Patents by Inventor Markus Weiger
Markus Weiger 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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Patent number: 11215687Abstract: A method for generating an image data set of an image area located in a measurement volume of a magnetic resonance system comprising a gradient system and an RF transmission/reception system, comprises the following method steps: —reading out k-space corresponding to the imaging area, by: (a) activating a frequency encoding gradient in a predetermined spatial direction and with a predetermined strength G0 by means of said gradient system, (b) after the activated frequency encoding gradient achieves its strength G0, radiating a non-slice-selective RF excitation pulse by means of said RF transmission/reception system, (c) after a transmit-receive switch time ?tTR following the radiated excitation pulse, acquiring FID signals with said RF transmission/reception system and storing said FID signals as raw data points in k-space along a radial k-space trajectory that is predetermined by the direction and strength G0 of the frequency encoding gradient, (d) repeating (a) through (c) with respectively different frequeType: GrantFiled: October 8, 2018Date of Patent: January 4, 2022Assignees: ETH Zurich, UNIVERSITAET ZUERICHInventors: Romain Froidevaux, Markus Weiger
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Publication number: 20200363484Abstract: A method for generating an image data set of an image area located in a measurement volume of a magnetic resonance system comprising a gradient system and an RF transmission/reception system, comprises the following method steps: —reading out k-space corresponding to the imaging area, by: (a) activating a frequency encoding gradient in a predetermined spatial direction and with a predetermined strength G0 by means of said gradient system, (b) after the activated frequency encoding gradient achieves its strength G0, radiating a non-slice-selective RF excitation pulse by means of said RF transmission/reception system, (c) after a transmit-receive switch time ?tTR following the radiated excitation pulse, acquiring FID signals with said RF transmission/reception system and storing said FID signals as raw data points in k-space along a radial k-space trajectory that is predetermined by the direction and strength G0 of the frequency encoding gradient, (d) repeating (a) through (c) with respectively different frequeType: ApplicationFiled: October 8, 2018Publication date: November 19, 2020Applicants: ETH Zurich, UNIVERSITAET ZUERICHInventors: Romain FROIDEVAUX, Markus WEIGER
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Patent number: 8633696Abstract: A method for designing the time dependence function km(t) for a given k-space trajectory km, where m stands for one or multiple of the spatial dimension indices x, y, or z, of a magnetic resonance imaging (=MRI) experiment carried out on an MRI system, wherein the trajectory km is generated by applying a time varying waveform gm(t) of a gradient magnetic field, the method taking into account—the gradient magnitude limit G and—the gradient slew rate limit S of the MRI system, is characterized in that the method further takes into account a given frequency limit F in such a way that the gradient waveform gm(t) does not contain frequency components above the frequency limit F which is characteristic for the gradient hardware of the MRI system. The invention provides a method for designing a time dependence function for a given k-space trajectory, which allows obtaining better quality MRI images.Type: GrantFiled: March 16, 2011Date of Patent: January 21, 2014Assignee: Bruker BioSpin MRI GmbHInventors: Markus Weiger Senften, Thomas Oberhammer, Franciszek Hennel
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Patent number: 8432165Abstract: A method for magnetic resonance spectroscopy (=MRS) or magnetic resonance imaging (=MRI) in which an NMR time-domain signal is generated by an excited transverse nuclear magnetization precessing about the applied magnetic field, whereby the RF excitation pulse is adapted to cover a whole range of NMR frequencies of interest present in the object, and time-domain signal acquisition takes place during, or during and after the application of the RF excitation pulse, is characterized in that spectral or image data are reconstructed by a matrix product of a reconstruction matrix and a vector of time-domain signal points, the reconstruction matrix being an inversion of an encoding matrix. An improved method for reconstructing spectral or image data from a time-domain signal is thereby provided which is more versatile than conventional Fourier transform.Type: GrantFiled: March 2, 2010Date of Patent: April 30, 2013Assignee: Bruker BioSpin MRI GmbHInventors: Markus Weiger Senften, Franciszek Hennel
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Publication number: 20110234227Abstract: A method for designing the time dependence function km(t) for a given k-space trajectory km, where m stands for one or multiple of the spatial dimension indices x, y, or z, of a magnetic resonance imaging (=MRI) experiment carried out on an MRI system, wherein the trajectory km is generated by applying a time varying waveform gm(t) of a gradient magnetic field, the method taking into account—the gradient magnitude limit G and—the gradient slew rate limit S of the MRI system, is characterized in that the method further takes into account a given frequency limit F in such a way that the gradient waveform gm(t) does not contain frequency components above the frequency limit F which is characteristic for the gradient hardware of the MRI system. The invention provides a method for designing a time dependence function for a given k-space trajectory, which allows obtaining better quality MRI images.Type: ApplicationFiled: March 16, 2011Publication date: September 29, 2011Applicant: Bruker BioSpin MRI GmbHInventors: Markus Weiger Senften, Thomas Oberhammer, Franciszek Hennel
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Patent number: 7605589Abstract: A method for homogenizing a static magnetic field with a magnetic field distribution B0(r) for nuclear magnetic resonance spectroscopy by adjusting the currents Ci through the shim coils, thus creating spatial field distributions Ci·Si(r), where r stands for one, two, or three of the spatial dimensions x, y, and z, and said magnetic field distribution B0(r) has only a field component along z, in a working volume of a magnetic resonance apparatus with one or more radio frequency (=RF) coils (5) for inducing RF pulses and receiving RF signals within a working volume, said RF coils having a spatial sensitivity distribution of magnitudes B1k(r), and with shim coils (6) for homogenizing the magnetic field within the working volume, said shim coils (6) being characterized by their magnetic field distributions per unit current Si(r) and having components only along z, includes the following steps: (a) Mapping the magnetic field distribution B0(r) of the main magnetic field, (b) calculating a simulated spectrum ISType: GrantFiled: October 18, 2007Date of Patent: October 20, 2009Assignee: Bruker BioSpin AGInventors: Markus Weiger, Michael Fey, Thomas Speck
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Publication number: 20080116894Abstract: A method for homogenizing a static magnetic field with a magnetic field distribution B0(r) for nuclear magnetic resonance spectroscopy by adjusting the currents Ci through the shim coils, thus creating spatial field distributions Ci·Si(r), where r stands for one, two, or three of the spatial dimensions x, y, and z, and said magnetic field distribution B0(r) has only a field component along z, in a working volume of a magnetic resonance apparatus with one or more radio frequency (=RF) coils (5) for inducing RF pulses and receiving RF signals within a working volume, said RF coils having a spatial sensitivity distribution of magnitudes B1k(r), and with shim coils (6) for homogenizing the magnetic field within the working volume, said shim coils (6) being characterized by their magnetic field distributions per unit current Si(r) and having components only along z, includes the following steps: (a) Mapping the magnetic field distribution B0(r) of the main magnetic field, (b) calculating a simulated spectrum ISType: ApplicationFiled: October 18, 2007Publication date: May 22, 2008Inventors: Markus Weiger, Michael Fey, Thomas Speck
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Patent number: 7348775Abstract: A method for homogenizing a static magnetic field with a magnetic field distribution B0(r) for nuclear magnetic resonance spectroscopy by adjusting the currents Ci through the shim coils, thus creating spatial field distributions Ci·Si(r), where r stands for one, two, or three of the spatial dimensions x, y, and z, and said magnetic field distribution B0(r) has only a field component along z, in a working volume of a magnetic resonance apparatus with one or more radio frequency (=RF) coils (5) for inducing RF pulses and receiving RF signals within a working volume, said RF coils having a spatial sensitivity distribution of magnitudes B1k(r), and with shim coils (6) for homogenizing the magnetic field within the working volume, said shim coils (6) being characterized by their magnetic field distributions per unit current Si(r) and having components only along z, includes the following steps: (a) Mapping the magnetic field distribution B0(r) of the main magnetic field, (b) calculating a simulated spectrum ISType: GrantFiled: April 10, 2006Date of Patent: March 25, 2008Assignee: Bruker BioSpin AGInventors: Markus Weiger, Michael Fey, Thomas Speck
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Patent number: 7298143Abstract: In a magnetic resonance imaging method an echo train is generated of successive magnetic resonance signals from an object to be examined. The magnetic resonance signals are received with a degree of undersampling and by means of a receiver antennae system having a spatial sensitivity profile and the degree of undersampling is set on the basis of an amount of phase evolution due to a magnetic susceptibility distribution of the object to be examined.Type: GrantFiled: May 8, 2003Date of Patent: November 20, 2007Assignee: Koninklijke Philips Electronics N.V.Inventors: Thomas Jaermann, Klaas Paul Pruessmann, Markus Weiger, Conny Frauke Schmidt, Peter Boesiger
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Publication number: 20060197526Abstract: A method for homogenizing a static magnetic field with a magnetic field distribution B0(r) for nuclear magnetic resonance spectroscopy by adjusting the currents Ci through the shim coils, thus creating spatial field distributions Ci·Si(r), where r stands for one, two, or three of the spatial dimensions x, y, and z, and said magnetic field distribution B0(r) has only a field component along z, in a working volume of a magnetic resonance apparatus with one or more radio frequency (=RF) coils (5) for inducing RF pulses and receiving RF signals within a working volume, said RF coils having a spatial sensitivity distribution of magnitudes B1k(r), and with shim coils (6) for homogenizing the magnetic field within the working volume, said shim coils (6) being characterized by their magnetic field distributions per unit current Si(r) and having components only along z, includes the following steps: (a) Mapping the magnetic field distribution B0(r) of the main magnetic field, (b) calculating a simulated spectrum IType: ApplicationFiled: April 10, 2006Publication date: September 7, 2006Inventors: Markus Weiger, Michael Fey, Thomas Speck
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Patent number: 7035682Abstract: The degree of sub-sampling in magnetic resonance imaging is such that the ensuing acquisition time for receiving (echo) series of magnetic resonance signals due to an individual RF excitation is shorter than the decay time of such magnetic resonance signals. Preferably, a segmented scan of the k space is performed, the number of segments and the number of lines scanned in each segment being adjustable and a predetermined total number of lines being scanned. Preferably, a small number of segments is used such that the acquisition time for receiving the magnetic resonance signals for the complete magnetic resonance image is shorter than the process time of the dynamic process involved.Type: GrantFiled: February 19, 2003Date of Patent: April 25, 2006Assignee: Koninklijke Philips Electronics N.V.Inventors: Johan Van Den Brink, Romhild Martijn Hoogeveen, Paulus Johannes Maria Folkers, Klaas Paul Pruessmann, Markus Weiger
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Publication number: 20050212517Abstract: In a magnetic resonance imaging method an echo train is generated of successive magnetic resonance signals from an object to be examined.Type: ApplicationFiled: May 8, 2003Publication date: September 29, 2005Inventors: Thomas Jaermann, Klaas Pruessmann, Markus Weiger, Conny Schmidt, Peter Boesiger
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Publication number: 20050200357Abstract: In a magnetic resonance imaging system the receiver antennae system includes receiver coils which are electromagnetically coupled with a relative coupling degree in the range (?, 0.5), preferably in the range (?, 0.2).Type: ApplicationFiled: May 8, 2003Publication date: September 15, 2005Inventors: Klaas Pruessmann, Markus Weiger, Peter Boesiger
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Patent number: 6593740Abstract: The degree of sub-sampling in magnetic resonance imaging is such that the ensuing acquisition time for receiving (echo) series of magnetic resonance signals due to an individual RF excitation is shorter than the decay time of such magnetic resonance signals. Preferably, a segmented scan of the k space is performed, the number of segments and the number of lines scanned in each segment being adjustable and a predetermined total number of lines being scanned. Preferably, a small number of segments is used such that the acquisition time for receiving the magnetic resonance signals for the complete magnetic resonance image is shorter than the process time of the dynamic process involved.Type: GrantFiled: May 17, 2000Date of Patent: July 15, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Johan Van Den Brink, Romhild Martijn Hoogeveen, Paulus Johannes Maria Folkers, Klaas Paul Pruessmann, Markus Weiger
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Publication number: 20030122545Abstract: The degree of sub-sampling in magnetic resonance imaging is such that the ensuing acquisition time for receiving (echo) series of magnetic resonance signals due to an individual RF excitation is shorter than the decay time of such magnetic resonance signals. Preferably, a segmented scan of the k space is performed, the number of segments and the number of lines scanned in each segment being adjustable and a predetermined total number of lines being scanned. Preferably, a small number of segments is used such that the acquisition time for receiving the magnetic resonance signals for the complete magnetic resonance image is shorter than the process time of the dynamic process involved.Type: ApplicationFiled: February 19, 2003Publication date: July 3, 2003Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: Johan Van Den Brink, Romhild Martijn Hoogeveen, Paulus Johannes Maria Folkers, Klaas Paul Pruessmann, Markus Weiger
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Patent number: 6545472Abstract: A magnetic resonance imaging method is proposed wherein a magnetic resonance image is reconstructed from magnetic resonance signals from respective signal channels. More specifically, individual signal channels relate to respective surface coils which are employed as receiver antennas for the magnetic resonance signals. The magnetic resonance signals are acquired with sub-sampling of the k-space. Resampling on a regular square grid is performed, thus enabling fast Fourier transformation in the reconstruction of the magnetic resonance image. Furthermore, the reconstruction is carried out on the basis of the spatial sensitivity profile of the receiver antennas, i.e. of the surface coils, so as to separate contributions from different spatial positions in the sub-sampled magnetic resonance signals. Preferably, a spiral-shaped acquisition trajectory is followed in the k-space.Type: GrantFiled: March 21, 2001Date of Patent: April 8, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Klaas Paul Prüssmann, Markus Weiger, Peter Börnert
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Patent number: 6377045Abstract: A spectroscopic magnetic resonance imaging method involves sub-sampling in the k space. For example, the SENSE technique is applied in spectroscopic MR imaging. Such sub-sampling is also applied in three-dimensional MR imaging.Type: GrantFiled: May 17, 2000Date of Patent: April 23, 2002Assignee: U.S. Philips CorporationInventors: Johan Samuel Van Den Brink, Rudolf Mathias Johannes Nicolaas Lamerichs, Paulus Johannes Maria Folkers, Arianne Margarethe Corinne Van Muiswinkel, Klaas Paul Pruessmann, Markus Weiger, Ulrike Dydak
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Publication number: 20020014889Abstract: A magnetic resonance imaging method is proposed wherein a magnetic resonance image is reconstructed from magnetic resonance signals from respective signal channels. More specifically, individual signal channels relate to respective surface coils which are employed as receiver antennas for the magnetic resonance signals. The magnetic resonance signals are acquired with sub-sampling of the k-space. Resampling on a regular square grid is performed, thus enabling fast Fourier transformation in the reconstruction of the magnetic resonance image. Furthermore, the reconstruction is carried out on the basis of the spatial sensitivity profile of the receiver antennas, i.e. of the surface coils, so as to separate contributions from different spatial positions in the sub-sampled magnetic resonance signals. Preferably, a spiral-shaped acquisition trajectory is followed in the k-space.Type: ApplicationFiled: March 21, 2001Publication date: February 7, 2002Inventors: Klaas Paul Prussmann, Markus Weiger, Peter Bornert
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Patent number: 6326786Abstract: The invention relates to a method for obtaining images by means of magnetic resonance (MR) of an object placed in a static magnetic field which method includes simultaneous measurement of a number sets of MR signals by application gradients and an array of receiver coils, reconstruction of a number of receiver coil images from the sets MR signals measured and reconstruction of a final image from a distant dependent sensitivity of the receiver coils and the first plurality of receiver coil images. In order to reduce the acquisition time the number of phase encoding steps corresponding to the phase-encoding gradient is reduced with a reduction factor compared to standard Fourier imaging, while a same field of view is maintained as in standard Fourier imaging. In this way fast cardiac imaging may be possible.Type: GrantFiled: December 17, 1999Date of Patent: December 4, 2001Assignee: U.S. Philips CorporationInventors: Klaas P. Pruessmann, Markus Weiger, Markus B. Scheidegger, Peter Boesiger
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Patent number: 6087831Abstract: The invention relates to an MR method and an MR device for determining the position of at least one microcoil (11, 12) which is provided in or on an object (1) to be examined which is situated in an examination zone. During the acquisition of microcoil MR signals (S), at least one variable magnetic gradient field acts on the examination zone, so that the k space is scanned at scanning points (k.sub.x (t.sub.i), k.sub.y (t.sub.i)). The position (x, y) of the microcoil (11, 12) is determined from at least three scanning values (S(t.sub.i)) of a microcoil MR signal and the associated scanning points (k.sub.x (T.sub.i), k.sub.y (t.sub.i)) for example by solving a system of equations formed from these values. The MR method can be used for various scanning modes of the k space, and the acquisition of the microcoil MR signals (S) does not require any MR sequences other than the MR sequences required for determining the nuclear magnetization distribution in the examination zone.Type: GrantFiled: February 17, 1998Date of Patent: July 11, 2000Assignee: U.S. Philips CorporationInventors: Peter Bornert, Markus Weiger, Bernd Aldefeld