The General Hospital Corporation

Siemens Healthcare Gmbh

The United States of America, as Represented by the Secretary, Department of Health and Human Services

Siemens Healthineers Ag

Thomas Witzel

Lawrence Leroy Wald

Kawin Setsompop

Jonathan R Polimeni

Keith Aaron Heberlein

Bruce R Rosen

Himanshu Bhat

Stephen Farman Cauley

William Allyn Grissom

Berkin Bilgic

Avery J L Berman

Described here are systems and methods for producing images with a magnetic resonance imaging ('MRI') system using a high-resolution, motion-robust, artifact-free segmented echo planar imaging (“EPI”) technique. In particular, a fast low angle excitation echo planar imaging technique (“FLEET”) using variable flip angle (“VFA”) radio frequency (“RF”) excitation pulses that are recursively designed to have a flat magnitude and phase profile across a slice for a range of different flip angles by accounting for longitudinal magnetization remaining after each preceding RF pulse is applied.

Multi-shot echo planar imaging using reordered segments and recursive radio frequency pulse design giving matched slice profiles across segments

A method is proposed for recording diagnostic measurement data of a head of an examination object in head imaging via a magnetic resonance device. The method comprises performing an overview scan of the head of the examination object, wherein overview measurement data is acquired in the overview scan and performing various diagnostic scans of the head of the examination object based on the acquired overview measurement data, wherein diagnostic measurement data is acquired in the various diagnostic scans.

Method for recording diagnostic measurement data of a head of an examination object in head imaging via a magnetic resonance device

Systems and methods for simultaneously acquiring high-resolution images of a subject from multiple different slice locations using magnetic resonance imaging ('MRI') are described. The present invention overcomes the aforementioned drawbacks by providing method for producing a plurality of images of a subject with a magnetic resonance imaging ('MRI') system. A radio frequency (RF) excitation field is applied by the MRI system to a portion of a subject that includes a plurality of slice locations. First data are simultaneously acquired from each of the plurality of slice locations by the MRI system.

Systems and methods for slice dithered enhanced resolution simultaneous multislice magnetic resonance imaging

Described here are systems and methods for producing images with a magnetic resonance imaging ('MRI') system using a high-resolution, motion-robust, artifact-free segmented echo planar imaging ('EPI') technique. In particular, a fast low angle excitation echo planar imaging technique (&#x201c;FLEET&#x201d;) using variable flip angle (&#x201c;VFA&#x201d;) radio frequency (&#x201c;RF&#x201d;) excitation pulses that are specifically designed to have a flat magnitude and phase profile across a slice for a range of different flip angles.

Multi-shot echo planar imaging using reordered segments and RF excitation pulse phase and slice profiles matched across interleaves

Spin-lock T-weighted images of a subject are acquired and processed to produce an image that is indicative of bioelectromagnetic activity in the subject. A spin-lock RF field Bis produced such that the Larmor frequency in the rotating frame corresponds to the expected frequency of the bioelectromagnetic activity. As a result, the magnetic field fluctuations generated by the bioelectromagnetic currents shorten the Tof the surrounding tissue, creating a contrast mechanism that is seen as a reduced MR signal in the T-weighted image that is produced.

Stimulus induced rotary saturation for magnetic resonance functional imaging

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.

Methods, systems and apparatuses for rapid segmented, accelerated, and simultaneous multi-slice echo planar imaging

A method and system for producing an image of a subject with a magnetic resonance imaging (MRI) system, in which the presence of a contrast agent is detected using a spin-lock pulse sequence, is described. More specifically, a contrast agent that induces saturation of magnetic resonance signals responsive to a spin-lock condition is administered to a subject. A spin-lock condition is subsequently established to saturate spins in proximity to the contrast agent. Image data is then acquired with an imaging pulse sequence and images indicative of the presence of the contrast agent are reconstructed.

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Thomas Witzel