Patents by Inventor Volker Rasche
Volker Rasche 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: 20230408614Abstract: The present invention relates to a method for acquisition of a magnetic resonance image independent on an a-priori defined field-of-view (FOV), the method comprising the sequence of steps: determining a k-space trajectory for acquisition of k-space MRI data, wherein said k-space trajectory comprises a field-of-view, FOV, independent 3D k-space trajectory, wherein the 3D k-space trajectory for acquisition of the k-space MRI data is independent of an a-priori defined field-of-view of an MRI image to be constructed, in particular wherein said field-of-view-independent 3D k-space trajectory is based on one or more Jacobi theta functions; acquiring k-space MRI data, wherein a gradient waveform corresponding to said field-of-view independent k-space trajectory is applied to magnetic field gradients of the MRI scanner; and selecting a desired field of view for the magnetic resonance image after acquiring the k-space MRI data and constructing the magnetic resonance image based on the desired field of view from the acType: ApplicationFiled: August 30, 2023Publication date: December 21, 2023Inventors: Tobias Speidel, Volker Rasche
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Patent number: 11116444Abstract: Described is a method for detecting and displaying the movement of a temporomandibular joint which connects a lower jaw and an upper jaw by magnetic resonance imaging. A marker is secured to the lower jaw, a marker movement curve is generated using magnetic resonance imaging measurement data sets during a first measurement interval, during which the lower jaw is moved relative to the upper jaw, and a point which corresponds to a first position of the lower jaw relative to the upper jaw is ascertained on the movement curve. An image data set is generated during a second measurement interval, during which the temporomandibular joint is not moved, and a first model, which represents at least one part of the upper jaw and/or a temporal bone part that comprises the temporomandibular joint socket, and a second model, which represents at least one part of the lower jaw, are ascertained therefrom.Type: GrantFiled: December 6, 2017Date of Patent: September 14, 2021Assignee: DENTSPLY SIRONA Inc.Inventors: Volker Rasche, Stefan Wundrak
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Publication number: 20210003649Abstract: Disclosed is a scanning device for magnetic resonance imaging for medical diagnostics, more particularly for dental-medical diagnostics or ENT diagnostics, having a main magnet for generating a static main magnetic field having a homogeneous region, and having at least one transmitting and/or receiving coil for emitting and/or receiving a radio-frequency magnetic field. Provision is made, in particular, for the main magnet to be formed by two poles of magnetically opposite polarities at the end side, such that the static main magnetic field generated by the two poles at the end sides thereof, including the homogeneous region, projects beyond the end sides of the poles.Type: ApplicationFiled: September 21, 2020Publication date: January 7, 2021Applicant: DENTSPLY SIRONA Inc.Inventors: Volker RASCHE, Erich HELL, Johannes ULRICI
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Patent number: 10732244Abstract: A method for operating an imaging system, and a system, apparatus, and computer-readable medium, that operate in accordance with the method. The method includes providing field-of-view (FoV) information, and automatically selecting at least one recording sequence based on at least one of a particular diagnostic application of interest and the FoV information.Type: GrantFiled: March 26, 2012Date of Patent: August 4, 2020Assignee: Sirona Dental Systems GMBHInventors: Volker Rasche, Erich Hell, Johannes Ulrici
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Patent number: 10478089Abstract: Disclosed herein is a method for capturing a dental object with an object volume, in particular, at least one part of a maxilla and/or a mandible, with the sue of an MRT apparatus. A plurality of MRT segment images, which depict the defined segmented volume regions are acquired by an MRT apparatus within a measurement volume of the MRT apparatus. The segmented volume regions overlap no more than partially. In this case a target surface is defined or has already been defined. Then a two dimensional composite image, which corresponds to a two dimensional aggregate image through the target surface within the object volume of the dental object, is generated computer-aided from the individual MRT segment images.Type: GrantFiled: December 11, 2017Date of Patent: November 19, 2019Assignee: DENTSPLY SIRONA Inc.Inventors: Ciamak Abkai, Tim Braun, Jan Paul, Volker Rasche
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Publication number: 20190290190Abstract: Described is a method for detecting and displaying the movement of a temporomandibular joint which connects a lower jaw and an upper jaw by magnetic resonance imaging. A marker is secured to the lower jaw, a marker movement curve is generated using magnetic resonance imaging measurement data sets during a first measurement interval, during which the lower jaw is moved relative to the upper jaw, and a point which corresponds to a first position of the lower jaw relative to the upper jaw is ascertained on the movement curve. An image data set is generated during a second measurement interval, during which the temporomandibular joint is not moved, and a first model, which represents at least one part of the upper jaw and/or a temporal bone part that comprises the temporomandibular joint socket, and a second model, which represents at least one part of the lower jaw, are ascertained therefrom.Type: ApplicationFiled: December 6, 2017Publication date: September 26, 2019Applicant: DENTSPLY SIRONA Inc.Inventors: Volker RASCHE, Stefan WUNDRAK
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Patent number: 10386437Abstract: Disclosed herein is a method for generating an MRI image in which a radial or spiral k-chamber path with a constant angular increment Psi is used to take an MRI image, the angular increment Psi being in the angular range of between 5-55 degrees or being in the corresponding supplementary angle Psi? and is selected according to the formula PsiN,M=pi/(N+1/(M+tau?1)). Alternatively, for an angular increment Psi which deviates from the angle increment of the optimal distribution of n radial profiles Psiopt=180°/n, the minimum scanning efficiency of the angular increment Psi for n>21 profiles is greater than 0.95, the angular increment Psi is in an angular range of 5° to less than 68.7537°, in particular between 5-55 degrees or in the corresponding supplementary angle Psi?. Compared to the arrangement of the radial or spiral profile using the golden angle of 111.Type: GrantFiled: October 7, 2015Date of Patent: August 20, 2019Assignee: DENTSPLY SIRONA Inc.Inventors: Stefan Wundrak, Volker Rasche
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Patent number: 10234529Abstract: Disclosed is a method for producing magnetic resonance tomography images (B) of at least one phase of a cyclic movement, comprising the method steps: production of raw data sets (r1, . . . , rx) of the cyclic movement during a recording period (T) having radial or almost radial k-space part trajectories (k1, . . . , kx); reconstruction of a series of intermediate images (z1, . . . , zy), each from at least one raw data set (r1, . . . , rx) with high time resolution at least for each region (region of interest, ROI) of the raw data sets (r1, . . . , rx); calculation of a distance matrix (D) from the series of intermediate images (z1, . . . , zy), wherein each matrix element (D) corresponds to the distance of a first intermediate image (z1, . . . , zy) of the series to the first or a further intermediate image (z1, . . . , zy) of the series; fitting of functions (vi, . . .Type: GrantFiled: May 19, 2015Date of Patent: March 19, 2019Assignee: DENTSPLY SIRONA INC.Inventors: Volker Rasche, Stefan Wundrak
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Publication number: 20180199852Abstract: Described is an MRI machine for measuring a head area of a patient, comprising at least one primary magnetic field unit, at least one gradient coil assembly, a closed patient opening, at least one excitation coil and at least one receiver coil. In a first region, a closed patient opening of the MRI machine comprises a first inner diameter perpendicular to a center axis of the MRI machine and, in the second region, a second inner diameter, which is arranged parallel to the first inner diameter. The first inner diameter is smaller than the second inner diameter, wherein the first region at least partially comprises the head area of the patient, wherein the second region at least partially comprises a torso area of the patient. The MRI machine is arranged obliquely, wherein, in a z-direction relative to a direction of the gravitational force, the center axis of the MRI machine comprises an angle between 20° and 75°.Type: ApplicationFiled: January 11, 2018Publication date: July 19, 2018Applicant: DENTSPLY SIRONA Inc.Inventors: Erich HELL, Volker RASCHE, Johannes ULRICI
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Publication number: 20180160932Abstract: Disclosed herein is a method for capturing a dental object with an object volume, in particular, at least one part of a maxilla and/or a mandible, with the sue of an MRT apparatus. A plurality of MRT segment images, which depict the defined segmented volume regions are acquired by an MRT apparatus within a measurement volume of the MRT apparatus. The segmented volume regions overlap no more than partially. In this case a target surface is defined or has already been defined. Then a two dimensional composite image, which corresponds to a two dimensional aggregate image through the target surface within the object volume of the dental object, is generated computer-aided from the individual MRT segment images.Type: ApplicationFiled: December 11, 2017Publication date: June 14, 2018Applicant: DENTSPLY SIRONA Inc.Inventors: Ciamak ABKAI, Tim Braun, Jan Paul, Volker Rasche
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Publication number: 20170307711Abstract: Disclosed herein is a method for generating an MRI image in which a radial or spiral k-chamber path with a constant angular increment Psi is used to take an MRI image, the angular increment Psi being in the angular range of between 5-55 degrees or being in the corresponding supplementary angle Psi? and is selected according to the formula PsiN,M=pi/(N+1/(M+tau?1)). Alternatively, for an angular increment Psi which deviates from the angle increment of the optimal distribution of n radial profiles Psiopt=180°/n, the minimum scanning efficiency of the angular increment Psi for n>21 profiles is greater than 0.95, the angular increment Psi is in an angular range of 5° to less than 68.7537°, in particular between 5-55 degrees or in the corresponding supplementary angle Psi?. Compared to the arrangement of the radial or spiral profile using the golden angle of 111.Type: ApplicationFiled: October 7, 2015Publication date: October 26, 2017Applicant: DENTSPLY SIRONA Inc.Inventors: Stefan WUNDRAK, Volker RASCHE
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Publication number: 20170123033Abstract: Disclosed is a method for producing magnetic resonance tomography images (B) of at least one phase of a cyclic movement, comprising the method steps: production of raw data sets (r1, . . . , rx) of the cyclic movement during a recording period (T) having radial or almost radial k-space part trajectories (k1, . . . , kx); reconstruction of a series of intermediate images (z1, . . . , zy), each from at least one raw data set (r1, . . . , rx) with high time resolution at least for each region (region of interest, ROI) of the raw data sets (r1, . . . , rx); calculation of a distance matrix (D) from the series of intermediate images (z1, . . . , zy), wherein each matrix element (D) corresponds to the distance of a first intermediate image (z1, . . . , zy) of the series to the first or a further intermediate image (z1, . . . , zy) of the series; fitting of functions (vi, . . .Type: ApplicationFiled: May 19, 2015Publication date: May 4, 2017Inventors: Volker RASCHE, Stefan WUNDRAK
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Patent number: 9554728Abstract: The present invention relates to visualizing information of an object.Type: GrantFiled: March 1, 2012Date of Patent: January 31, 2017Assignees: KONINKLIJKE PHILIPS N.V., KING'S COLLEGE LONDONInventors: Robert Manzke, Patrick Etyngier, Pascal Yves Francois Cathier, Nicolas Francois Villain, Volker Rasche, Kawaldeep Singh Rhode
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Publication number: 20160313420Abstract: Disclosed is a scanning device for magnetic resonance imaging for medical diagnostics, more particularly for dental-medical diagnostics or ENT diagnostics, having a main magnet for generating a static main magnetic field having a homogeneous region, and having at least one transmitting and/or receiving coil for emitting and/or receiving a radio-frequency magnetic field. Provision is made, in particular, for the main magnet to be formed by two poles of magnetically opposite polarities at the end side, such that the static main magnetic field generated by the two poles at the end sides thereof, including the homogeneous region, projects beyond the end sides of the poles.Type: ApplicationFiled: December 18, 2014Publication date: October 27, 2016Applicant: DENTSPLY SIRONA Inc.Inventors: Volker RASCHE, Erich HELL, Johannes ULRICI
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Patent number: 8847597Abstract: A magnetic field unit of an MRT system for image capturing a head region as the region to be recorded, comprising at least one permanent magnet for generating a main magnetic field, a device for generating a gradient field, and at least one coil for generating and receiving radio frequencies. The magnetic field unit is fastened to a mounting such that a longitudinal axis of the magnetic field unit, together with a vertically extending axis, forms an angle of no more than +45 degrees, and the magnetic field unit and the patient can be adjusted relative to each other such that the magnetic field unit can be moved to a position surrounding the head of the patient.Type: GrantFiled: June 23, 2010Date of Patent: September 30, 2014Assignee: Sirona Dental Systems GmbHInventors: Volker Rasche, Erich Hell, Johannes Ulrici
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Publication number: 20130336558Abstract: The present invention relates to visualizing information of an object.Type: ApplicationFiled: March 1, 2012Publication date: December 19, 2013Applicant: KONINKLIJKE PHILIPS N.V.Inventors: Robert Manzke, Patrick Etyngier, Pascal Yves Francois Cathier, Nicolas Francois Villain, Volker Rasche, Kawaldeep Singh Rhode
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Publication number: 20130252196Abstract: A method for operating an imaging system, and a system, apparatus, and computer-readable medium, that operate in accordance with the method. The method includes providing field-of-view (FoV) information, and automatically selecting at least one recording sequence based on at least one of a particular diagnostic application of interest and the FoV information.Type: ApplicationFiled: March 26, 2012Publication date: September 26, 2013Applicant: SIRONA DENTAL SYSTEMS GMBHInventors: Volker Rasche, Erich Hell, Johannes Ulrici
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Patent number: 8446408Abstract: A method for generating or reconstruction of three-dimensional (3D) images corresponding to a structure of interest (60) including: acquiring a plurality of image projections corresponding to a structure of interest (60); applying a shape model (66) at a selected 3D seed point (64); and adapting the shape model (66) to represent the structure of interest (60), yielding an adapted shape model. A system for generation and reconstruction of three-dimensional (3D) images. The system (10) includes: an imaging system (12) configured to provide projection data corresponding to a structure of interest (60); and a controller (50) in operable communication with the imaging system (50). The controller (50) is configured to: receive the projection data, (64); apply a shape model (66) at a selected 3D seed point (64); and adapt the shape model (66) to represent the structure of interest (60), thereby yielding an adapted shape model.Type: GrantFiled: July 12, 2006Date of Patent: May 21, 2013Assignee: Koninklijke Philips Electronics N.V.Inventors: Michael Grass, Volker Rasche, Dirk Schaefer
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Patent number: 8380007Abstract: System and method for enabling intra-operative selection of an image registration transformation for use in displaying a first image dataset and a second image dataset in correspondence with one another. Image dataset acquisition devices (12, 14) obtain the first and second image datasets. A similarity function indicative of a likelihood that the first and second image datasets are in correspondence with one another is computed by a processor (16) and then a ranking of each of a plurality of local maxima of the similarity function is determined. Registration transformations derived from a plurality of the local maxima are displayed on a display (18), and using a user-interface (22), a physician can select each registration transformation to ascertain visually whether it is the clinically-optimal registration transformation for subsequent use.Type: GrantFiled: December 5, 2006Date of Patent: February 19, 2013Assignee: Koninklijke Philips Electronics N.V.Inventors: Raymond C. Chan, Robert Manzke, Shunmugavelu Sokka, Volker Rasche, Vivek Reddy
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Publication number: 20120146645Abstract: The invention relates to a magnetic field unit (1) of an MRI system (18) for image capturing a head region as the region to be recorded, comprising at least one permanent magnet (2) for generating a main magnetic field, a device (3) for generating a gradient field, and at least one coil (4) for generating and receiving radio frequencies. The magnetic field unit (1) is fastened to a mounting (19) such that a longitudinal axis (A) of the magnetic field unit (1), together with a vertically extending axis, forms an angle of no more than +45° and that the magnetic field unit (1) and the patient (P) can be adjusted relative to each other such that the magnetic field unit (1) can be moved to a position surrounding the head of the patient (P).Type: ApplicationFiled: June 23, 2010Publication date: June 14, 2012Applicant: SIRONA DENTAL SYSTEMS GMBHInventors: Volker Rasche, Erich Hell, Johannes Ulrici