# US 12,761,299 B2 · Receiving coil with coil element that receives a magnetic resonance signal having a plurality of different frequencies > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,761,299 B2 - Document ID: US12761299B2 - Status: Granted - Kind: B2 - Application number: 18/191,261 - Filed: 2023-03-28 - Published: 2023-10-05 - Granted: 2026-10-13 - Earliest claimed: 2022-03-31 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Takafumi Ohishi; Sadanori Tomiha - Web page: https://patentgrep.com/patent/US12761299B2 ## CPC - G01R 33/34046: {Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils} - 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 33/341: comprising surface coils - G01R 33/3415: comprising arrays of sub-coils {, i.e. phased-array coils with flexible receiver channels} - G01R 33/3635: {Multi-frequency operation} - G01R 33/3806: {Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets} - 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)} - A61B 5/055: involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging - G01R 33/3642: {Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract In one embodiment, a receiving coil includes at least one coil element that can simultaneously receive a plurality of magnetic resonance signals having different frequencies, wherein a resonance structure for the different frequencies is provided in a single plane in each of the at least one coil element. ## Claims ### Claim 1 A receiving coil, comprising: at least one coil element that can simultaneously receive a magnetic resonance (MR) signal having a plurality of different frequencies, wherein: a resonance structure for the plurality of different frequencies is provided disposed in a single plane in the at least one coil element, the at least one coil element of the receiving coil is configured to receive the MR signal emitted from an object in response to an excitation pulse applied to the object, the object being placed in a static magnetic field; and the MR signal has the plurality of different frequencies depending on a position of the object in the static magnetic field having a non-uniform static magnetic field distribution. ### Claim 2 (depends on 1) The receiving coil according to claim 1, wherein the receiving coil is configured as an array coil in which a plurality of the coil elements are arranged in the single plane. ### Claim 3 (depends on 1) The receiving coil according to claim 1, wherein the at least one coil element is configured as a plurality of loop coils that are arranged in the single plane. ### Claim 4 (depends on 3) The receiving coil according to claim 3, wherein the plurality of loop coils are different in diameter, and are supplied with power from the respective different feeding points, and each of the plurality of loop coils resonates at each of the plurality of different frequencies. ### Claim 5 (depends on 4) The receiving coil according to claim 4, wherein the at least one coil element includes a first loop coil having a first diameter and resonating at a first frequency and a second loop coil having a second diameter and resonating at a second frequency higher than the first frequency, and the second loop coil is disposed in a same plane as the first loop coil, and an entirety or at least a part of the second loop coil is disposed inside a circle formed by the first loop coil. ### Claim 6 (depends on 5) The receiving coil according to claim 5, wherein a first feeding point of the first loop coil and a second feeding point of the second loop coil are provided in the same plane at positions spatially separated from each other by 90 degrees. ### Claim 7 (depends on 4) The receiving coil according to claim 4, wherein the at least one coil element includes one first loop coil having a first diameter and resonating at a first frequency, and two second loop coils, each of which has a second diameter and resonates at a second frequency higher than the first frequency, and the two second loop coils are arranged inside a circle formed by the first loop coil and in a same plane as the first loop coil, in such a manner that the two second loop coils partially overlap each other. ### Claim 8 (depends on 3) The receiving coil according to claim 3, wherein the plurality of loop coils are different in diameter, and are supplied with power from a single feeding point in common, and each of the plurality of loop coils resonates at each of the plurality of different frequencies. ### Claim 9 (depends on 8) The receiving coil according to claim 8, wherein the at least one coil element includes an annular first loop coil having a first diameter and resonating at a first frequency, and an annular second loop coil having a second diameter and resonating at a second frequency higher than the first frequency, and the annular second loop coil is disposed in a same plane as the annular first loop coil in such a manner that the annular second loop coil contacts a circle formed by the annular first loop coil from an inside at the single feeding point. ### Claim 10 (depends on 8) The receiving coil according to claim 8, wherein the at least one coil element includes a rectangular first loop coil resonating at a first frequency, and a rectangular second loop coil being disposed in a same plane as the first loop coil and resonating at a second frequency higher than the first frequency, the second loop coil is disposed inside a rectangle formed by the first loop coil, the receiving coil is configured as an array coil in which a plurality of the coil elements are arranged in the single plane, and the plurality of the coil elements are densely arranged in the array coil so as to be close to each other but without overlapping. ### Claim 11 (depends on 8) The receiving coil according to claim 8, further comprising: a filter configured to separate each of the plurality of different frequencies, and a cable that is connected to the feeding point at one end and is connected to the filter at another end. ### Claim 12 (depends on 1) An MRI apparatus comprising the receiving coil according to claim 1. ### Claim 13 A receiving coil, comprising: at least one coil element that can simultaneously receive a magnetic resonance signal having a plurality of different frequencies, wherein a resonance structure for the plurality of different frequencies is disposed in a single plane in the at least one coil element, the at least one coil element is configured as a broadband coil that is made of a conductor plate of a predetermined shape having an opening of a predetermined shape, a lower limit frequency of bandwidth of the broadband coil is determined by an outer circumferential length of the conductor plate, and an upper limit frequency of the bandwidth of the broad band coil is determined by an inner circumferential length of the conductor plate. ### Claim 14 (depends on 13) The receiving coil according to claim 13, wherein an outer circumferential shape of the conductor plate is a first circle having a first diameter, an outer circumferential shape of the opening is a second circle having a second diameter smaller than the first diameter, the opening is formed in such a manner that the second circle contacts the first circle from the inside at a point, and a feeding point is provided at the point where the second circle contacts the first circle. ### Claim 15 (depends on 13) The receiving coil according to claim 13, wherein a plurality of smaller openings are provided in the conductor plate around the opening. ### Claim 16 (depends on 13) The receiving coil according to claim 13, further comprising: a filter configured to separate each of the plurality of different frequencies, and a cable that is connected to a feeding point at one end and is connected to the filter at another end. ### Claim 17 A receiving coil, comprising: at least one coil element that can simultaneously receive a magnetic resonance signal having a plurality of different frequencies, wherein a resonance structure for the plurality of different frequencies is disposed in a single plane in the at least one coil element, the at least one coil element is configured as a pair of sub-coil elements that have a same diameter and are disposed in the single plane with a predetermined distance so as not to overlap each other, and each of the pair of sub-coil elements is separately provided with a feeding point and resonates at a first resonance frequency and a second resonance frequency higher than the first resonance frequency. ### Claim 18 (depends on 17) The receiving coil according to claim 17, wherein each of the pair of sub-coil elements is configured to adjust frequency characteristics including the first resonance frequency and the second resonance frequency by changing the predetermined distance between the pair of sub-coil elements. ### Claim 19 (depends on 17) The receiving coil according to claim 17, wherein the predetermined distance is adjusted in such a manner that a second S11 parameter corresponding to the second resonance frequency is smaller than a first S11 parameter corresponding to the first resonance frequency. ### Claim 20 (depends on 18) The receiving coil according to claim 18, wherein the predetermined distance is adjusted in such a manner that a second S11 parameter corresponding to the second resonance frequency is smaller than a first S11 parameter corresponding to the first resonance frequency.