# US 2014/0197837 A1 · Application of a Multichannel Coil for Hand Imaging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197837 A1 - Document ID: US20140197837A1 - Status: Published application - Kind: A1 - Application number: 14/154,895 - Filed: 2014-01-14 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: Siemens Aktiengesellschaft - Inventors: Lars Lauer; Dominik Paul; Götz Welsch - Web page: https://patentgrep.com/patent/US20140197837A1 ## CPC - G01R 33/34: Constructional details, e.g. resonators {, specially adapted to MR} - G01R 33/3415: comprising arrays of sub-coils {, i.e. phased-array coils with flexible receiver channels} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A method and a local coil for a magnetic resonance imaging (MRI) system are provided. The local coil includes a hand coil having a plurality of rings, each made of a plurality of coil elements. ## Claims ### Claim 1 A local coil for a magnetic resonance imaging (MRI) system, the local coil comprising: a hand coil comprising a plurality of rings, wherein each ring of the plurality of rings is made of a plurality of coil elements. ### Claim 2 (depends on 1) The local coil of claim 1, wherein the plurality of rings are arranged such that each ring of the plurality of rings is positioned at a different position of a hand during an MRI recording of the hand. ### Claim 3 (depends on 2) The local coil of claim 2, further comprising switching devices for selectively switching at least one ring of the plurality of rings and selectively recording in an imaging fashion at least one individual region of the hand. ### Claim 4 (depends on 3) The local coil of claim 3, further comprising at least one movement-restricting element. ### Claim 5 (depends on 2) The local coil of claim 2, further comprising at least one movement-restricting element. ### Claim 6 (depends on 1) The local coil of claim 1, wherein the plurality of coil elements are arranged such that, during an MRI recording of a hand, the plurality of coil elements permit an MRI recording of the whole hand, cover the length and breadth of the hand, or permit the MRI recording of the whole hand and cover the length and breadth of the hand. ### Claim 7 (depends on 6) The local coil of claim 6, further comprising switching devices for selectively switching at least one ring of the plurality of rings and selectively recording in an imaging fashion at least one individual region of the hand. ### Claim 8 (depends on 7) The local coil of claim 7, further comprising at least one movement-restricting element. ### Claim 9 (depends on 1) The local coil of claim 1, further comprising switching devices each operable for selectively switching at least one ring of the plurality of rings and selectively recording in an imaging fashion at least one individual region of a hand by switching individual rings of the plurality of rings. ### Claim 10 (depends on 1) The local coil of claim 1, wherein the plurality of rings comprises at least three rings or at least four rings, or wherein the hand coil comprises at least 16 channels that are readable in parallel, or wherein the plurality of rings comprises at least three rings or at least four rings, and the hand coil comprises at least 16 channels that are readable in parallel. ### Claim 11 (depends on 1) The local coil of claim 1, further comprising at least one movement-restricting element. ### Claim 12 (depends on 1) The local coil of claim 1, wherein the local coil is operable to detect both a wrist of a hand and metacarpophalangeal joints of the hand in an imaging fashion. ### Claim 13 (depends on 1) The local coil of claim 1, wherein the local coil is a multichannel coil comprising at least nine coil elements, at least nine channels that are readable in parallel for signals of the coil elements, or a combination thereof. ### Claim 14 (depends on 1) The local coil of claim 1, wherein the plurality of rings comprises more than two rings of coil elements. ### Claim 15 (depends on 1) The local coil of claim 1, wherein all or some coil elements of the plurality of coil elements in a ring, in some rings, or in all rings of the plurality of rings of the local coil have the same diameter. ### Claim 16 (depends on 1) The local coil of claim 1, wherein all or some coil elements of the plurality of coil elements in one or more rings of the plurality of rings of the local coil have different diameters. ### Claim 17 (depends on 1) The local coil of claim 1, wherein the size, density, or size and density of the plurality of coil elements enable an MRI recording with a high resolution and a high signal-to-noise ratio. ### Claim 18 (depends on 1) The local coil of claim 1, wherein the local coil is 10-20 cm wide and 10-30 cm long, with respect to the maximum spatial extent of the coil elements. ### Claim 19 (depends on 11) The local coil of claim 11, wherein the at least one movement-restricting element comprises a cushion or padding. ### Claim 20 A method for recording a magnetic resonance imaging (MRI) of a hand, the method comprising: MRI recording of the hand, the MRI recording comprising using a multichannel coil comprising a plurality of rings of coil elements, the plurality of rings being arranged such that the plurality of rings are positioned at different positions of the hand during the MRI recording of the hand.