# US 11,029,376 B2 · Radio-frequency coil for magnetic resonance device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,376 B2 - Document ID: US11029376B2 - Status: Granted - Kind: B2 - Application number: 16/499,034 - Filed: 2017-12-26 - Published: 2020-02-06 - Granted: 2021-06-08 - Earliest claimed: 2017-03-28 - Assignees: Hefei Institutes of Physical Science, Chinese Academy of Sciences - Applicants: Hefei Institutes of Physical Science, Chinese Academy of Sciences - Inventors: Kai Zhong; Hongyi Yang - Web page: https://patentgrep.com/patent/US11029376B2 ## CPC - G01R 33/341: comprising surface coils - G01R 33/34046: {Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils} - G01R 33/34076: {Birdcage coils} - G01R 33/36: Electrical details, e.g. matching or coupling of the coil to the receiver - 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 33/3678: {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 The present disclosure relates to a radio-frequency coil for a magnetic resonance device, comprising: antenna units, conductor end ring segments connecting the antenna units, and capacitors. Here, a single antenna unit is curved in a plane parallel to a direction of a static magnetic field B0 (the positive direction of the z axis); the cross sections of all the antenna units in a x-y plane are spaced apart from each other at an angle and distributed symmetrically in a radial array; adjacent antenna units are connected with the end ring segments and the capacitors at two ends; the coil as a whole is an open dome shape surface structure and is sufficiently conformal to the surface of an object to be scanned. ## Claims ### Claim 1 A radio-frequency coil for a magnetic resonance device, comprising: i. 2n of curved antenna units, wherein n is an integer of 1 or more; ii. conductor end ring segments connected to two ends of the antenna units; and iii. capacitors connecting adjacent end ring segments, wherein each antenna unit of the 2n of antenna units is curved the same as or similar to each other in a plane parallel to a direction of a static magnetic field B0, and all the 2n of antenna units are not intersected with each other; when viewed in the direction of the static magnetic field B0, the 2n of antenna units are radially distributed, adjacent antenna units are spaced apart from each other at an angle, and all the antenna units as a whole form a symmetrical array; an overall profile of the radio-frequency coil, defined by the curved antenna units, is a dome shape curved surface, and is open on its bottom side, wherein the open side is formed by connecting the end ring segments at two ends of the antenna units and the capacitors in series alternately. ### Claim 2 (depends on 1) The radio-frequency coil according to claim 1, wherein the curved antenna units have a circular arc or elliptic arc shape. ### Claim 3 (depends on 1) The radio-frequency coil according to claim 1, wherein the curved antenna units have a shape conformal to an outer surface profile of an object to be scanned. ### Claim 4 (depends on 1) The radio-frequency coil according to claim 1, wherein when n=1, the angle between adjacent antenna units is less than 180°. ### Claim 5 (depends on 1) The radio-frequency coil according to claim 1, wherein in one plane perpendicular to the direction of the static magnetic field B0, cross sections of all the antenna units have the same width, and a ratio of the width to a distance between any two adjacent antenna units in this plane is constant; in different planes perpendicular to the direction of the static magnetic field B0, the width of each antenna unit is gradually varied along the direction of the static magnetic field B0, but the ratio of the width to a distance between any two adjacent antenna units in each plane of the different planes remains constant. ### Claim 6 (depends on 1) The radio-frequency coil according to claim 1, wherein when n is 2 or more, all of the end ring segments and two outmost antenna units are disposed within one plane and form a planar ring, such that a loop on an opening side of the coil is planar. ### Claim 7 (depends on 1) The radio-frequency coil according to claim 1, wherein 2 identical radio-frequency coils are used as sub-coils and are connected in parallel with capacitors, an angle between the two sub-coils is 90° or approximate to 90°; the entire coil is symmetrical, the coil is fed in quadrature, and two feed ports are located at two electrodes of the capacitors in the centers of the end rings of the sub-coil respectively. ### Claim 8 (depends on 7) The radio-frequency coil according to claim 7, wherein the capacitor in the middle of and connecting the two sub-coils is designed to be a tunable capacitor. ### Claim 9 (depends on 7) The radio-frequency coil according to claim 7, further comprising a balancing and decoupling circuit, which is a loop circuit formed by connecting a tunable capacitor and two antenna units on the outermost side of the coil with a conducting wire at one end of the coil. ### Claim 10 (depends on 1) The radio-frequency coil according to claim 1 used for a high field magnetic resonance device. ### Claim 11 (depends on 2) The radio-frequency coil according to claim 2 used for a high field magnetic resonance device. ### Claim 12 (depends on 3) The radio-frequency coil according to claim 3 used for a high field magnetic resonance device. ### Claim 13 (depends on 4) The radio-frequency coil according to claim 4 used for a high field magnetic resonance device. ### Claim 14 (depends on 5) The radio-frequency coil according to claim 5 used for a high field magnetic resonance device. ### Claim 15 (depends on 6) The radio-frequency coil according to claim 6 used for a high field magnetic resonance device. ### Claim 16 (depends on 7) The radio-frequency coil according to claim 7 used for a high field magnetic resonance device. ### Claim 17 (depends on 8) The radio-frequency coil according to claim 8 used for a high field magnetic resonance device.