# US 2010/0164494 A1 · Transmit profile control in mri > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164494 A1 - Document ID: US20100164494A1 - Status: Published application - Kind: A1 - Application number: 12/449,514 - Filed: 2008-02-13 - Published: 2010-07-01 - Earliest claimed: 2006-12-07 - Assignees: The United States of America, as represented by the Secretary, Department of Health and Human Services - Inventors: Alan P. Koretsky - Web page: https://patentgrep.com/patent/US20100164494A1 ## CPC - A61K 33/245: Bismuth; Compounds thereof - A61K 31/29: Antimony or bismuth compounds - A61K 45/06: Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) ## Abstract An apparatus for imaging includes: a main magnet to generate a substantially uniform main B0 magnetic field through an examination region; and a coil system including a first coil layer and a second coil layer disposed substantially parallel to the first coil layer with a defined air gap in a radial direction, the first coil layer including a first coil array, the second coil layer including a second coil array, the first and second coil arrays being coupled and cooperating to selectively produce a prespecified B1 magnetic field within the examination region. ## Claims ### Claim 1 A magnetic resonance imaging apparatus, comprising: a main magnet to generate a substantially uniform main B0 magnetic field through an examination region; and a coil system including a first coil layer and a second coil layer disposed substantially parallel to the first coil layer with a defined air gap in a radial direction, the first coil layer including a first coil array, the second coil layer including a second coil array, the first and second coil arrays being coupled and cooperating to selectively produce a prespecified B1 magnetic field within the examination region. ### Claim 2 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the first and second coil arrays cooperate to reduce inhomogeneities in the B1 magnetic field caused by a subject in the examination region. ### Claim 3 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the first coil array includes at least one of: a birdcage coil; surface coils; a saddle coil; or volumetric transmit coils. ### Claim 4 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the second coil array includes at least one of a surface coil or stripline coils. ### Claim 5 (depends on 4) The magnetic resonance imaging apparatus according to claim 4, wherein the surface coil of the second coil array includes at least one of: overlapped loop coils; touching loop coils; gapped loop coils; or stripline coils. ### Claim 6 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the second coil array includes at least one of: a head coil; or a body coil. ### Claim 7 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the second coil array includes: multiple coil arrays extending in an axial direction. ### Claim 8 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the second coil layer further includes: second coil layers disposed with a defined air gap and substantially parallel one another and the first coil layer in the radial direction. ### Claim 9 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the second coil array includes: coils distributed along an axial direction for a specific radio frequency magnetic field behavior. ### Claim 10 A magnetic resonance imaging method, comprising: generating a substantially uniform main B0 magnetic field through an examination region; and generating a prespecified B1 magnetic field within the examination region. ### Claim 11 (depends on 10) The magnetic resonance imaging method according to claim 10, wherein generating the prespecified B1 magnetic field includes: generating a primary B1′ magnetic field with a first radio frequency coil array disposed in a first coil layer, wherein the first radio frequency coil array is actively driven; generating a secondary B1″ magnetic field with a second radio frequency coil array disposed in a second coil layer, wherein the second radio frequency coil array is a passive radio frequency coil array; and manipulating the primary B1′ magnetic field with the secondary B1″ magnetic field. ### Claim 12 (depends on 11) The magnetic resonance imaging method according to claim 11, wherein the first radio frequency coil array includes at least one of a birdcage coil, a surface coil, or a saddle coil, and wherein the second radio frequency coil array includes a surface coil. ### Claim 13 (depends on 12) The magnetic resonance imaging method according to claim 12, wherein the surface coil of the second coil array includes at least one of: overlapped loop coils, touching loop coils, gapped loop coils, or stripline coils. ### Claim 14 (depends on 12) The magnetic resonance imaging method according to claim 12, wherein the second coil array includes: multiple coil arrays extending in an axial direction. ### Claim 15 (depends on 12) The magnetic resonance imaging method according to claim 12, wherein the second coil array includes: second coil arrays disposed with a defined air gap and substantially parallel one another and the first coil array in the radial direction. ### Claim 16 (depends on 12) The magnetic resonance imaging method according to claim 12, wherein the second coil array includes: coils distributed along an axial direction for a specific magnetic field behavior. ### Claim 17 (depends on 10) The magnetic resonance imaging method according to claim 10, wherein generating the prespecified B1 magnetic field includes at least one of: reducing inhomogeneities in the B1 magnetic field caused by a subject disposed in the examination region; or generating a non-uniform localized B1 magnetic field. ### Claim 18 (depends on 10) A magnetic resonance imaging scanner for performing the method of claim 10. ### Claim 19 A coil arrangement, comprising: a first coil layer including a first coil array; and a second coil layer including a second coil array, the second coil layer being disposed substantially parallel to the first coil layer with a defined air gap in a radial direction, the first and second coil arrays being coupled and cooperating to selectively produce a prespecified magnetic field within an examination region. ### Claim 20 (depends on 19) The coil arrangement according to claim 19, wherein the first and second coil arrays cooperate to selectively produce at least one of a uniform B1 magnetic field or a non-uniform B1 magnetic field within the examination region. ### Claim 21 (depends on 19) The coil arrangement according to claim 19, wherein the first coil array includes at least one of a birdcage coil, surface coils, volumetric coils or a saddle coil, and the second coil array includes at least one of a surface coil or stripline coils. ### Claim 22 (depends on 19) The coil arrangement according to claim 19, wherein the surface coil of the second coil array includes at least one of: overlapped loop coils, touching loop coils, or gapped loop coils, or stripline coils. ### Claim 23 (depends on 19) The coil arrangement according to claim 19, wherein the second coil array includes: multiple second coil arrays extending in an axial direction. ### Claim 24 (depends on 19) The coil arrangement according to claim 19, wherein the second coil layer includes: second coil layers each including at least one second coil array, the second coil layers each being disposed with a defined air gap and substantially parallel one another and the first coil layer in the radial direction.