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Items from 1 to 18 out of 18 results

article

Three‐dimensional reduced field‐of‐view imaging (3D‐rFOVI)

Kaibao Sun, Zheng Zhong, Guangyu Dan, Muge Karaman, more

Magnetic Resonance in Medicine > 87 > 5 > 2372 - 2379

Purpose This study aimed at developing a 3D reduced field‐of‐view imaging (3D‐rFOVI) technique using a 2D radiofrequency (RF) pulse, and demonstrating its ability to achieve isotropic high spatial resolution and reduced image distortion in echo planar imaging (EPI). Methods The proposed 3D‐rFOVI technique takes advantage of a 2D RF pulse to excite a slab along the conventional slice‐selection direction...

article

In‐plane simultaneous multisegment imaging using a 2D RF pulse

Kaibao Sun, Zheng Zhong, Zhongbiao Xu, Guangyu Dan, more

Magnetic Resonance in Medicine > 87 > 1 > 263 - 271

Purpose To develop an in‐plane simultaneous multisegment (IP‐SMS) imaging technique using a 2D‐RF pulse and to demonstrate its ability to achieve high spatial resolution in EPI while reducing image distortion. Methods The proposed IP‐SMS technique takes advantage of periodic replicates of the excitation profile of a 2D‐RF pulse to simultaneously excite multiple segments within a slice. These segments...

article

Local excitation universal parallel transmit pulses at 9.4T

Ole Geldschläger, Dario Bosch, Steffen Glaser, Anke Henning

Magnetic Resonance in Medicine > 86 > 5 > 2589 - 2603

Purpose To demonstrate that the concept of “universal pTx pulses” is applicable to local excitation applications. Methods A database of B₀/

B_{1}^{+}

maps from eight different subjects was acquired at 9.4T. Based on these maps, universal pulses that aim at local excitation of the visual cortex area in the human brain (with a flip angle of 90° or 7°) were calculated. The remaining brain regions should...

article

Correction of Artifacts Induced by B₀ Inhomogeneities in Breast MRI Using Reduced‐Field‐of‐View Echo‐Planar Imaging and Enhanced Reversed Polarity Gradient Method

Ana E. Rodríguez‐Soto, Lauren K. Fang, Dominic Holland, Jingjing Zou, more

Journal of Magnetic Resonance Imaging > 53 > 5 > 1581 - 1591

Background Diffusion‐weighted (DW) echo‐planar imaging (EPI) is prone to geometric distortions due to B₀ inhomogeneities. Both prospective and retrospective approaches have been developed to decrease and correct such distortions. Purpose The purpose of this work was to evaluate the performance of reduced‐field‐of‐view (FOV) acquisition and retrospective distortion correction methods in decreasing...

article

4D flow imaging with UNFOLD in a reduced FOV

Clarissa Wink, Jean Pierre Bassenge, Giulio Ferrazzi, Tobias Schaeffter, more

Magnetic Resonance in Medicine > 84 > 1 > 327 - 338

Purpose Two‐dimensional selective excitation (2DRF) allows shortening 4D flow scan times by reducing the FOV, but the longer 2DRF pulse duration decreases the temporal resolution, yielding underestimated peak flow values. Multiple k‐space lines per cardiac phase, n_l ≥ 2, are commonly applied in 4D flow MRI to shorten the inherent long scan times. We demonstrate that 2DRF 4D flow with n_l ≥ 2 can be...

article

4D flow imaging with 2D‐selective excitation

Clarissa Wink, Giulio Ferrazzi, Jean Pierre Bassenge, Sebastian Flassbeck, more

Magnetic Resonance in Medicine > 82 > 3 > 886 - 900

Purpose 4D flow MRI permits to quantify non‐invasively time‐dependent velocity vector fields, but it demands long acquisition times. 2D‐selective excitation allows to accelerate the acquisition by reducing the FOV in both phase encoding directions. In this study, we investigate 2D‐selective excitation with reduced FOV imaging for fast 4D flow imaging while obtaining correct velocity quantification...

article

Dynamic per slice shimming for simultaneous brain and spinal cord fMRI

Haisam Islam, Christine S. W. Law, Kenneth A. Weber, Sean C. Mackey, more

Magnetic Resonance in Medicine > 81 > 2 > 825 - 838

Purpose Simultaneous brain and spinal cord functional MRI is emerging as a new tool to study the central nervous system but is challenging. Poor B₀ homogeneity and small size of the spinal cord are principal obstacles to this nascent technology. Here we extend a dynamic shimming approach, first posed by Finsterbusch, by shimming per slice for both the brain and spinal cord. Methods We shim dynamically...

article

Cardiac MR elastography using reduced‐FOV, single‐shot, spin‐echo EPI

Yi Sui, Shivaram P. Arunachalam, Arvin Arani, Joshua D. Trzasko, more

Magnetic Resonance in Medicine > 80 > 1 > 231 - 238

Purpose To implement a reduced field of view (rFOV) technique for cardiac MR elastography (MRE) and to demonstrate the improvement in image quality of both magnitude images and post‐processed MRE stiffness maps compared to the conventional full field of view (full‐FOV) acquisition. Methods With Institutional Review Board approval, 17 healthy volunteers underwent both full‐FOV and rFOV cardiac MRE...

article

Fast and reproducible in vivo T₁ mapping of the human cervical spinal cord

Marco Battiston, Torben Schneider, Ferran Prados, Francesco Grussu, more

Magnetic Resonance in Medicine > 79 > 4 > 2142 - 2148

Purpose To develop a fast and robust method for measuring T₁ in the whole cervical spinal cord in vivo, and to assess its reproducibility. Methods A spatially nonselective adiabatic inversion pulse is combined with zonally oblique‐magnified multislice echo‐planar imaging to produce a reduced field‐of‐view inversion‐recovery echo‐planar imaging protocol. Multi‐ inversion time data are obtained by...

article

Two‐dimensional single‐shot diffusion‐weighted stimulated EPI with reduced FOV for ultrahigh‐b radial diffusion‐weighted imaging of spinal cord

Nabraj Sapkota, Xianfeng Shi, Lubdha M. Shah, Erica F. Bisson, more

Magnetic Resonance in Medicine > 77 > 6 > 2167 - 2173

Purpose High‐resolution diffusion‐weighted imaging (DWI) of the spinal cord (SC) is problematic because of the small cross‐section of the SC and the large field inhomogeneity. Obtaining the ultrahigh‐b DWI poses a further challenge. The purpose of the study was to design and validate two‐dimensional (2D) single‐shot diffusion‐weighted stimulated echo planar imaging with reduced field of view (2D...

article

Reduced field of view imaging using a static second‐order gradient for functional MRI applications

Haisam Islam, Gary H. Glover

Magnetic Resonance in Medicine > 75 > 2 > 817 - 822

Purpose Imaging using reduced FOV excitation allows higher resolution or signal‐to‐noise ratio (SNR) per scan time but often requires long radiofrequency pulses. The goal of this study was to improve a recent reduced field of view (FOV) method that uses a second‐order shim gradient to decrease pulse length and evaluate its use in functional MRI (fMRI) applications. Theory and Methods The method,...

article

Feasibility and evaluation of dual-source transmit 3D imaging of the orbits: Comparison to high-resolution conventional MRI at 3T

Achim Seeger, Maximilian Schulze, Frank Schuettauf, Uwe Klose, more

European Journal of Radiology > 2015 > 84 > 6 > 1150-1158

To prospectively compare the image quality and diagnostic performance of orbital MR images obtained by using a dual-source parallel transmission (pTX) 3D sequence (Sampling Perfection with Application optimized Contrasts using different flip angle Evolution, SPACE) with the image quality of conventional high-resolution standard protocol for clinical use in patients at 3T.After obtaining institutional...

article

Reduced-FOV excitation decreases susceptibility artifact in diffusion-weighted MRI with endorectal coil for prostate cancer detection

Natalie Korn, John Kurhanewicz, Suchandrima Banerjee, Olga Starobinets, more

Magnetic Resonance Imaging > 2015 > 33 > 1 > 56-62

The purposes of this study were to determine if image distortion is less in prostate MR apparent diffusion coefficient (ADC) maps generated from a reduced-field-of-view (rFOV) diffusion-weighted-imaging (DWI) technique than from a conventional DWI sequence (CONV), and to determine if the rFOV ADC tumor contrast is as high as or better than that of the CONV sequence. Fifty patients underwent a 3T MRI...

article

Reliable chemical exchange saturation transfer imaging of human lumbar intervertebral discs using reduced‐field‐of‐view turbo spin echo at 3.0 T

Qi Liu, Ning Jin, Zhaoyang Fan, Yutaka Natsuaki, more

NMR in Biomedicine > 26 > 12 > 1672 - 1679

The reduced field‐of‐view (rFOV) turbo‐spin‐echo (TSE) technique, which effectively suppresses bowel movement artifacts, is developed for the purpose of chemical exchange saturation transfer (CEST) imaging of the intervertebral disc (IVD) in vivo. Attempts to quantify IVD CEST signals in a clinical setting require high reliability and accuracy, which is often compromised in the conventionally used...

article

Localized high-resolution DTI of the human midbrain using single-shot EPI, parallel imaging, and outer-volume suppression at 7T

Christopher J. Wargo, John C. Gore

Magnetic Resonance Imaging > 2013 > 31 > 6 > 810-819

Localized high-resolution diffusion tensor images (DTI) from the midbrain were obtained using reduced field-of-view (rFOV) methods combined with SENSE parallel imaging and single-shot echo planar (EPI) acquisitions at 7T. This combination aimed to diminish sensitivities of DTI to motion, susceptibility variations, and EPI artifacts at ultra-high field. Outer-volume suppression (OVS) was applied in...

article

Improved in vivo diffusion tensor imaging of human cervical spinal cord

Junqian Xu, Joshua S. Shimony, Eric C. Klawiter, Abraham Z. Snyder, more

NeuroImage > 2013 > 67 > Complete > 64-76

We describe a cardiac gated high in-plane resolution axial human cervical spinal cord diffusion tensor imaging (DTI) protocol. Multiple steps were taken to optimize both image acquisition and image processing. The former includes slice-by-slice cardiac triggering and individually tiltable slices. The latter includes (i) iterative 2D retrospective motion correction, (ii) image intensity outlier detection...

article

Targeted radiofrequency field mapping using 3D reduced field-of-view-catalyzed double-angle method

Dingxin Wang, Sven Zuehlsdorff, Reed A. Omary, Andrew C. Larson

Magnetic Resonance Imaging > 2011 > 29 > 8 > 1131-1137

The aim of this study was to develop a targeted volumetric radiofrequency field (B ₁ ⁺ ) mapping technique to provide region-of-interest B ₁ ⁺ information.Targeted B ₁ ⁺ maps were acquired using three-dimensional (3D) reduced field-of-view (FOV) inner-volume turbo spin echo-catalyzed double-angle method (DAM). Targeted B ₁ ⁺ maps were compared with full-FOV...

article

Interactive reduced FOV imaging for projection reconstruction and spiral acquisition

Tobias Schaeffter, Volker Rasche, Peter Börnert, Giel Mens

Magnetic Resonance Imaging > 2001 > 19 > 5 > 677-684

MR fluoroscopy is likely to gain increasing importance for the visualization of dynamic processes such as cardiac function and for the guidance of interventional procedures. In many applications the dynamic processes are restricted to a part of the object under study making reduced field of view (rFOV) imaging desirable. The restriction to a smaller FOV can either be used to increase the spatial or...

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Keywords

REDUCED FOV (18)
MRI (3)
SPINAL CORD (3)
2D RF PULSE (2)
4D FLOW (2)
DWI (2)
FAST IMAGING (2)
FMRI (2)
PARALLEL TRANSMIT (2)
PTX (2)
REDUCED FOX (2)
REPRODUCIBILITY (2)
SPATIALLY SELECTIVE 2D RF EXCITATION (2)
3D IMAGING (1)
7T (1)
9.4T (1)
ABDOMINAL MRI (1)
ADC (1)
BOWEL MOVEMENT (1)
BREAST MRI (1)
CARDIAC GATING (1)
CARDIAC MRE (1)
CATALYZED DOUBLE-ANGLE METHOD (DAM) (1)
CERVICAL SPINAL CORD (1)
CEST (1)
DIFFUSION TENSOR IMAGING (1)
DIFFUSION-WEIGHTED IMAGING (1)
DIFFUSION‐WEIGHTED IMAGING (1)
DIRECTIONAL DIFFUSIVITY (1)
DTI (1)
DYNAMIC SHIMMING (1)
ENDORECTAL (1)
EPI (1)
EPI DISTORTION CORRECTION (1)
HIGH‐FIELD MRI (1)
INNER VOLUME (1)
INTERVERTEBRAL DISC (1)
INVERSION RECOVERY (1)
ISOTROPIC RESOLUTION (1)
LATERAL CORTICOSPINAL TRACT (1)
LOCAL EXCITATION (1)
MIDBRAIN (1)
MR ELASTOGRAPHY (1)
MYOCARDIAL STIFFNESS (1)
NON-NEGATIVE EIGENVALUE PRIORS (1)
ORBIT (1)
OUTER VOLUME (1)
OUTLIER REJECTION (1)
OVS (1)
PARALLEL IMAGING (1)
POSTERIOR COLUMN (1)
PROJECTION RECONSTRUCTION (1)
PROSTATE (1)
REVERSED POLARITY GRADIENT (1)
RPG (1)
SELECTIVE EXCITATION (1)
SENSE (1)
SIMULTANEOUS BRAIN AND SPINAL CORD FMRI (1)
SIMULTANEOUS MULTISEGMENT IMAGING (1)
SPACE (1)
SPIRAL (1)
STIMULATED ECHO (1)
T1 MAPPING (1)
TARGETED RADIOFREQUENCY (RF) FIELD MAPPING (1)
ULTRAHIGH‐B (1)
UNFOLD (1)
UNIVERSAL PULSES (1)
Z2 GRADIENT (1)
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