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Real-time prospective motion correction for MR imaging

A motion correction and imaging technology, which can be used in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic variable measurement, and magnetic variable measurement, which can solve the problems of incompatibility and inaccuracy of imaging technology.

Active Publication Date: 2017-04-19
SIEMENS MEDICAL SOLUTIONS USA INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such marker-based approaches may require additional and / or specialized equipment, and may be incompatible with certain imaging techniques and / or be less accurate because the markers may be located in the same position as the image being imaged. Focus on volumes at a certain distance from each other

Method used

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  • Real-time prospective motion correction for MR imaging
  • Real-time prospective motion correction for MR imaging
  • Real-time prospective motion correction for MR imaging

Examples

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example 1

[0067] To demonstrate the accuracy of the forward motion correction system and method described herein, 2D SMSEPI navigator images of two human subjects were acquired. Each subject was asked to calibrate their head to twelve different positions and orientations (relative to a specific starting position) during the imaging procedure. Images were acquired using a 3T MAGNETOM® Skyra scanner (Siemens Healthcare GmbH, Erlangen, Germany). The following parameters were used to image these navigators: FOV: 256×256×80mm 3 ; Spatial resolution: 8 × 8 × 8 mm3 (for a voxel matrix size of 32 × 32 × 10, e.g. 10 slices 8 mm thick); flip angle of 10°; two-shot SMS, where each shot is simultaneously excited 5 slices (SMS-5); and relative offset between slices for FOV / 4 of the logo-CAIPI technique.

[0068] The acquisition time for each slice group consisting of 5 slices was 14 ms, resulting in a total acquisition time of 28 ms for the entire navigator volume (two shots per 5 slices).

[006...

example 2

[0073] To provide an indication of the range of motion identifiable during MR imaging using the forward motion correction system and method described herein, five healthy volunteers were scanned using a 2.5-minute long SMS Navigator sequence in which During the navigator sequence, five subjects were instructed to move their heads freely. Navigator parameters are the same as those used in example 1 above, namely: images were acquired using a 3T MAGNETOM® Skyra scanner (Siemens Medical GmbH, Erlangen, Germany); FOV: 256×256×80mm 3 ; spatial resolution: 8 × 8 × 8 mm3 (voxel matrix size of 32 × 32 × 10, e.g. 10 slices of 8 mm thickness); flip angle of 10°; two shots of SMS, each of which stimulates 5 slices (SMS-5); and the relative offset between slices for FOV / 4 of the sign-CAIPI technique.

[0074] Navigator images were retrospectively registered to derive the range of motion estimates within which SMS navigation is expected to function correctly. The range of motion derived ...

example 3

[0083] To demonstrate the effectiveness of the forward motion correction system and method described herein for MR imaging procedures, a fast acquisition was prepared with conventional magnetization using a 3T MAGNETOM® Skyra scanner (Siemens Medical GmbH, Erlangen, Germany) with a 32-channel receive coil. Gradient echo (MPRAGE) sequence to image both subjects. The parameters used for the MPRAGE scan were: Spatial resolution: 1 × 1 × 1 mm 3 ; GRAPPA acceleration factor: 3; Total scan time: 4 minutes.

[0084] The 2D SMS EPI navigator according to an embodiment of the present disclosure is inserted into the TI gap of the MPRAGE sequence. The following parameters were used for the navigator acquired during the MPRAGE sequence: FOV: 256×256×80mm 3 ;Spatial resolution: 8×8×8mm 3 (voxel matrix size of 32×32×10); flip angle of 10°; two-shot SMS, where each shot simultaneously excites 5 slices (SMS-5); and FOV / 4 for logo-CAIPI technique The relative offset between the slices.

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Abstract

The invention relates to quick prospective motion correction for MR imaging. 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.

Description

[0001] Statement Regarding Federally Funded Research [0002] This invention was made with government support under grants R21AG046657 and R00EB012107 awarded by the NIH. The Government has certain rights in this invention. technical field [0003] The present disclosure relates to methods and systems for generating magnetic resonance (MR) images, and in particular, to methods and systems for generating magnetic resonance images with fast forward motion correction that can be used with various MR used with imaging techniques. Background technique [0004] Magnetic resonance (MR) imaging is a known technique that can produce images for examining the interior of a subject without radiation exposure. During a typical MR imaging procedure, the subject is positioned in the MR apparatus in a strong, static, uniform base magnetic field B0 (with a field strength typically between about 0.5 Tesla and 3 Tesla), The nuclear spins of the host become oriented along the base magnetic f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/565
CPCG01R33/56509G01R33/54G01R33/5602G01R33/5616G01R33/5617G01R33/56341G01R33/56366G01R33/5676G01R33/5611
Inventor H.巴特S.F.考利K.A.赫伯莱茵K.塞特索姆波普M.D.蒂斯达尔A.J.W.范德库韦
Owner SIEMENS MEDICAL SOLUTIONS USA INC