of the body coil, and two ends of the first adjustment capacitor each being connected between the resonant capacitor and the resonant inductor of a different one of the series resonant circuits.

### Claim 4 (depends on 3)

The debugging device of claim 3, wherein the capacitances of the resonant capacitors in the pair of resonant capacitors are equal and variable, and the inductances of the resonant inductors in the pair of resonant inductors are equal and variable.

### Claim 5

A body coil for a magnetic resonance imaging (MRI) system, the body coil comprising:
a debugging device comprising:
a pair of output ports connected to a pair of input ports of the body coil;
a pair of input ports connected to a pair of output ports of the MRI system;
a pair of extension circuits separately connected between the pair of input ports and the pair of output ports; and
a first adjustment capacitor operable for reducing or eliminating coupling between the pair of input ports, the first adjustment capacitor being bridged between the pair of input ports, and the capacitance of the first adjustment capacitor being variable,
wherein the pair of first coaxial lines have the same length, and two ends of the first adjustment capacitor are each connected between a different one of the input ports and the first coaxial line connected thereto,
wherein the pair of extension circuits further comprises a pair of second coaxial lines, separately connected between the pair of first coaxial lines and the pair of output ports,
wherein the debugging device further comprises a second adjustment capacitor operable for reducing or eliminating coupling between the pair of input ports, two ends of the second adjustment capacitor each being connected between a different one of the first coaxial lines and the second coaxial line connected thereto,
wherein the pair of second coaxial lines are of the same length, and the capacitance of the second adjustment capacitor is variable,
wherein the length of the pair of first coaxial lines and the length of the pair of second coaxial lines are such that adjustment to coupling between the pair of input ports performed by the first adjustment capacitor effects the transmission coefficient between the pair of input ports orthogonally to adjustment to coupling between the pair of input ports performed by the second adjustment capacitor,
wherein the debugging device moves the debugging operation of decoupling outside of the body coil.

### Claim 6 (depends on 5)

The body coil of claim 5, wherein the length of the pair of first coaxial lines and the length of the pair of second coaxial lines are fixed.

### Claim 7 (depends on 5)

The body coil of claim 5, wherein the pair of extension circuits comprises a pair of series resonant circuits, wherein the pair of series resonant circuits comprises a resonant capacitor and a resonant inductor, the resonant capacitor and the resonant inductor resonating at a working frequency of the body coil, and two ends of the first adjustment capacitor each being connected between the resonant capacitor and the resonant inductor of a different one of the series resonant circuits.

### Claim 8 (depends on 7)

The body coil of claim 7, wherein the capacitances of the resonant capacitors in the pair of resonant capacitors are equal and variable, and the inductances of the resonant inductors in the pair of resonant inductors are equal and variable.

### Claim 9

A magnetic resonance imaging (MRI) system comprising:
a body coil comprising:
a debugging device comprising:
a pair of output ports connected to a pair of input ports of the body coil;
a pair of input ports connected to a pair of output ports of the MRI system;
a pair of extension circuits separately connected between the pair of input ports and the pair of output ports; and
a first adjustment capacitor operable for reducing or eliminating coupling between the pair of input ports, the first adjustment capacitor being bridged between the pair of input ports, and the capacitance of the first adjustment capacitor being variable,
wherein the pair of extension circuits comprises a pair of first coaxial lines,
wherein the pair of first coaxial lines have the same length, and two ends of the first adjustment capacitor are each connected between a different one of the input ports and the first coaxial line connected thereto,
wherein the pair of extension circuits further comprises a pair of second coaxial lines, separately connected between the pair of first coaxial lines and the pair of output ports,
wherein the debugging device further comprises a second adjustment capacitor operable for reducing or eliminating coupling between the pair of input ports, two ends of the second adjustment capacitor each being connected between a different one of the first coaxial lines and the second coaxial line connected thereto,
wherein the pair of second coaxial lines are of the same length, and the capacitance of the second adjustment capacitor is variable,
wherein the length of the pair of first coaxial lines and the length of the pair of second coaxial lines are such that adjustment to coupling between the pair of input ports performed by the first adjustment capacitor effects the transmission coefficient between the pair of input ports orthogonally to adjustment to coupling between the pair of input ports performed by the second adjustment capacitor,
wherein the debugging device moves the debugging operation of decoupling outside of the body coil.

### Claim 10 (depends on 9)

The MRI system of claim 9, wherein the length of the pair of first coaxial lines and the length of the pair of second coaxial lines are fixed.

### Claim 11 (depends on 9)

The MRI system of claim 9, wherein the pair of extension circuits comprises a pair of series resonant circuits, wherein the pair of series resonant circuits comprises a resonant capacitor and a resonant inductor, the resonant capacitor and the resonant inductor resonating at a working frequency of the body coil, and two ends of the first adjustment capacitor each being connected between the resonant capacitor and the resonant inductor of a different one of the series resonant circuits.