General Electric Company

Ge Precision Healthcare LLC

Ge Medical Systems Global Technology Company, LLC

Ajeetkumar Gaddipati

Xiaoli Zhao

Shaorong Chang

Dawei Gui

Robert Donald Peters

Zhiqiang Li

Joseph K Maier

Michael J Radziun

Ali Ersoz

Anton Max Linz

Michael R Hartley

Donglai Huo

Philip James Beatty

Jean Helen Brittain

Ersin Bayram

Reed Frederick Busse

James Hartman Holmes

Mark T Radick

Valentina Taviani

Ken-Pin Hwang

Roshy James Francis

Moran Wei

Xucheng Zhu

Howard Andrew Rowley

Gabriel Fernandez

Zachary W Slavens

Conrad J Dirckx

A magnetic resonance (MR) imaging method of correcting motion in precorrection MR images of a subject is provided. The method includes applying, by an MR system, a pulse sequence having a k-space trajectory of a blade being rotated in k-space. The method also includes acquiring k-space data of a three-dimensional (3D) imaging volume of the subject, the k-space data of the 3D imaging volume corresponding to the precorrection MR images and acquired by the pulse sequence. The method further includes receiving a 3D MR calibration data of a 3D calibration volume, wherein the 3D calibration volume is greater than or equal to the 3D imaging volume, jointly estimating rotation and translation in the precorrection MR images based on the k-space data of the 3D imaging volume and the calibration data, correcting motion in the precorrection images based on the estimated rotation and the estimated translation, and outputting the motion-corrected images.

Motion correction systems and methods of propeller magnetic resonance images

Various methods and systems are provided for acquiring a plurality blades of k-space data for magnetic resonance (MR) data acquisition. The plurality blades are arranged in a rotational manner around a center of the k-space. Each of the blades includes a plurality of parallel phase encoding lines indexed sequentially along a phase encoding direction of the blade. The phase encoding lines of each blade are sampled according to an asymmetric phase encoding order. The blade phase encoding orders of at least two adjacent blades are opposite to each other. This results in reducing shading and blurring artifacts in MRI images.

Methods and systems for reduced shading and blurring in magnetic resonance imaging

Systems and methods for accelerated multi-contrast PROPELLER are disclosed herein. K-space is sampled in a rotating fashion using a plurality of radially directed blades around a center of k-space. A first subset of blades is acquired for a first contrast and a second subset of blades is acquired for a second contrasts. The first subset of blades is combined with high frequency components of the second subset of blades to produce an image of the first contrast. And the second subset of blades are combined with high frequency components of the first subset of blades to produce an image of the second contrast.

Systems and methods for accelerated multi-contrast propeller

A system and method for reducing MRI-generated acoustic noise is disclosed. A system control of an MRI apparatus causes a plurality of gradient coils and an RF coil assembly in the MRI apparatus to generate pulse sequences that each cause an echo train to form and acquire blades of k-space data of the subject of interest from the pulse sequences, with the blades being rotated about a section of k-space compared to every other blade. The system control also causes the plurality of gradient coils to generate gradient pulses in each pulse sequence having an optimized gradient waveform that reduces an acoustic noise level generated thereby and causes the RF coil assembly to generate a 180 degree prep pulse subsequent to generation of an RF excitation pulse and prior to generation of a first RF refocusing pulse, the 180 degree prep pulse minimizing echo spacing in the echo train.

System and method for reducing acoustic noise level in MR imaging

In an embodiment, a method includes performing a magnetic resonance (MR) data acquisition sequence including the acquisition of a plurality of blades of k-space data rotated about a section of k-space. The k-space data is representative of gyromagnetic material within a subject of interest, and each blade includes a plurality of encode lines defining a width of the respective blade. The acquisition of each blade includes receiving MR signal from echoes in two or more separate echo trains to fill at least a portion of the plurality of encode lines, and the echo trains are separated by an excitation pulse.

Multiple excitation blade acquisition for motion correction in magnetic resonance imaging

A method includes the acts of acquiring a blade of k-space calibration data; acquiring a set of T1-weighted k-space imaging data, the set of T1-weighted k-space imaging data having blades of undersampled k-space data rotated about a section of k-space. Each blade of undersampled k-space data includes first data points having acquired data and second data points that are missing data. The method also includes generating a set of reconstruction weights for the blades of undersampled k-space data using the blade of k-space calibration data; synthesizing k-space data for at least a portion of the second data points using the set of reconstruction weights; and generating a T1-weighted image using the T1-weighted k-space imaging data and the synthesized k-space data.

Motion correction in accelerated T1-weighted magnetic resonance imaging

A computer readable storage medium has stored thereon a computer program having instructions, which, when executed by a computer, cause the computer to apply a first plurality of RF pulses during a first TR interval of an MR pulse sequence to generate a first echo train. A plurality of echoes of the first echo train are split into a plurality of echo pairs. Within a first echo space, first and second gradient pulses are applied during respective first and second generated echoes, and respective first and second sets of k-space data are acquired that correspond to respective first and second blades of k-space data in the same k-space. The first and second blades have orientations at different angles from one another. The instructions further cause the computer to reconstruct an image based on the acquired first and second sets of k-space data.

System and method for split-echo split-blade data collection for propeller magnetic resonance imaging

An apparatus and method of MR imaging is disclosed. The apparatus and method comprises segmenting acquisition of an echo train into separate odd and even acquisition blades in k-space, wherein the odd and even acquisition blades extend orthogonally through a common reference point in a central region of k-space. A segment of MR data is acquired using a quadratic phase modulation scheme, wherein a first set of MR echo signals occurring after odd-numbered RF refocusing pulses are stored in the odd acquisition blade, and a second set of MR echo signals occurring after even-numbered RF refocusing pulses are stored in the even acquisition blade. This acquisition and segmentation is repeated until a sufficient number of blades are acquired to fill k-space. Finally, an image is reconstructed from the acquisition blades.

Apparatus and method for acquisition and reconstruction of non-CPMG propeller sequences

A method and apparatus for reducing vibration-related artifacts in diffusion weighted imaging determines a vibrational frequency of an MR system and modifies scan parameters such that vibrational frequencies induced on the MR system are inconsistent with the vibrational frequency of the MR system. The method and apparatus improves image quality of MR images acquired using diffusion weighted imaging techniques with the MR system. As such, modification and/or redesign of the MR system to reduce vibrational frequency interaction is reduced.

Method and apparatus for vibration-related artifact reduction

A system and method of MR imaging enables PROPELLER imaging to be feasibly carried out independently of slice orientation or anatomy of interest. The invention is directed to accelerated acquisition of blades of MR data that are rotated about a central region of k-space and reconstructing an image of arbitrary slice orientation from the blades of MR data that preserves contrast and reduces acceleration artifacts caused by signal amplitude variances.

System and method of accelerated MR propeller imaging

A method and system of MR imaging is disclosed that enables PROPELLER imaging to be feasibly carried out independently of slice orientation or anatomy of interest. The invention is directed to the acquisition of blades of MR data that are rotated about a central region of k-space and reconstructing an image of arbitrary slice orientation from the blades of MR data that is substantially absent of radial ripple artifacts caused by phase aliasing from tissue outside the field of view in the slice plane.

Method and system of MR imaging with reduced radial ripple artifacts

A sequence description defining the events for traversing k-space during a medical imaging scan is defined through a k-space graphical view, thereby providing an easy programming interface for MR physicists. From the k-space view, data elements can be generated by object-oriented sequence description components in the form of predefined sequences. The data elements generated by the predefined sequences are stored in a table, the lines in the table defining an ordered list of pulse segments associated with each trajectory in k-space, the table can also hold information on time ordering or sequencing of k-space trajectories, desired triggering for each k-space trajectory and similar data objects. The k-space description/configuration of sequences is then translated to a group of downloadable sequence components.

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Waukesha, WI, United States of America

Ajeetkumar Gaddipati