scholarly journals Parallel imaging acceleration of spiral Fourier velocity encoded MRI using SPIRiT

2012 ◽  
Author(s):  
D. M. Lyra-Leite ◽  
J. L. A. Carvalho
Keyword(s):  
Parallel Imaging ◽  
Parallel Imaging Acceleration

A radiofrequency coil to facilitate B  1+ shimming and parallel imaging acceleration in three dimensions at 7 T

2010 ◽  
Vol 24 (7) ◽  
pp. 815-823 ◽  
Author(s):  
Kyle M. Gilbert ◽  
Andrew T. Curtis ◽  
Joseph S. Gati ◽  
L. Martyn Klassen ◽  
Ravi S. Menon
Keyword(s):  
Parallel Imaging ◽  
Three Dimensions ◽  
Radiofrequency Coil ◽  
Parallel Imaging Acceleration

High-resolution renal MRA: Comparison of image quality and vessel depiction with different parallel imaging acceleration factors

2006 ◽  
Vol 24 (1) ◽  
pp. 95-100 ◽  
Author(s):  
Henrik J. Michaely ◽  
Karin A. Herrmann ◽  
Harald Kramer ◽  
Olaf Dietrich ◽  
Gerhard Laub ◽  
...  
Keyword(s):  
High Resolution ◽  
Image Quality ◽  
Parallel Imaging ◽  
Renal Mra ◽  
Parallel Imaging Acceleration

scholarly journals Echo Planar Diffusion-Weighted Imaging: Possibilities and Considerations with 12- and 32-Channel Head Coils

2012 ◽  
Vol 2 ◽  
pp. 31 ◽  
Author(s):  
John N Morelli ◽  
Megan R Saettele ◽  
Rajesh A Rangaswamy ◽  
Lan Vu ◽  
Clint M Gerdes ◽  
...  
Keyword(s):  
Image Quality ◽  
Parallel Imaging ◽  
Brain Magnetic Resonance Imaging ◽  
Single Shot ◽  
Quality Improvements ◽  
Planar Imaging ◽  
Diffusion Weighted ◽  
Resolution Imaging ◽  
Echo Planar ◽  
Parallel Imaging Acceleration

Interest in clinical brain magnetic resonance imaging using 32-channel head coils for signal reception continues to increase. The present investigation assesses possibilities for improving diffusion-weighted image quality using a 32-channel in comparison to a conventional 12-channel coil. The utility of single-shot (ss) and an approach to readout-segmented (rs) echo planar imaging (EPI) are examined using both head coils. Substantial image quality improvements are found with rs-EPI. Imaging with a 32-channel head coil allows for implementation of greater parallel imaging acceleration factors or acquisition of scans at a higher resolution. Specifically, higher resolution imaging with rs-EPI can be achieved by increasing the number of readout segments without increasing echo-spacing or echo time to the degree necessary with ss-EPI — a factor resulting in increased susceptibility artifact and reduced signal-to-noise with the latter.

Parallel imaging acceleration of EPIK for reduced image distortions in fMRI

NeuroImage ◽  
2013 ◽  
Vol 73 ◽  
pp. 135-143 ◽  
Author(s):  
Seong Dae Yun ◽  
Martina Reske ◽  
Kaveh Vahedipour ◽  
Tracy Warbrick ◽  
N. Jon Shah
Keyword(s):  
Parallel Imaging ◽  
Parallel Imaging Acceleration

Five-Minute Five-Sequence Knee MRI Using Combined Simultaneous Multislice and Parallel Imaging Acceleration: Comparison with 10-Minute Parallel Imaging Knee MRI

Radiology ◽  
2021 ◽  
pp. 203655
Author(s):  
Filippo Del Grande ◽  
Ali Rashidi ◽  
Rodrigo Luna ◽  
Marco Delcogliano ◽  
Steven E. Stern ◽  
...  
Keyword(s):  
Parallel Imaging ◽  
Knee Mri ◽  
Simultaneous Multislice ◽  
Parallel Imaging Acceleration

Design of a Spectroscopic Low-Energy Emission Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 358-359
Author(s):  
Lee H. Veneklasen
Keyword(s):  
Parallel Imaging ◽  
Objective Lens ◽  
Energy Window ◽  
Flat Surfaces ◽  
Beam Voltage ◽  
New Instrument ◽  
Real Time Image ◽  
Image Planes ◽  
Backscatter Diffraction ◽  
Time Image

This paper discusses some of the unique aspects of a spectroscopic emission microscope now being tested in Clausthal. The instrument is designed for the direct parallel imaging of both elastic and inelastic electrons from flat surfaces. Elastic contrast modes of the familiar LEEM include large and small angle LEED, mirror microscopy, backscatter diffraction contrast (for imaging of surface structure), and phase contrast (for imaging of step dynamics)(1). Inelastic modes include topology sensitive secondary, and work function sensitive photoemission. Most important, the new instrument will also allow analytical imaging using characteristic Auger or soft X-ray emissions. The basic instrument has been described by Bauer and Telieps (2). This configuration has been redesigned to include an airlock, and a LaB6 gun, triple condensor lens, magnetic objective lens, a double focussing separator field, an imaging energy analyzer, and a real time image processor.Fig. 1 shows the new configuration. The basic beam voltage supply Vo = 20 KV, upon which separate supplies for the gun Vg, specimen Vs, lens electrode Vf, and analyzer bias Vb float. The incident energy at the sample can be varied from Vs = 0-1 KV for elastic imaging, or from Vg + Vs = (3 + Vs) KV for inelastic imaging. The image energy window Vs±V/2 may be varied without readjusting either the illumation, or imaging/analyzer optics. The diagram shows conjugate diffraction and image planes. The apertures defining incoming Humiliation and outgoing image angles are placed below the separator magnet to allow for their independent optimization. The instrument can illuminate and image 0.5-100 μm fields at 0-1 keV emission energies with an energy window down to 0.2 eV.

Coarctation of the abdominal aorta: Demonstration of a rare anomaly using contrast-enhanced MR-angiography

VASA ◽  
2009 ◽  
Vol 38 (1) ◽  
pp. 66-71 ◽  
Author(s):  
Schubert
Keyword(s):  
Abdominal Aorta ◽  
Mr Angiography ◽  
Parallel Imaging ◽  
Left Renal Vein ◽  
Systemic Hypertension ◽  
Contrast Enhanced ◽  
Younger Age ◽  
Maximum Intensity Projections ◽  
Collateral Vessels ◽  
First Time

We describe a case of aortic coarctation at the level of the infrarenal abdominal aorta which is encountered in less than six individuals in one million. In contrast to aortic narrowing above or including the renal arteries, this seems to be a relatively benign anomaly without systemic hypertension or impaired renal function. For the first time in this type of anomaly, contrast-enhanced MR angiography (ce-MRA) on a multi-receiver channel MR system, with an 8-channel phased array coil and parallel imaging was used. Ce-MRA displayed a tortuous, narrowed aortic segment that was found to be associated with mesenteric artery stenosis and compression of the orthotopic left renal vein, also known as the nutcracker phenomenon. All major aortic branches could be depicted using 3D surface-shaded displays and subvolume maximum intensity projections (MIPs). Collateral vessels of the abdominal wall were identified using whole-volume MIPs. Since the majority of aortic malformations are diagnosed at a younger age, and many suffer from renal insufficiency, we conclude that ce-MRA will eventually place conventional DSA as the modality of choice in malformations of the abdominal aorta.

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