Patents by Inventor Himanshu Bhat
Himanshu Bhat 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: 20180074147Abstract: In a method and apparatus for acquiring magnetic resonance (MR) data, an MR data acquisition scanner is operated, while a subject is situated therein to execute a simultaneous multislice (SMS) turbo spin echo (TSE) sequence by implementing a TSE-based reference scan to acquire reference data and an imaging scan, to acquire raw MR data from the subject. The reference data and the raw MR data are entered into a memory organized as k-space. A computer accesses the memory in order to make the k-space data, composed of said reference data and said image data, available in electronic form, as at least one data file.Type: ApplicationFiled: September 12, 2016Publication date: March 15, 2018Applicant: Siemens Healthcare GmbHInventors: Flavio Carinci, Dominik Paul, Himanshu Bhat, Mario Zeller
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Publication number: 20180031659Abstract: In a magnetic resonance apparatus and method for acquiring magnetic resonance data, a magnetic resonance data acquisition scanner executes a turbo spin echo (TSE) data acquisition sequence with simultaneous multi-slice (SMS) imaging wherein nuclear spins in two different slices of an examination subject are simultaneously excited so as to produce respective echo trains. The magnetic resonance data acquisition scanner is operated with the SMS imaging configured so that magnetic resonance signals from the respective slices have a different contrast, with the SMS being configured to allow evolution of magnetization of the nuclear spins for the second contrast while magnetic resonance signals with the first contrast are being detected. The respective magnetic resonance signals from the two different slices are detected and entered into an electronic memory organized as k-space, as k-space data.Type: ApplicationFiled: July 28, 2016Publication date: February 1, 2018Applicant: Siemens Healthcare GmbHInventors: Himanshu Bhat, Pedro Miguel Itriago Leon, Mario Zeller
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Publication number: 20180024214Abstract: In a magnetic resonance apparatus and a method for operating the MR apparatus to acquire MR data in a single scan with different contrasts, nuclear spins in multiple slices of an examination subject are simultaneously excited in a single scan, with a simultaneous multi-slice acquisition sequence, in which a radio-frequency multi-band binomial pulse is radiated.Type: ApplicationFiled: July 25, 2016Publication date: January 25, 2018Applicant: SIEMENS HEALTHCARE GMBHInventors: Himanshu Bhat, Mario Zeller
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Publication number: 20170322276Abstract: In a method and magnetic resonance (MR) apparatus for combined multislice fingerprinting MR imaging, for each repetition of a repetition sequence, radio-frequency excitation pulses are radiated with flip angles of the radio-frequency excitation pulses being different from one another, at least for a few repetitions. The scattering of the local maxima of the sum of the radio-frequency energy of the radio-frequency excitation pulses as a function of the repetition over the repetition sequence is for example not greater than 80%.Type: ApplicationFiled: May 3, 2017Publication date: November 9, 2017Applicant: Siemens Healthcare GmbHInventors: Himanshu Bhat, Mario Zeller
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Publication number: 20170315202Abstract: In a method and apparatus for acquiring magnetic resonance (MR) raw data, an MR data acquisition scanner is operated to execute a turbo spin echo (TSE) or a turbo gradient spin echo (TGSE) sequence wherein nuclear spins are excited in multiple slices of the examination object simultaneously by radiating at least one radio-frequency (RF) pulse from an RF radiator of the MR data acquisition scanner, thereby causing the excited nuclear spins in said multiple slices to produce an echo train. A multi-band refocusing pulse is radiated that refocuses nuclear spins in at least one of said multiple slices that follows a first of the multiple slices, and readout gradients are activated to acquire MR signals, with respectively different contrasts, at respectively different readout times of the echo train. The read out MR signals are entered into an electronic memory organized as k-space.Type: ApplicationFiled: April 27, 2016Publication date: November 2, 2017Applicant: Siemens Healthcare GmbHInventors: Himanshu Bhat, Pedro Miguel Itriago Leon, Mario Zeller
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Publication number: 20170293010Abstract: In a method and apparatus for acquiring magnetic resonance (MR) raw data with a simultaneous multi-slice (SMS) data acquisition sequence, nuclear spins respectively in multiple slices of the examination subject are simultaneously excited by radiating, from a radio-frequency (RF) radiator of the MR data acquisition scanner, a multi-band (MB) RF pulse. This MB RF pulse in the SMS data acquisition sequence is generated by radiating and superimposing a number of single band (SB) RF pulses emitted from said RF radiator, each having a respectively different flip angle. Raw MR data are acquired from the multiple slices of the examination subject after the simultaneous excitation of nuclear spins in the multiple slices with said MB RF pulse.Type: ApplicationFiled: April 7, 2016Publication date: October 12, 2017Inventors: Himanshu Bhat, Pedro Miguel Itriago Leon, Mario Zeller
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Publication number: 20170199259Abstract: In a method and apparatus for acquiring magnetic resonance (MR) data from a subject, wherein the MR data are acquired in respective data sets individually from multiple slices in a stack within the examination subject, and wherein the number of slices in the stack is not an integer multiple of a number of slices that are desired to be scanned simultaneously, a quotient of the number of slices in the stack and the number of slices to be acquired simultaneously is formed. A protocol for operating the scanner of the apparatus is then determined wherein the number of simultaneously scanned slices is set either by rounding by quotient up to the next highest integer, or rounding the quotient down to the next lowest integer.Type: ApplicationFiled: January 13, 2016Publication date: July 13, 2017Applicant: Siemens Healthcare GmbHInventors: Thomas Beck, Himanshu Bhat, Uvo Hoelscher, Mario Zeller
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Patent number: 9687172Abstract: A system determines motion correction data for use in diffusion MR imaging using an RF signal generator and magnetic field gradient generator which sequentially acquire in a single first direction through a volume, first and second slice sets individually comprising multiple individual diffusion image slices. The first set of slices and the second set of slices are spatially interleaved within the volume, by providing in acquiring the second slice set, a low flip angle RF pulse successively followed by a non-diffusion image data readout magnetic field gradient for acquisition of data representing a two dimensional (2D) non-diffusion image used for motion detection of the first slice set successively followed by, a first diffusion imaging RF pulse followed by a first diffusion imaging phase encoding magnetic field gradient for preparation for acquiring data representing a diffusion image slice of the second slice set.Type: GrantFiled: June 20, 2012Date of Patent: June 27, 2017Assignees: National Institute of Health (NIH), The United States of America, U.S. Dept. of Health and Human Services (DHHS), Siemens Healthcare GmbHInventors: Himanshu Bhat, Andre Jan Willem Van Der Kouwe, Matthew Dylan Tisdall, Keith Aaron Heberlein
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Publication number: 20170139026Abstract: In a magnetic resonance (MR) navigator-based method and apparatus, MR data are acquired from a large joint of a patient, which is not modelable as a whole based on a single rigid body model. The field of view which the MR data are acquired is divided in a processor into multiple sub-sections, with each sub-section being modelable based on a rigid body model. MR navigator signals are acquired from each of the sub-sections, and these navigator signals are used in a motion tracking algorithm that is based on a rigid body model in order to generate a modeling result that tracks the movement of the overall joint within the field of view. The modeling result can be used for prospective or retrospective motion correction of the MR data.Type: ApplicationFiled: November 17, 2015Publication date: May 18, 2017Applicant: SIEMENS HEALTHCARE GMBHInventors: Thomas Beck, Himanshu Bhat
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Publication number: 20170123029Abstract: In a method and apparatus for acquiring magnetic resonance (MR) data, MR signals are acquired simultaneously from N slices of a subject with an SMS factor of S, the N slices respectively being at different positions from an isocenter of the data acquisition scanner, thereby causing said MR signals to be affected differently by Maxwell terms of magnetic fields that give said MR signals respective signal dephasings that are dependent on the distance of a respective slice from the isocenter. The SMS MR data acquisition sequence is executed with a spacing between each pair of adjacent slices being less than or equal to N/2S. A Maxwell correction algorithm is applied to the acquired k-space data by calculating Maxwell correction gradient moments at an average position between each pair of adjacent slices, thereby generating corrected k-space data wherein the signal dephasing of the MR signals from the N slices is reduced.Type: ApplicationFiled: October 28, 2016Publication date: May 4, 2017Applicant: Siemens Healthcare GmbHInventors: Himanshu Bhat, Uvo Hoelscher, Mario Zeller
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Publication number: 20170108567Abstract: A magnetic resonance (MR) method and apparatus use simultaneous multislice imaging, with different excitations being effective for different slices in respective iterations of a single scanning sequence, in order to acquire raw MR data from different multiple slices, with respectively different contrasts, in the single scanning sequence. Single band excitation of a first slice among the multiple slices takes place in a first iteration of the single scanning sequence, with multi-band excitation then occurring for all of the multiple slices. Raw data are then acquired from the first slice, and at least one other slice among the multiple slices, that respectively exhibit different contrasts due to only the first slice being affected by the single band excitation. In a second iteration of the single scanning sequence, another slice is excited with single band excitation, and the first slice is among the multiple slices excited with multi-band excitation.Type: ApplicationFiled: September 12, 2016Publication date: April 20, 2017Applicant: Siemens Healthcare GmbHInventors: Himanshu Bhat, Pedro Miguel Itriago Leon, Dominik Paul, Mario Zeller
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Publication number: 20170089999Abstract: A magnetic resonance method and system are provided for providing improved simultaneous multislice echo planar imaging (EPI) with navigator-based correction of image data for B0 drift and N/2 ghosting. The correction is based on two types of multi-echo phase-encoded navigator sequences having opposite readout gradient polarities, and optionally also uses a non-phase-encoded navigator sequence. One or more navigator sequences can be generated between each RF excitation pulse and the subsequent EPI readout sequence. A dynamic off-resonance in k-space technique can be used to correct for B0 drift, and a modified slice GRAPPA technique that is based on odd and even kernels can provide slice-specific correction for N/2 ghosting effects for the EPI MR image data sets. Various patterns of navigator sequences and/or interpolation of navigator data can be used to improve accuracy of the image data corrections.Type: ApplicationFiled: September 29, 2015Publication date: March 30, 2017Inventors: Mario Zeller, Himanshu Bhat
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Publication number: 20170074960Abstract: In a method and apparatus for acquiring magnetic resonance (MR) data, comprising an MR data acquisition scanner is operated, while a subject is situated therein, to acquire calibration data, and raw data for conversion into image data, by executing an accelerated echo planar imaging data acquisition sequence. The calibration data are acquired by executing a simultaneous echo refocusing sequence in which multiple slices of the examination subject are simultaneously excited. The calibration data and the acquired raw data are entered into an electronic memory during operation of said MR data acquisition scanner, and made available from a processor in electronic form, as at least one data file.Type: ApplicationFiled: September 12, 2016Publication date: March 16, 2017Applicant: Siemens Healthcare GmbHInventors: Himanshu Bhat, Mario Zeller
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Patent number: 9588208Abstract: A method for accelerated segmented magnetic resonance (MR) image data acquisition includes using a plurality of RF pulses to excite one or more slices of an anatomical area of interest according to a predetermined slice acceleration factor. Next, a collapsed image comprising the slices is acquired using a consecutive segment acquisition process. Then, a parallel image reconstruction method is applied to the collapsed image to separate the collapsed image into a plurality of slice images.Type: GrantFiled: May 7, 2014Date of Patent: March 7, 2017Assignees: National Institutes of Health (NIH), U.S. Dept. of Health and Human Services (DHHS), U.S. Government NIH Division of Extramural Inventions and Technology Resources (DEITR), Siemens Healthcare GmbHInventors: Jonathan Rizzo Polimeni, Himanshu Bhat, Keith Aaron Heberlein, Kawin Setsompop, Thomas Witzel, Stephen Farman Cauley
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Patent number: 9588209Abstract: A method for performing multi-slice MR Elastography on an anatomical region of interest associated with a patient includes inducing shear waves at a shear wave frequency value (e.g., between 25-500 Hz) in the anatomical region of interest using an external driver. Next, the anatomical region of interest is imaged during a single patient breath-hold using an MRI acquisition process. Following the MRI acquisition process(es), phase images of the anatomical region of interest are generated based on an acquired RF signal. These phase images may then be processed (e.g., using an inversion algorithm) to generate one or more quantitative images depicting stiffness of the anatomical region of interest. In some embodiments, a wave image is also generated showing propagation of the plurality of shear waves through the anatomical region of interest based on the phase images.Type: GrantFiled: April 18, 2014Date of Patent: March 7, 2017Assignee: Siemens Healthcare GmbHInventors: Agus Priatna, Dingxin Wang, Himanshu Bhat
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Patent number: 9569863Abstract: A system for accelerated segmented magnetic resonance (MR) image data acquisition includes an RF (Radio Frequency) signal generator and a magnetic field gradient generator. The RF signal generator generates RF excitation pulses in anatomy and enabling subsequent acquisition of associated RF echo data. The magnetic field gradient generator generates magnetic field gradients for anatomical volume selection, phase encoding, and readout RF data acquisition in a three dimensional (3D) anatomical volume. The RF signal generator and the magnetic field gradient generator acquire consecutive segments of k-space line data representative of an individual image slice in a gradient echo method by adaptively varying RF excitation pulse flip angle between acquisition of the consecutive segments.Type: GrantFiled: August 5, 2013Date of Patent: February 14, 2017Assignees: Siemens Healthcare GmbH, The General Hospital CorporationInventors: Himanshu Bhat, Jonathan Rizzo Polimeni
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Publication number: 20170038448Abstract: In a method and apparatus for motion-corrected magnetic resonance (MR) imaging, MR data are acquired in a diagnostic scan in respective portions, and between each portion of acquired diagnostic data, a navigator scan is implemented wherein navigator data are acquired simultaneously in multiple slices in a navigator sub-volume that is less than the volume of the acquisition volume. A reference scan is acquired before beginning the diagnostic scan, and the navigator data in the sub-volumes are acquired between the acquisition of the portions of the MR data in the diagnostic scan. Between each acquisition portion, a motion-correction algorithm is executed, wherein the navigator data of the sub-volume is compared only to corresponding image data in the reference scan, and, if necessary, a motion-correction instruction is generated that is used for the acquisition of the next diagnostic data portion.Type: ApplicationFiled: August 6, 2015Publication date: February 9, 2017Applicant: Siemens Healthcare GmbHInventors: Thomas Beck, Himanshu Bhat
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Publication number: 20170016972Abstract: A magnetic resonance (MR) method and system are provided for generating real-time prospective motion-corrected images using fast navigators. The real-time motion correction is achieved by using a 2D EPI navigator that is obtained using a simultaneous multi-slice blipped-CAIPI technique. The navigator parameters such as field of view, voxel size, and matrix size can be selected to facilitate fast acquisition while providing information sufficient to detect rotational motions on the order of several degrees or more and translational motions on the order of several millimeters or more. The total time interval for obtaining and reconstructing navigator data, registering the navigator image, and providing feedback to correct for detected motion, can be on the order of about 100 ms or less. This prospective motion correction can be used with a wide range of MR imaging techniques where the pulse sequences do not have significant intervals of “dead” time.Type: ApplicationFiled: July 13, 2015Publication date: January 19, 2017Inventors: Himanshu Bhat, Keith Aaron Heberlein, Stephen Farman Cauley, Matthew Dylan Tisdall, Kawin Setsompop, Andre Jan Willem Van Der Kouwe
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Publication number: 20160300353Abstract: A method for automatically and dynamically optimizing image acquisition parameters/commands of an imaging procedure performed by a medical imaging apparatus in order to mitigate or cancel dynamic effects perturbing the image acquisition process of an object to be imaged by the medical imaging apparatus. The method includes connecting a dynamic correction module (DCM) to the medical imaging apparatus, automatically acquiring by the DCM image acquisition parameters/commands and data about dynamic changes or effects, and automatically determining in real time, by the DCM, at least one new image acquisition parameter/command from the image acquisition parameters/commands defined in the imaging control system and the dynamic change data, while the image acquisition parameter/command defined in the imaging control system remains unchanged. The method further includes automatically providing, by the DCM, the new image acquisition parameter/command to the hardware control system.Type: ApplicationFiled: April 7, 2016Publication date: October 13, 2016Inventors: HIMANSHU BHAT, THORSTEN FEIWEIER, TOBIAS KOBER, CARSTEN PRINZ, DANIEL NICO SPLITTHOFF, STEPHAN STOECKER
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Publication number: 20150323634Abstract: A method for accelerated segmented magnetic resonance (MR) image data acquisition includes using a plurality of RF pulses to excite one or more slices of an anatomical area of interest according to a predetermined slice acceleration factor. Next, a collapsed image comprising the slices is acquired using a consecutive segment acquisition process. Then, a parallel image reconstruction method is applied to the collapsed image to separate the collapsed image into a plurality of slice images.Type: ApplicationFiled: May 7, 2014Publication date: November 12, 2015Applicants: Massachusetts General Hospital, Siemens Medical Solutions USA, Inc.Inventors: Jonathan Rizzo Polimeni, Himanshu Bhat, Keith Aaron Heberlein, Kawin Setsompop, Thomas Witzel, Stephen Farman Cauley