# US 10,310,034 B2 · NMR transmitting/receiving coil configuration

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- Number: US 10,310,034 B2
- Document ID: US10310034B2
- Status: Granted
- Kind: B2
- Application number: 15/091,592
- Filed: 2016-04-06
- Published: 2016-10-20
- Granted: 2019-06-04
- Earliest claimed: 2015-04-15
- Assignees: Bruker BioSpin GmbH
- Applicants: Bruker BioSpin AG
- Inventors: Nicolas Freytag
- Web page: https://patentgrep.com/patent/US10310034B2

## CPC

- G01R 33/3628: {Tuning/matching of the transmit/receive coil}
- G01R 33/34046: {Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils}
- G01R 33/34092: {RF coils specially adapted for NMR spectrometers}
- G01R 33/343: of slotted-tube or loop-gap type
- G01R 33/34069: {Saddle coils}
- G01R 33/3635: {Multi-frequency operation}
- G01R 33/422: of the radio frequency field
- G01R 33/5659: {caused by a distortion of the RF magnetic field, e.g. spatial inhomogeneities of the RF magnetic field (G01R33/56509, G01R33/56518, G01R33/56536 take precedence)}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A nuclear magnetic resonance coil configuration having at least one flat or cylindrical coil (18), through which current flows in operation, which coil generates a high-frequency magnetic B1 field at the location of a sample (16) which is oriented parallel to an x-axis, and which for the purpose of connection to a tuning network is connected to at least two electrical feed lines (11), through which in-phase currents flow in operation, and which generate a high-frequency magnetic B2 field in the sample (16), the orientation of which encloses an angle α with the direction of the B1 field, is characterized in that the following applies for the angle α: α=180°±Δα, where Δα<90°. In this way, a B1 field profile, which is as rectangular as possible and is particularly steep on both sides, can be generated.

## Claims

### Claim 1

A nuclear magnetic resonance coil configuration for examination of a sample, the coil configuration comprising:
at least one flat or cylindrical coil through which a current flows in operation, said current flow in said coil generating a B1 high-frequency magnetic field at a location of the sample, wherein said B1 high-frequency magnetic field is oriented parallel to an x-axis; and
at least two electrical feed lines, said electrical feed lines being disposed, structured and dimensioned to connect said coil to a tuning network, wherein at least a fraction of said current generating said B1 high-frequency magnetic field also flows through said electrical feed lines in operation, said current flow in said electrical feed lines thereby generating a B2 high-frequency magnetic field in the sample having a same phase as said B1 high-frequency magnetic field, said B2 high-frequency magnetic field being oriented at an angle α with respect to a direction of said B1 high-frequency magnetic field, wherein α=180°±Δα, with Δα<90°.

### Claim 2 (depends on 1)

The coil configuration of claim 1, wherein Δα≤45°.

### Claim 3 (depends on 2)

The coil configuration of claim 2, wherein Δα≤15°.

### Claim 4 (depends on 1)

The coil configuration of claim 1, wherein at least two of said electrical feed lines have a crossing point.

### Claim 5 (depends on 1)

The coil configuration of claim 1, further comprising ring elements disposed in a bottom region of the coil configuration, wherein at least two of said electrical feed lines are electromagnetically coupled to said ring elements, said ring elements having a crossing point.

### Claim 6 (depends on 1)

The coil configuration of claim 1, further comprising at least one HF screen, said screen being disposed such that a sum of said B1 and B2 fields is substantially zero in at least a sub-region of the sample.

### Claim 7 (depends on 1)

The coil configuration of claim 1, wherein the coil configuration comprises at least four electrical feed lines forming at least two pairs of said at least two electrical feed lines, said at least four electrical feed lines generating B2i high-frequency fields in the sample during operation, wherein a sum of said B2i fields is substantially zero in at least in a sub-region of the sample.

### Claim 8 (depends on 7)

The coil configuration of claim 7, wherein at least pairs of electrical feed lines are fitted on opposite sides of the coil configuration.

### Claim 9 (depends on 1)

The coil configuration of claim 1, wherein the coil configuration comprises at least two coils which each generate a B1i high-frequency field in operation, said B1i fields being aligned to enclose an angle β between them, wherein |β|<10° or |β−180°|<10°.

### Claim 10 (depends on 9)

The coil configuration of claim 9, further comprising at least one HF screen, wherein, when operating at at least one measuring frequency, a sum of said B1i and said B2 fields is substantially zero in at least a sub-region of the sample.

### Claim 11 (depends on 10)

The coil configuration of claim 10, wherein at least one said HF screen has openings.

### Claim 12 (depends on 11)

The coil configuration claim 11, wherein said openings are slots.