-
公开(公告)号：US20210097738A1
公开(公告)日：2021-04-01
申请号：US16583596
申请日：2019-09-26
申请人： Siemens Healthcare GmbH , THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY, DEPT. OF HEALTH AND HUMAN SERVICES
发明人： Waqas Majeed , Sunil Goraksha Patil , Rainer Schneider , Himanshu Bhat , Adrienne Campbell-Washburn
摘要： A method for decomposing noise into white and spatially correlated components during MR thermometry imaging includes acquiring a series of MR images of an anatomical object and generating a series of temperature difference maps of the anatomical object. The method further includes receiving a selection of a region of interest (ROI) within the temperature difference map and estimating total noise variance values depicting total noise variance in the temperature difference map. Each total noise variance value is determined using a random sampling of a pre-determined number of voxels from the ROI. A white noise component and a spatially correlated noise component of the total noise variance providing a best fit to the total noise variance values for all of the random samplings are identified. The white noise component and the spatially correlated noise component are displayed on a user interface.
-
公开(公告)号：US10517490B2
公开(公告)日：2019-12-31
申请号：US15332107
申请日：2016-10-24
IPC分类号： A61B5/026 , G01R33/563 , G01R33/56 , G01R33/483 , A61B5/00
摘要： A method for producing an image representative of the vasculature of a subject using a MRI system includes the acquisition of a signal indicative of a subject' cardiac phase. During each heartbeat of the subject, image slices of a volume covering a region of interest (ROI) within the subject are acquired by applying a volume-selective venous suppression pulse to suppress (a) venous signal for an upper slice in the ROI; (b) venous signal for slices that are upstream for venous flow in the ROI; and (c) background signal from the upstream slices. Next, a slice-selective background suppression pulse is applied to suppress background signal of the upper slice. Following a quiescent time interval, a spectrally selective fat suppression pulse is applied to the entire volume to attenuate signal from background fat signal. Then, a simultaneous multi-slice acquisition of the upper slice and the upstream slices is performed.
-
公开(公告)号：US09945923B2
公开(公告)日：2018-04-17
申请号：US14819709
申请日：2015-08-06
发明人： Thomas Beck , Himanshu Bhat
IPC分类号： G01R33/565 , G01R33/483
CPC分类号： G01R33/56509 , G01R33/4835
摘要： 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.
-
公开(公告)号：US11301997B2
公开(公告)日：2022-04-12
申请号：US16849313
申请日：2020-04-15
申请人： Siemens Healthcare GmbH , THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY, DEPARTMENT OF HEALTH AND HUMAN SERVICES
摘要： A method for phase correction in proton resonance frequency (PRF) thermometry application includes acquiring a series of magnetic resonance (MR) images comprising a first MR image and plurality of subsequent MR images depicting an anatomical area of interest. The MR images are acquired while tissue in the anatomical area of interest is undergoing a temperature change. Each subsequent MR image is registered to the first MR image to yield a plurality of registered images. A plurality of basis images are computed from the registered images using Principal Component Analysis (PCA). The basis images are used to remove motion-related phase changes from a second series of MR images, thereby yielding a motion corrected second series of MR images. One or more temperature difference maps are generated that depict a relative temperature change for the tissue in the anatomical area of interest based on the motion corrected second series.
-
5.发明授权公开(公告)号：US10310040B2
公开(公告)日：2019-06-04
申请号：US15221635
申请日：2016-07-28
IPC分类号： G01R33/56 , G01R33/483 , G01R33/561
摘要： 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.
-
公开(公告)号：US10126394B2
公开(公告)日：2018-11-13
申请号：US14994685
申请日：2016-01-13
发明人： Thomas Beck , Himanshu Bhat , Uvo Hoelscher , Mario Zeller
IPC分类号： G01V3/00 , G01R33/483 , G01R33/561
摘要： 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.
-
公开(公告)号：US09940713B1
公开(公告)日：2018-04-10
申请号：US15351471
申请日：2016-11-15
发明人： Himanshu Bhat , Keith Aaron Heberlein , Thomas Beck , Martin Harder , Andre Jan Willem Van Der Kouwe , Matthew Dylan Tisdall
IPC分类号： G06T7/00 , A61B5/055 , G01R33/565 , G01R33/3875 , G06T7/70 , A61B5/00
CPC分类号： A61B5/0037 , A61B5/0402 , A61B5/055 , A61B5/7207 , A61B5/721 , A61B5/7289 , G01R33/3875 , G01R33/4835 , G01R33/56509 , G01R33/5676 , G06T7/70 , G06T2207/30204
摘要： A method for MRI inter-scan motion correction includes performing (i) an anatomical localizer scan of a region of interest (ROI) to identify anatomical landmarks defining orientation of a surrounding field-of-view (FOV); (ii) an inter-scan motion reference scan of the ROI to acquire a reference inter-scan dataset indicating a reference navigator location in the ROI; and (iii) scans of the ROI to acquire k-space data. Prior to one or more of the scans, a motion correction process is performed that includes (a) performing an inter-scan motion tracking scan to acquire a tracking inter-scan dataset indicating an updated reference navigator location; (b) determining an estimation of inter-scan patient motion based on a comparison between the reference inter-scan and tracking inter-scan datasets; and (c) updating the FOV relative to the landmarks based on that estimation. Images of the ROI may be generated using the k-space data acquired with each of the scans.
-
公开(公告)号：US20180074147A1
公开(公告)日：2018-03-15
申请号：US15262233
申请日：2016-09-12
发明人： Flavio Carinci , Dominik Paul , Himanshu Bhat , Mario Zeller
IPC分类号： G01R33/483 , G01R33/561 , G01R33/385
CPC分类号： G01R33/4835 , G01R33/3852 , G01R33/5611 , G01R33/5617
摘要： 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.
-
9.发明申请公开(公告)号：US20180024214A1
公开(公告)日：2018-01-25
申请号：US15218388
申请日：2016-07-25
发明人： Himanshu Bhat , Mario Zeller
IPC分类号： G01R33/48 , G01R33/561
CPC分类号： G01R33/4828 , G01R33/4835 , G01R33/5611 , G01R33/5617
摘要： 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.
-
10.发明申请公开(公告)号：US20170293010A1
公开(公告)日：2017-10-12
申请号：US15093164
申请日：2016-04-07
IPC分类号： G01R33/561 , A61B5/00 , A61B5/055 , G01R33/54 , G01R33/36
CPC分类号： G01R33/5611 , A61B5/0042 , A61B5/055 , A61B2560/0223 , G01R33/4835
摘要： 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.
-
-
-
-
-
-
-
-
-
搜索结果
44 条记录 (耗时 0.019 秒)
