Patents Assigned to NMR Holdings No. 2 Pty Limited
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Publication number: 20120258862Abstract: A magnetic resonance system is provided which employs a shielded, electromagnetically asymmetric and low-stress magnet to produce a superior sized imaging region close to the patient side. The magnet has a double layered configuration. In the primary layer, the magnet includes at least two strongest coils at two ends of the magnet (end coils), which carry current in the same direction. The magnet may include at least one coil close to the end coils which carries current in a direction opposite to that of the end coils. The magnet employs a plurality of smaller sized coils (4-7, relative to the large end-coils) in the central region of the primary layer, and these coils are located asymmetrically relative to the imaging region centre. The magnet is shielded by a plurality (1-5) of shielding coils, which carry current in a direction opposite to that of the end-coils at primary layer.Type: ApplicationFiled: December 20, 2010Publication date: October 11, 2012Applicant: NMR HOLDINGS NO. 2 PTY LIMITEDInventors: Feng Liu, Riyu Wei, Stuart Crozier
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Patent number: 7348780Abstract: Asymmetric radio frequency (RF) coils for magnetic resonance applications are provided. Also provided are time harmonic methods for designing such coils as well as symmetric coils. In addition, methods for converting complex current density functions into discrete capacitive and inductive elements are provided.Type: GrantFiled: April 12, 2004Date of Patent: March 25, 2008Assignee: NMR Holdings No. 2 Pty LimitedInventors: Stuart Crozier, Ben Lawrence, Desmond Yau, Kurt Luescher, Wolfgang Udo Roffman, David Michael Doddrell
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Publication number: 20040189303Abstract: Asymmetric radio frequency (RF) coils for magnetic resonance applications are provided. Also provided are time harmonic methods for designing such coils as well as symmetric coils. In addition, methods for converting complex current density functions into discrete capacitive and inductive elements are provided.Type: ApplicationFiled: April 12, 2004Publication date: September 30, 2004Applicant: NMR Holdings No. 2 Pty LimitedInventors: Stuart Crozier, Ben Lawrence, Desmond Yau, Kurt Luescher, Wolfgang Udo Roffman, David Michael Doddrell
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Patent number: 6720768Abstract: Asymmetric radio frequency (RF) coils for magnetic resonance applications are provided. Also provided are time harmonic methods for designing such coils as well as symmetric coils. In addition, methods for converting complex current density functions into discrete capacitive and inductive elements are provided.Type: GrantFiled: September 5, 2001Date of Patent: April 13, 2004Assignee: NMR Holdings No. 2 Pty LimitedInventors: Stuart Crozier, Ben Lawrence, Desmond Yau, Kurt Luescher, Wolfgang Udo Roffman, David Michael Doddrell
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Patent number: 6700468Abstract: Asymmetric, compact non-superconducting magnets for magnetic resonance imaging are provided. The magnets have a homogeneous region (the “dsv”) which can be located close to one end of the magnet so as to reduce the sensation of claustrophobia experienced by patients undergoing MRI procedures. The magnets can be designed using a hybrid process in which current density analysis is performed to obtain an initial coil configuration which is then refined using non-linear optimization techniques to obtain a final coil configuration. The hybrid method can incorporate various constraints, including, the location and size of the dsv, the uniformity and strength of the B0 field, stray field strengths outside of the non-superconducting magnet, and field strengths within the magnet's coils. The hybrid technique can also be used to design compact symmetric non-superconducting magnets.Type: GrantFiled: November 30, 2001Date of Patent: March 2, 2004Assignee: NMR Holdings No. 2 Pty LimitedInventors: Stuart Crozier, David M. Doddrell, Huawei Zhao
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Patent number: 6664879Abstract: Asymmetric tesseral coils and sets for magnetic resonance applications are provided. Also provided are methods for designing such coils, as well as coils generating arbitrary field profiles. In certain embodiments, the coils are rigorously constrained to have finite dimensions.Type: GrantFiled: September 4, 2002Date of Patent: December 16, 2003Assignee: NMR Holdings No. 2 Pty LimitedInventors: Lawrence Kennedy Forbes, Stuart Crozier
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Patent number: 6377148Abstract: Asymmetric zonal shim coils and shim sets for magnetic resonance applications are provided. Also provided are Fourier-series based methods for designing such coils as well as symmetric coils.Type: GrantFiled: August 27, 2001Date of Patent: April 23, 2002Assignee: NMR Holdings No. 2 Pty LimitedInventors: Lawrence Kennedy Forbes, Stuart Crozier, David Michael Doddrell
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Patent number: RE39460Abstract: Asymmetric, compact superconducting magnets for magnetic resonance imaging are provided. The magnets have a homogeneous region (the “dsv”) which can be located close to one end of the magnet so as to reduce the sensation of claustrophobia experienced by patients undergoing MRI procedures. The magnets can be designed using a hybrid process in which current density analysis is performed to obtain an initial coil configuration which is then refined using non-linear optimization techniques to obtain a final coil configuration. The hybrid method can incorporate various constraints, including, the location and size of the dsv, the uniformity and strength of the B0 field, stray field strengths outside of the superconducting magnet, and field strengths within the magnet's coils. The hybrid technique can also be used to design compact symmetric superconducting magnets.Type: GrantFiled: October 30, 2002Date of Patent: January 9, 2007Assignee: NMR Holdings No. 2 Pty LimitedInventors: Stuart Crozier, David M. Doddrell, Huawei Zhao