Patents by Inventor Jens Frahm
Jens Frahm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230280431Abstract: A method for creating multiple sequences of diffusion-weighted magnetic resonance (MR) images of an object is described, wherein each of said sequences of MR images represents the same series of contiguous cross-sectional slices covering a volume of the object.Type: ApplicationFiled: July 31, 2020Publication date: September 7, 2023Inventors: Jens FRAHM, Dirk VOIT, Oleksandr KALENTEV
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Publication number: 20230243910Abstract: A method for creating, in particular acquiring and reconstructing, a sequence of magnetic resonance (MR) images of an object (1), said sequence of MR images representing a series of cross-sectional slices (2) of the object (1), comprises (a) providing a series of sets of image raw data including an image content of the MR images to be reconstructed, said image raw data being collected with at least one radiofrequency receiver coil of a magnetic resonance imaging (MRI) device, wherein each set of image raw data includes a plurality of data samples being generated in an imaging plane with a gradient-echo sequence that spatially encodes an MRI signal received with the at least one radiofrequency receiver coil using a non-Cartesian k-space trajectory, each set of image raw data comprises a set of homogeneously distributed lines in k-space with equivalent spatial frequency content, the lines of each set of image raw data cross the center of k-space and cover a continuous range of spatial frequencies, the positionsType: ApplicationFiled: May 26, 2020Publication date: August 3, 2023Inventors: Jens FRAHM, Dirk VOIT
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Patent number: 9529066Abstract: A method of collecting magnetic resonance data for imaging an object with a predetermined spin density being arranged in a static magnetic field, comprises the steps subjecting said object to at least one radiofrequency pulse and magnetic field gradients for creating spatially encoded magnetic resonance signals, including at least two settings of spatially encoding phase-contrast gradients differently encoding the phase of said magnetic resonance signals in at least one field of view in a predetermined spatial dimension, acquiring at least two magnetic resonance signals, each with one of said at least two settings of different spatially encoding phase-contrast gradients, and determining at least one mean spin density position of said object along said spatial dimension by calculating the phase difference between said signals. Furthermore, a control device and a magnetic resonance imaging (MRI) device implementing the method are described.Type: GrantFiled: April 21, 2011Date of Patent: December 27, 2016Assignee: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.Inventors: Jens Frahm, Klaus-Dietmar Merboldt, Martin Uecker, Dirk Voit
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Publication number: 20140043026Abstract: A method of collecting magnetic resonance data for imaging an object with a predetermined spin density being arranged in a static magnetic field, comprises the steps subjecting said object to at least one radiofrequency pulse and magnetic field gradients for creating spatially encoded magnetic resonance signals, including at least two settings of spatially encoding phase-contrast gradients differently encoding the phase of said magnetic resonance signals in at least one field of view in a predetermined spatial dimension, acquiring at least two magnetic resonance signals, each with one of said at least two settings of different spatially encoding phase-contrast gradients, and determining at least one mean spin density position of said object along said spatial dimension by calculating the phase difference between said signals. Furthermore, a control device and a magnetic resonance imaging (MRI) device implementing the method are described.Type: ApplicationFiled: April 21, 2011Publication date: February 13, 2014Applicant: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.Inventors: Jens Frahm, Klaus-Dietmar Merboldt, Martin Uecker, Dirk Voit
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Patent number: 8384383Abstract: A method for reconstructing a sequence of magnetic resonance (MR) images of an object under investigation, includes the steps of (a) providing a series of sets of image raw data including an image content of the MR images to be reconstructed, the image raw data being collected with the use of at least one radiofrequency receiver coil of a magnetic resonance imaging (MRI) device, wherein each set of image raw data includes a plurality of data samples being generated with a gradient-echo sequence, in particular a FLASH sequence, that spatially encodes an MRI signal received with the at least one radiofrequency receiver coil using a non-Cartesian k-space trajectory, each set of image raw data includes a set of homogeneously distributed lines in k-space with equivalent spatial frequency content, the lines of each set of image raw data cross the center of k-space and cover a continuous range of spatial frequencies, and the positions of the lines of each set of image raw data differ in successive sets of image rawType: GrantFiled: March 23, 2010Date of Patent: February 26, 2013Assignee: Max-Planck-Gesellschaft zur Foerferung der Wissenschaften E.V.Inventors: Jens Frahm, Martin Uecker, Shuo Zhang
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Publication number: 20110234222Abstract: A method for reconstructing a sequence of magnetic resonance (MR) images of an object under investigation, includes the steps of (a) providing a series of sets of image raw data including an image content of the MR images to be reconstructed, the image raw data being collected with the use of at least one radiofrequency receiver coil of a magnetic resonance imaging (MRI) device, wherein each set of image raw data includes a plurality of data samples being generated with a gradient-echo sequence, in particular a FLASH sequence, that spatially encodes an MRI signal received with the at least one radiofrequency receiver coil using a non-Cartesian k-space trajectory, each set of image raw data includes a set of homogeneously distributed lines in k-space with equivalent spatial frequency content, the lines of each set of image raw data cross the center of k-space and cover a continuous range of spatial frequencies, and the positions of the lines of each set of image raw data differ in successive sets of image rawType: ApplicationFiled: March 23, 2010Publication date: September 29, 2011Applicant: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.Inventors: Jens Frahm, Martin Uecker, Shuo Zhang
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Patent number: 4808928Abstract: The "spoiled FLASH" nuclear magnetic resonance (NMR) method avoids image artifacts which may be caused by transverse magnetization remaining at the end of a TR period of a partial experiment by applying an additional "spoiler" slice gradient pulse ("SP") after the detection of a gradient echo ("Signal") and before the application of the radio frequency pulse (RF) of the following partial experiment. The amplitude-time integral, i.e. the duration and/or the amplitude of the additional spoiler slice gradient pulses is incremented and/or decremented from partial experiment to partial experiment of a given total experiment. Each spoiler amplitude may be repeated after a time of the order of T.sub.2.Type: GrantFiled: November 5, 1987Date of Patent: February 28, 1989Assignee: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.Inventors: Jens Frahm, Wolfgang Hanicke, Klausdietmar Merboldt
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Patent number: 4748409Abstract: A method and an apparatus for a locally resolved investigation of a speci, wherein the specimen is exposed to a constant magnetic field and a variable combination of three gradient magnetic fields directed substantially perpendicularly to each other and to a sequence of high-frequency (RF) pulses which contains three successive pulses with flip angles not equal to .vertline.m Pi.vertline., and signals corresponding to a magnetic resonance of spin moments, in particular nuclear spin moments in said specimen are detected. The interval (tau) between the first and the second pulse is greater than T.sub.2eff and smaller than 5T.sub.2, and that the interval (T-tau) between the second and the third pulse is greater than T.sub.2eff and smaller than 5T.sub.1, whereinm is an integer,T.sub.1 is the spin-lattice relaxation time,T.sub.2 is the spin-spin relaxation time andT.sub.2eff is the effective spin-spin relaxation time of the spins to be determined in the specimen.Type: GrantFiled: December 9, 1985Date of Patent: May 31, 1988Assignee: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften E.V.Inventors: Jens Frahm, Axel Haase, Wolfgang Haenicke, Klaus-Dietmar Merboldt, Dieter Matthaei
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Patent number: 4707658Abstract: A fast low angle shot ("FLASH") NMR method is described, which uses radio frequency excitation pulses having a flip angle substantially less than 90 degrees, and subsequent reading gradient reversal for producing a gradient echo signal. The small flip angle pulses create an equilibrium state between longitudinal and transverse magnetization, which allows to apply the radio frequency pulses repeatedly with high repetition rate to produce gradient echo signals of essentially equal strength, without any intervening delay for magnetization restoration or recovery.Type: GrantFiled: February 12, 1986Date of Patent: November 17, 1987Assignee: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.Inventors: Jens Frahm, Axel Haase, Dieter Matthaei, Wolfgang Haenicke, Klaus-Dietmar Merboldt