# US 9,519,037 B2 · Spatially coincident MRI receiver coils and method for manufacturing

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- Number: US 9,519,037 B2
- Document ID: US9519037B2
- Status: Granted
- Kind: B2
- Application number: 13/674,654
- Filed: 2012-11-12
- Published: 2013-05-16
- Granted: 2016-12-13
- Earliest claimed: 2011-11-10
- Assignees: Mayo Foundation for Medical Education and Research
- Applicants: Joel P. Felmlee
- Inventors: Joel P. Felmlee
- Web page: https://patentgrep.com/patent/US9519037B2

## CPC

- G01R 33/34092: {RF coils specially adapted for NMR spectrometers}
- G01R 33/341: comprising surface coils
- G01R 33/3415: comprising arrays of sub-coils {, i.e. phased-array coils with flexible receiver channels}
- G01R 33/34007: {Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A magnetic resonance imaging receiver coil provides for high SNR and high uniformity over a range of loading conditions with layers, or stacks, of independent conductive elements. The plurality of layers preload the receiver coil reducing the circuit variation as the subject coupling and loading varies. The preload is such that coil performance, or SNR, is maintained over a large range of impedance variation. This configuration is designed to exceed the performance of single trace coils over a range of impedance consistent with variations associated with different subjects, and may also incorporate coils of different resonance frequencies.

## Claims

### Claim 1

A radio frequency (RF) coil for use with a magnetic resonance system, comprising:
an insulating layer extending from a top surface to a bottom surface to define a thickness of the insulating layer;
a first conductor element alternating between the top surface of the insulating layer and the bottom surface of the insulating layer;
a second conductor element that is electrically independent from the first conductor element and alternating between the top surface of the insulating layer and the bottom surface of the insulating layer;
a plurality of vias, each of the plurality of vias extending through the insulating layer from the top surface to the bottom surface; and
wherein the first conductor element alternates between the top surface of the insulating layer and the bottom surface of the insulating layer while the second conductor element respectively alternates between the bottom surface and the top surface of the insulating layer at each of the plurality of vias such that the first conductor element and the second conductor element share a substantially similar field-of-view.

### Claim 2 (depends on 1)

The RF coil as recited in claim 1 further comprising an electrical connector for coupling the first conductor and the second conductor elements to a magnetic resonance system, in which the electrical connector is configured such that each of the first and second conductor elements are individually coupled to the magnetic resonance system.

### Claim 3 (depends on 1)

The RF coil as recited in claim 1 in which the first conductor element is tuned to a first resonance frequency and the second conductor element is tuned to a second resonance frequency.

### Claim 4 (depends on 1)

The RF coil as recited in claim 1 in which the insulating layer is a printed circuit board and the first conductor and the second conductor comprise traces on the printed circuit board.

### Claim 5 (depends on 1)

The RF coil as recited in claim 1 in which the insulating layer is a printed circuit board and the first conductor element and the second conductor element comprise traces on the printed circuit board.

### Claim 6 (depends on 1)

The RF coil as recited in claim 1 in which the thickness of the insulating layer defines an inductive coupling between the first conductor element and the second conductor element.

### Claim 7 (depends on 1)

The RF coil as recited in claim 1 in which the thickness of the insulating layer is selected based on a magnetic field strength of the magnetic resonance system for which the RF coil will be used.

### Claim 8 (depends on 7)

The RF coil as recited in claim 7 in which the thickness of the insulating layer is less than about 10 mil for a magnetic field strength of 1.5 Tesla.

### Claim 9 (depends on 7)

The RF coil as recited in claim 7 in which the thickness of the insulating layer is in a range of about 10 mil to about 45 mil for a magnetic field strength of 3 Tesla.