Patents by Inventor Randall Kroeker
Randall Kroeker 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: 11353534Abstract: A method for acquiring a magnetic resonance data set of an object under examination by a magnetic resonance system using a scan sequence is provided. The scan sequence includes a succession of sequence blocks, and in each sequence block, there is at least one sub-block including an excitation section and/or a detection section. An excitation section includes at least one excitation pulse, and in a detection section, an echo signal or an echo train is acquired as a scan signal. At least one item of motion information is provided for each sub-block. The motion information contains information about a movement of the object under examination within a duration of the sub-block. Some of the sub-blocks are automatically repeated. At least the sub-blocks having motion information that exceeds a threshold value are repeated. The threshold value defines a motion amplitude.Type: GrantFiled: November 17, 2020Date of Patent: June 7, 2022Assignee: Siemens Healthcare GmbHInventors: Daniel Nicolas Splitthoff, Tobias Kober, Randall Kroeker, Daniel Przioda, Dominik Paul
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Publication number: 20210325501Abstract: The disclosure relates to a method for correcting a movement of an object occurring during an MR image acquisition. The method includes: determining a motion model describing possible movements of the object based on a defined number of degrees of freedom; detecting a motion of a marker provided on the object with a motion sensor; determining a description of the motion model in a common coordinate system; determining the motion of the marker in the common coordinate system; determining a first motion of the object in the common coordinate system using the description of the motion model, the first motion being the motion that best matches the determined motion of the marker in the common coordinate system using the defined number of degrees of freedom; and correcting the movement of the object based on the determined first motion in order to determine at least one motion corrected MR image.Type: ApplicationFiled: April 8, 2021Publication date: October 21, 2021Inventors: Randall Kroeker, Daniel Przioda, Michael Roas-Löffler, Wilfried Schnell, Daniel Nicolas Splitthoff
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Publication number: 20210149006Abstract: A method for acquiring a magnetic resonance data set of an object under examination by a magnetic resonance system using a scan sequence is provided. The scan sequence includes a succession of sequence blocks, and in each sequence block, there is at least one sub-block including an excitation section and/or a detection section. An excitation section includes at least one excitation pulse, and in a detection section, an echo signal or an echo train is acquired as a scan signal. At least one item of motion information is provided for each sub-block. The motion information contains information about a movement of the object under examination within a duration of the sub-block. Some of the sub-blocks are automatically repeated. At least the sub-blocks having motion information that exceeds a threshold value are repeated. The threshold value defines a motion amplitude.Type: ApplicationFiled: November 17, 2020Publication date: May 20, 2021Inventors: Daniel Nicolas Splitthoff, Tobias Kober, Randall Kroeker, Daniel Przioda, Dominik Paul
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Patent number: 10197658Abstract: A method for using flexible triggered segmentation to optimize magnetic resonance imaging includes partitioning a k-space table into a plurality of k-space segments, each respective k-space segment comprising one or more phase-encoding steps from a plurality of slice-encoding lines. A cardiac cycle is monitored using an electrical signal tracking system and used to trigger acquisition of the plurality of k-space segments over a plurality of acquisition windows.Type: GrantFiled: July 11, 2014Date of Patent: February 5, 2019Assignee: Siemens Healthcare GmbHInventors: Yutaka Natsuaki, Randall Kroeker, Gerhard Laub, Peter Schmitt
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Patent number: 9465093Abstract: In MR imaging of a predetermined volume segment of a living examination subject, the examination subject is stimulated with a defined stimulation pattern, MR data of the predetermined volume segment, are acquired, and MR images based on the MR data are generated that depend on the stimulation pattern. The predetermined volume segment is an internal organ or muscle tissue of the examination subject.Type: GrantFiled: September 5, 2013Date of Patent: October 11, 2016Assignee: Siemens AktiengesellschaftInventors: Andreas Greiser, Jens Guehring, Randall Kroeker, Edgar Mueller, Manuela Rick, Michaela Schmidt, Aurelien Stalder
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Patent number: 9442961Abstract: A system orders acquisition of frequency domain components representing MR image data for storage in a storage array (e.g., k-space). A storage array of individual data elements stores corresponding individual frequency components comprising an MR dataset. The array of individual data elements has a designated center and individual data elements individually have a radius to the designated center. A magnetic field generator generates a magnetic field for use in acquiring multiple individual frequency components corresponding to individual data elements in the storage array. The individual frequency components are successively acquired in an order in which radius of respective corresponding individual data elements increases and decreases as the multiple individual frequency components are sequentially acquired during acquisition of an MR dataset representing an MR image.Type: GrantFiled: January 8, 2013Date of Patent: September 13, 2016Assignees: Siemens Medical Solutions USA, Inc., Siemens AktiengesellschaftInventors: Peter Schmitt, Gerhard Laub, Yutaka Natsuaki, Randall Kroeker
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Publication number: 20150038829Abstract: A method for using flexible triggered segmentation to optimize magnetic resonance imaging includes partitioning a k-space table into a plurality of k-space segments, each respective k-space segment comprising one or more phase-encoding steps from a plurality of slice-encoding lines. A cardiac cycle is monitored using an electrical signal tracking system and used to trigger acquisition of the plurality of k-space segments over a plurality of acquisition windows.Type: ApplicationFiled: July 11, 2014Publication date: February 5, 2015Inventors: Yutaka Natsuaki, Randall Kroeker, Gerhard Laub, Peter Schmitt
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Patent number: 8948484Abstract: A method and system for automated view planning for cardiac magnetic resonance imaging (MRI) acquisition is disclosed. The method and system automatically generate a full scan prescription using a single 3D MRI volume. The left ventricle (LV) is segmented in the 3D MRI volume. Cardiac landmarks are detected in the automatically prescribed slices. A full scan prescription, including a short axis stack and 2-chamber, 3-chamber, and 4-chamber views, is automatically generated based on cardiac anchors provided by the segmented left ventricle and the detected cardiac landmarks in the 3D MRI volume.Type: GrantFiled: November 10, 2011Date of Patent: February 3, 2015Assignees: Siemens Corporation, Siemens Aktiengesellschaft, National Institutes of Health, Siemens Canada Limited, Siemens Medical Solutions USA, Inc.Inventors: Xiaoguang Lu, Jens Guehring, Marie-Pierre Jolly, Bogdan Georgescu, Carmel Hayes, Peter Speier, Michaela Schmidt, Xiaoming Bi, Randall Kroeker, Dorin Comaniciu, Edgar Mueller
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Publication number: 20140062481Abstract: In MR imaging of a predetermined volume segment of a living examination subject, the examination subject is stimulated with a defined stimulation pattern, MR data of the predetermined volume segment, are acquired, and MR images based on the MR data are generated that depend on the stimulation pattern. The predetermined volume segment is an internal organ or muscle tissue of the examination subject.Type: ApplicationFiled: September 5, 2013Publication date: March 6, 2014Inventors: Andreas Greiser, Jens Guehring, Randall Kroeker, Edgar Mueller, Manuela Rick, Michaela Schmidt, Aurelien Stalder
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Publication number: 20130119990Abstract: A system orders acquisition of frequency domain components representing MR image data for storage in a storage array (e.g., k-space). A storage array of individual data elements stores corresponding individual frequency components comprising an MR dataset. The array of individual data elements has a designated center and individual data elements individually have a radius to the designated center. A magnetic field generator generates a magnetic field for use in acquiring multiple individual frequency components corresponding to individual data elements in the storage array. The individual frequency components are successively acquired in an order in which radius of respective corresponding individual data elements increases and decreases as the multiple individual frequency components are sequentially acquired during acquisition of an MR dataset representing an MR image.Type: ApplicationFiled: January 8, 2013Publication date: May 16, 2013Applicants: Siemens Aktiengesellschaft, Siemens Medical Solutions USA, Inc.Inventors: Peter Schmitt, Gerhard Laub, Yutaka Natsuaki, Randall Kroeker
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Patent number: 8378678Abstract: A system orders acquisition of frequency domain components representing MR image data for storage in a storage array (e.g., k-space). A storage array of individual data elements stores corresponding individual frequency components comprising an MR dataset. The array of individual data elements has a designated center and individual data elements individually have a radius to the designated center. A magnetic field generator generates a magnetic field for use in acquiring multiple individual frequency components corresponding to individual data elements in the storage array. The individual frequency components are successively acquired in an order in which radius of respective corresponding individual data elements increases and decreases as the multiple individual frequency components are sequentially acquired during acquisition of an MR dataset representing an MR image.Type: GrantFiled: January 25, 2010Date of Patent: February 19, 2013Assignee: Siemens Medical Solutions USA, Inc.Inventors: Peter Schmitt, Gerhard Laub, Yutaka Natsuaki, Randall Kroeker
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Publication number: 20120121152Abstract: A method and system for automated view planning for cardiac magnetic resonance imaging (MRI) acquisition is disclosed. The method and system automatically generate a full scan prescription using a single 3D MRI volume. The left ventricle (LV) is segmented in the 3D MRI volume. Cardiac landmarks are detected in the automatically prescribed slices. A full scan prescription, including a short axis stack and 2-chamber, 3-chamber, and 4-chamber views, is automatically generated based on cardiac anchors provided by the segmented left ventricle and the detected cardiac landmarks in the 3D MRI volume.Type: ApplicationFiled: November 10, 2011Publication date: May 17, 2012Inventors: Xiaoguang Lu, Jens Guehring, Marie-Pierre Jolly, Bogdan Georgescu, Carmel Hayes, Peter Speier, Michaela Schmidt, Xiaoming Bi, Randall Kroeker, Dorin Comaniciu, Edgar Mueller
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Patent number: 7902823Abstract: Example methods, apparatus, and systems associated with dynamic parallel magnetic resonance imaging (DpMRI) are presented. One example system facilitates separating data associated with a dynamic portion of a dynamic magnetic resonance image from data associated with a static portion of the dynamic magnetic resonance image. The system computes reconstruction parameters for a DpMRI reconstruction processes for both the dynamic portion of the image and the static portion of the image. The example system produces a DpMRI image based on separate reconstructions of the dynamic portion of a dynamic magnetic resonance image and the static portion of a dynamic magnetic resonance image. The separate reconstructions may depend on separate sets of reconstruction parameters and on separated static data and dynamic data.Type: GrantFiled: May 1, 2008Date of Patent: March 8, 2011Inventors: Mark A. Griswold, Martin Blaimer, Randall Kroeker
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Publication number: 20100205143Abstract: A system orders acquisition of frequency domain components representing MR image data for storage in a storage array (e.g., k-space). A storage array of individual data elements stores corresponding individual frequency components comprising an MR dataset. The array of individual data elements has a designated center and individual data elements individually have a radius to the designated center. A magnetic field generator generates a magnetic field for use in acquiring multiple individual frequency components corresponding to individual data elements in the storage array. The individual frequency components are successively acquired in an order in which radius of respective corresponding individual data elements increases and decreases as the multiple individual frequency components are sequentially acquired during acquisition of an MR dataset representing an MR image.Type: ApplicationFiled: January 25, 2010Publication date: August 12, 2010Applicant: Siemens Medical Solutions USA, Inc.Inventors: Randall Kroeker, Gerhard Laub, Yutaka Natsuaki, Peter Schmitt
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Patent number: 7609058Abstract: In a method for operating a magnetic resonance imaging system to generate a magnetic resonance data file, raw magnetic resonance data are acquired, and k-space is established in a computerized storage medium, with k-space being divided into a contiguous central region and a contiguous region surrounding the central region. In a computerized procedure, the raw data are entered into k-space at a constant sampling rate for both of the central and peripheral regions, while sampling the central region with a first density of sampling points, and sampling the peripheral region at a second density of sampling points that is less than the first sampling density. The set of data points thereby representing sampled k-space is made available in a data file as an output from the computerized procedure, in a form allowing an image to be reconstructed from the contents of the data file.Type: GrantFiled: November 8, 2007Date of Patent: October 27, 2009Assignee: Siemens Medical Solutions USA, Inc.Inventors: Gerhard Laub, Randall Kroeker
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Publication number: 20090092303Abstract: Example methods, apparatus, and systems associated with dynamic parallel magnetic resonance imaging (DpMRI) are presented. One example system facilitates separating data associated with a dynamic portion of a dynamic magnetic resonance image from data associated with a static portion of the dynamic magnetic resonance image. The system computes reconstruction parameters for a DpMRI reconstruction processes for both the dynamic portion of the image and the static portion of the image. The example system produces a DpMRI image based on separate reconstructions of the dynamic portion of a dynamic magnetic resonance image and the static portion of a dynamic magnetic resonance image. The separate reconstructions may depend on separate sets of reconstruction parameters and on separated static data and dynamic data.Type: ApplicationFiled: May 1, 2008Publication date: April 9, 2009Inventors: Mark A. Griswold, Martin Blaimer, Randall Kroeker
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Publication number: 20080116892Abstract: In a method for operating a magnetic resonance imaging system to generate a magnetic resonance data file, raw magnetic resonance data are acquired, and k-space is established in a computerized storage medium, with k-space being divided into a contiguous central region and a contiguous region surrounding the central region. In a computerized procedure, the raw data are entered into k-space at a constant sampling rate for both of the central and peripheral regions, while sampling the central region with a first density of sampling points, and sampling the peripheral region at a second density of sampling points that is less than the first sampling density. The set of data points thereby representing sampled k-space is made available in a data file as an output from the computerized procedure, in a form allowing an image to be reconstructed from the contents of the data file.Type: ApplicationFiled: November 8, 2007Publication date: May 22, 2008Inventors: Gerhard Laub, Randall Kroeker
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Publication number: 20050279287Abstract: A water container in combination with a water level alerting apparatus comprises a receptacle for containing a suitable amount of water having a high and a low water trip point. A water level detection probe is co-located at each trip point. The probe sends an analogue signal to an integrated circuit where the signal is converted to a digital signal and amplified. The amplified signal triggers a human detectable alarm. The probe is either a conductive metal rod penetrating the receptacle side wall or a metallic strip encircling the exterior of the side wall. The device is operated by an integral DC power source such as a battery.Type: ApplicationFiled: May 31, 2005Publication date: December 22, 2005Inventor: Randall Kroeker
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Patent number: 6434412Abstract: A segmented cine MR pulse sequence of the “TrueFISP”-type having a short repetition time TR is used to acquire MR data during a single breath hold. In the resulting cine images, the blood and the myocardium have distinctly different image contrasts.Type: GrantFiled: May 21, 1999Date of Patent: August 13, 2002Assignee: Siemens Medical Systems, Inc.Inventors: Orlando P. Simonetti, Jeffrey M. Bundy, J. Paul Finn, Randall Kroeker