Northshore University Healthsystem

Siemens Healthcare Gmbh

National Institutes of Health, a Component of the US Dept. of Health & Human Services

Siemens Medical Solutions Usa, Inc.

Siemens Healthineers Ag

The United States of America As Represented by the National Institutes of Health (nih)

Ioannis Koktzoglou

Robert R Edelman

Shivraman Giri

Himanshu Bhat

Christopher Glielmi

Jianing Pang

Erik J Offerman

Federico E Mordini

A system and method for a non-contrast enhanced magnetic resonance imaging technique using a temporal maximum intensity projection reconstructed from multiple temporal subsets of data acquired the acquisition window. The method includes applying a radiofrequency pulse to the subject, waiting a quiescent interval, performing a radial acquisition with a golden-angle view angle increment over a duration corresponding to a cardiac cycle of the subject to generate acquisition data, reconstructing a plurality of images across a plurality of temporal phases from the acquisition data and generating a temporal maximum intensity projection image by tracking an intensity of each pixel across the plurality of images and selecting the pixel having a maximum intensity value across the plurality of images.

Ungated non-contrast enhanced magnetic resonance angiography using multiple subset reconstruction and temporal maximum intensity projection

A method for generating magnetic resonance images of a subject includes performing, using a magnetic resonance imaging (MRI) system, an interrupted three-dimensional (3D) single shot unbalanced steady-state free precession (uSSFP) pulse sequence to acquire MR data for each of a plurality of partitions associated with a region of interest of a subject. The interrupted 3D single shot uSSFP pulse sequence may be configured to suppress blood signal in the region of interest. The MR data for each partition is acquired as a single shot along an in-plane phase-encoding direction and the acquisition of MR data for each partition is synchronized to a phase of a cardiac cycle. The method further includes generating, using a processor, an image with blood suppression based on the acquired MR data.

System and method for three-dimensional (3D) unbalanced steady-state free precession magnetic resonance imaging

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.

Data acquisition acceleration in magnetic resonance angiography applications using magnetization-prepared simultaneous multi-slice acquisition

A system and method for controlling a magnetic resonance imaging (MRI) system to create magnetic resonance (MR) cine angiograms of a subject. The method includes controlling the MRI system to acquire MR data from the subject by performing at least one cine acquisition pulse sequence having a plurality of acquisition RF pulse modules applied at constant intervals throughout a cardiac cycle, and at least one labeling pulse sequence including a first and a second &#x3b1;/2 module and a labeling RF pulse module for labeling a region of inflowing arterial flow through a vessel of interest. The method further includes reconstructing the MR data to form a series of cine frames that form a cine angiogram, subtracting at least one cine frame from other cine frames reconstructed from the MR data, and displaying the MR cine angiogram of the vessel of interest.

System and method for semi-projective quantitative flow imaging using accelerated arterial spin-labeled cine MRI

A system and method for controlling a magnetic resonance imaging (MRI) system to create magnetic resonance (MR) angiograms of a subject. The method includes controlling the MRI system to acquire MR data by performing a pulse sequence that includes at least one set of modules formed by a first &#x3b1;/2 module, a (readout, &#x3b1;)n module, a second &#x3b1;/2 module. In this case, &#x3b1; denotes a radiofrequency (RF) flip angle and n denotes a number of times that the set of modules is repeated. The method also includes reconstructing an MR angiogram of the subject from the MR data.

System and method for fast interrupted steady-state (FISS) MRI

A system and method is provided for magnetic resonance angiography (MRA) that includes applying a first labeling pulse sequence to a first labeling region having a first portion of a vasculature of a subject extending through the first labeling region to label spins moving within the first labeling region. A second labeling pulse sequence is applied to a second labeling region having a second portion of a vasculature of the subject extending through the second labeling region to label spins moving within the second labeling region. The first and second labeling pulse sequences include different labeling techniques. An imaging pulse sequence is applied to an imaging region having a third portion of a vasculature of the subject extending through the imaging region that is displaced from the first and second labeling region to acquire imaging data from the spins labeled by the first labeling pulse sequence and the second labeling pulse sequence. An MRA image is reconstructed of at least the third portion of the vasculature of the subject from the medical imaging data.

System and method for hybrid radiofrequency labeling for magnetic resonance imaging

Systems and methods for acquiring magnetic resonance images that accurately depict vascular calcifications, or other objects composed of magnetic susceptibility-shifted substances, in a subject are provided. The images are generally acquired using a pulse sequence that is designed to reduce physiological motion-induced artifacts and to mitigate chemical-shift artifacts from water-fat boundaries. Advantageously, the MRI technique described here suppresses chemical-shift artifacts without significantly reducing the signal intensity from fatty tissues, and thereby allows for more reliable visualization of vascular calcifications.

Systems and methods for imaging vascular calcifications with magnetic resonance imaging

Systems and methods for magnetic resonance imaging ('MRI'), in which accurate and conspicuous visualization of vascular calcifications and other bony structures can be achieved. An MRI system is operated to perform a pulse sequence that generates substantially similar signal intensity from soft tissues (e.g. muscle, fat, blood) within the body. For instance, blood can be rendered to have a signal intensity that is substantially similar to the vessel wall, while fat and muscle are rendered to appear substantially similar to the vessel wall. With this 'neutral' contrast, arterial calcifications, which appear dark due to their low proton density, can be more readily and efficiently visualized by an interpreting physician.

System and method for neutral contrast magnetic resonance imaging of calcifications

Embodiments relate to a method and system to improve fat suppression and reduce motion and off-resonance artifacts in magnetic resonance imaging (MRI) by using a background-suppressed, reduced field-of-view (FOV) radial imaging. The reduction of such artifacts provides improved diagnostic image quality, higher throughput of MRI scans for the imaging center, and increased patient comfort. By using a small FOV radial acquisition that only encompasses the structures of interest, structures that cause motion artifacts, such as the anterior abdominal wall, bowel loops, or blood vessels with pulsatile flow, are excluded from the image. According to an embodiment, combining a small FOV radial acquisition with one or more background-suppression techniques minimizes the impact of artifacts caused by anatomy outside of the FOV.

Background-suppressed, reduced field-of-view radial magnetic resonance imaging

Systems and methods for designing a data acquisition scheme to be used in magnetic resonance imaging ('MRI') are provided. In particular, the systems and methods include designing efficient, or otherwise optimized, azimuthal equidistant projections for radially sampling k-space. This sampling pattern resulting from this data acquisition scheme minimizes image artifacts, including those attributable to eddy currents. The data acquisition scheme can be computed rapidly and automatically and, thus, is fit for routine use in clinical MRI systems.

Systems and methods for efficient radial magnetic resonance imaging with azimuthal equidistant projections

A magnetic resonance method and system are provided for projection MR imaging of vascular structures within a subject, with scan times that are shorter than those needed for conventional techniques. Image acquisition sequences are synchronized with heartbeat cycles of the subject, and are configured to generate image data having a reduced spatial resolution in the projection direction perpendicular to a preselected projection plane. A reduction factor F quantifies this reduced resolution, such that the number of data acquisition sequences provided within each heartbeat cycle is F times as many as a comparable imaging protocol that generates full-resolution data. The total scan time can be reduced by a factor of F with negligible degradation in the projection image quality.

System and method for accelerated angiographic magnetic resonance imaging

A system and method is provided that includes a) monitoring a cardiac cycle of the subject to identify a predetermined point and, b) upon identifying the predetermined point, performing the steps of i) performing at least one of a desired number of magnetization suppressing preparations to suppress signal from blood flow through at least the region of interest, ii) acquiring a first set of imaging data from the region of interest, and iii) repeating step i) and step ii) to acquire at least a second set of imaging data from the region of interest. The method further includes c) repeating step b) a predetermined number of times over a series of cardiac cycles to acquire respective sets of medical imaging data of the region of interest and d) reconstructing first set of imaging data and the second set of imaging data into a time-resolved series of images.

System and method for imaging of the vascular components with temporal information and suppressed blood pools using magnetic resonance imaging

A system and method is provided for acquiring a medical image of a portion of a vascular structure of a subject using a magnetic resonance imaging (MRI) system. At least one radio frequency (RF) saturation pulse is applied to a selected region of a subject that is free of exogenous contrast agents using the MRI system to saturate spins of all tissues within the selected region. A delay time is selected to allow an inflow of unsaturated vascular spins that are free of influence from exogenous contrast agent into the selected region through vascular structures within the selected region. A sparse dataset is formed from a series of spatially-encoded views from the selected region using an undersampled radial k-space trajectory in which the center of k-space is sampled for each view in the series of spatially-encoded views. An image of the vascular structures within the selected region is reconstructed from the sparse dataset.

System and method for imaging of vascular structures using non-contrast enhanced magnetic resonance imaging

A system and method for producing an image of a vasculature of a subject using a magnetic resonance imaging (MRI) system includes applying a saturation pulse to a prescribed imaging slice to substantially suppress MR signals in the prescribed imaging slice. A quiescent inflow time period (QITP) is observed that is at least equal to half a projected duration of a cardiac cycle of the subject. After the QITP, k-space data is acquired from the prescribed imaging slice, and a subset of the data representative of a desired portion of the cardiac cycle of the subject is reconstructed into an image of the subject including at least the prescribed imaging slice.

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Des Plaines, IL, United States of America

Ioannis Koktzoglou