1
Longzhi Jiang
Evangelos Trifon Laskaris, Yu Wang, Timothy John Havens, Longzhi Jiang: Open superconductive magnet having a cryocooler coldhead. General Electric Company, Marvin Snyder, Douglas E Stoner, March 13, 2001: US06201462 (13 worldwide citation)

An open magnet has vertically aligned first and second assemblies each with at least one superconductive main coil. At least one support member is vertically aligned and attached to, the first and second assemblies. At least one cryocooler coldhead is aligned generally horizontally and has a housing ...


2
Longzhi Jiang
Tesfaye Kebede Kidane, Timothy John Havens, Longzhi Jiang, Mark Haig Khachaturian, Zhenyu Zhang: System and method for modeling gradient coil operation induced magnetic field drift. General Electric Company, Ziolkowski Patent Solutions Group SC, January 29, 2013: US08362773

A system and method for modeling gradient coil operation induced magnetic field drift include a computer programmed to acquire a pulse sequence to be applied during an MR scan and determine a power spectrum of a plurality of gradient pulses of the pulse sequence. The computer is also programmed to c ...


3
Longzhi Jiang
Saikat Saha, Longzhi Jiang, Timothy John Havens: Radio frequency (RF) coil for MRI having high thermal conductivity. General Electric Company, Ziolkowski Patent Solutions Group SC, July 16, 2013: US08487621

An MRI apparatus and method is disclosed comprising a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire ...


4
Longzhi Jiang
Tesfaye Kebede Kidane, Timothy John Havens, Longzhi Jiang, Mark Haig Khachaturian, Zhenyu Zhang: System and method for modeling gradient coil operation induced magnetic field drift. April 5, 2012: US20120082357-A1

A system and method for modeling gradient coil operation induced magnetic field drift include a computer programmed to acquire a pulse sequence to be applied during an MR scan and determine a power spectrum of a plurality of gradient pulses of the pulse sequence. The computer is also programmed to c ...


5
Longzhi Jiang
Saikat Saha, Longzhi Jiang, Timothy John Havens: Radio frequency (rf) coil for mri having high thermal conductivity. March 15, 2012: US20120062231-A1

An MRI apparatus and method is disclosed comprising a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire ...


6
Dan Arthur Gross, David Charles Mack, Timothy John Havens: Superconducting-magnet electrical circuit having voltage and quench protection. General Electric Company, Douglas E Erickson, Marvin Snyder, July 22, 1997: US05650903 (16 worldwide citation)

A superconductive-magnet electrical circuit includes a superconductive-coil assemblage having first, second, third, and fourth coil portions sequentially coupled together in series. A bipolar current-bypass electrical-circuit element (such as a pair of diodes opposingly coupled together in parallel) ...


7
Bizhan Dorri, Evangelos Trifon Laskaris, Michele Dollar Ogle, Timothy John Havens: Cryogenic-fluid-cooled open MRI magnet with uniform magnetic field. General Electric Company, Douglas E Erickson, Marvin Snyder, August 8, 2000: US06100780 (15 worldwide citation)

An open magnetic resonance imaging (MRI) magnet having first and second spaced-apart superconductive coil assemblies each including a toroidal-shaped coil housing containing a superconductive main coil at least partially immersed in a cryogenic fluid such as liquid helium. A generally-non-permanentl ...


8
Timothy John Havens, R Seth Smith: Open architecture magnetic resonance imaging superconducting magnet assembly. General Electric Company, Irving M Freedman, John H Pilarski, December 9, 1997: US05696476 (13 worldwide citation)

A passively shimmed open architecture magnetic resonance imaging magnet utilizing separated superconducting coil assemblies with open space between including means to obtain a uniform magnetic field in the open space by shaped ferromagnetic bands in the bore of the magnets, the shaping including an ...


9
Timothy John Havens, Xianrui Huang, Minfeng Xu: Superconducting magnet correction coil adjustment mechanism. Irving M Freedman, Christian G Cabou, Phyllis Y Price, January 11, 2000: US06014069 (7 worldwide citation)

A correction coil current adjustment circuit for a superconducting magnet to selectively switch various coils in circuit with a power source to provide the desired superconducting current flow and magnetic field homogeneity for magnetic resonance imaging eliminating the need for some of the mechanic ...


10
Timothy John Havens: Combined open and closed magnet configuration for MRI. General Electric Company, Cantor Colburn, September 25, 2007: US07274192 (6 worldwide citation)

A magnetic resonance imaging (MRI) magnet having a first section and a second section is disclosed. The first section has a first housing, and a first set of magnet coils arranged about a common axis that include coils proximate the common axis. The second section has a second housing, and a second ...