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Design of a logarithmic k‐space spiral trajectory
Design of a Logarithmic k-Space Spiral Trajectory. Harvey E. Cline,1* Xuli Zong,1 and Neville Gai2. Spiral acquisitions are used in fast cardiac imaging because.
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Simple analytic variable density spiral design - Wiley Online Library
lution for designing a flexible set of variable density spiral tra- jectory waveforms is ... able density spiral k-space sampling trajectories achieve this specification while .... ment and the logarithmic magnitude plot through the cen- ter slice of both ...
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Fast 3D imaging using variable-density spiral trajectories with
(15) designed logarithmic k-space trajectories to reduce aliasing artifacts. .... lem is reduced to designing a spiral trajectory and a phase encode. For the spiral ...
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Design of Archimedean and Logarithmic Spiral K-Space Trajectories
Design of Archimedean and Logarithmic Spiral K-Space Trajectories. H. E. Cline, X. Zong, N. Gai†. GE Corporate Research and Development, Schenectady NY, ...
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Spiral trajectory calculations for MRI
Jun 4, 2002 ... Jan- 31 2000. (MRI) by spiral trajectory scanning comprises an MR 1mag. (51) Int . c1.7 . ... k-space in accordance With operator-de?ned spiral scanning. * parameters. .... The design of spiral acquisitions involves traversing the spiral angle at the ... magnitude for a logarithmic spiral; and,. FIGS. 11 and 12 ...
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Low-Thrust Trajectories: An overview of the Q-law and other analytic
31 March 2014. 3rd Talk in the series Optimal Control in Space Mission Design hosted by Stefano ... Logarithmic Spiral: Disadvantages ... Angular momentum. 5  ...
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Download as a PDF - CiteSeerX
The objective of the design was to expand k-space cov- erage with the ... in k- space (a, b, c). The point spread functions are plotted in log scale along the vertical ... interleaf along a dual-density spiral k-space trajectory is shown. 745. S. Sarkar ...
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Advances in sensitivity encoding with arbitrary k‐space trajectories
trated by imaging simulations with spiral, radial, and random k- space patterns. ... Key words: sensitivity encoding; SENSE; k-space trajectories; spiral ...... Logarithmic plots ..... Specific coil design for SENSE: a six-element cardiac array. Magn.
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Optimization of Spiral MRI Using a Perceptual Difference Model - NCBI
image with subsampling of k-space and a “gold standard” image mimicking full acquisition. ... assessment of fast MR image quality that can greatly aid the design of MR acquisition and signal .... were sampled from different spiral trajectories, all of which ..... different noise conditions is shown in the logarithm chart in (a).
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model-based image reconstruction for mri - EECS - University of
tion method for k-space data with full Cartesian sampling. And for well ... [10] for some recent model-based RF pulse design methods. During the readout stage, ...
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Non-Cartesian MRI Scan Time Reduction through Sparse Sampling
Jun 7, 2001 ... 4.4.5 Computation of the log-likelihood and its gradient . . . . . . . . . 54 ..... This property can be exploited when designing and omitting trajectories. ..... Like radial trajectories, spiral ones start at the center of k-space. However ...
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Download PDF - Springer
Jul 31, 2013 ... 3D-spokes kooshball (KB) trajectories, on five healthy volunteers in a ... featuring radial or spiral free induction decay (FID) k-space sampling ...
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Glossary of MRI Terms
logarithmic scale called sound-pressure level expressed in decibels (dB) referenced to the .... The collection of more data points on one side of the k-space origin than on the ..... Proper design of the size and configuration .... include radial filling (back-projection imaging) or spiral filling (spiral imaging). k-space trajectory.
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Advanced Three-Dimensional Tailored RF Pulse for Signal
Oct 13, 2006 ... acquisition side, using spiral in–out (12) or spiral in–in. (13) trajectories ... tation k -space (19), and new pulse design procedures. The proposed .... EV trajectory in 3D excitation k-space, used in the phantom experiment. .... power spectrum ( underlying, in logarithmic gray scale) of the “mod- ified desired ...
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An Improved Density Correction Technique for Voronoi-Based - MIT
Hardware constraints and other design considerations of an acquisition ... In MRI and some other applications, the Fourier-domain (or k-space) image ..... in logarithmic scale. In each of the three ... linear spiral trajectories," in Proc. 4th Meeting ...
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Anisotropic Field-of-View Shapes for Improved PROPELLER Imaging
Key words: PROPELLER, motion correction, trajectory design, anisotropic field-of -view ... The trajectory consists of radial “blades” in k-space which each cover a common central region. This ..... Spiral scanning with anisotropic field of view. Magn Reson ... The PSF images are shown with logarithmic intensities. (a) Isotropic.
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Sensitivity encoding for aligned multishot magnetic - IEEE Xplore
Apr 18, 2016 ... fraction of the k-space is acquired after a single radiofrequency ... by using a spiral trajectory with low resolution navigator im- ages that ..... A. Experimental design ... on a logarithmic scale against the logarithm of the number.
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fast keyhole mr imaging using - IJS
has been taken in the design of the gradient sequence to minimize gradient load. This improved .... popular are sampling schemes in which the trajectory in k- space is spiral (4,5). A reduced number of ... in a logarithmic scale. It can be clearly ...
[ EMB_V17_p307.pdf - Read/Download File

A Nonlocal Transform-Domain Filter for Volumetric Data Denoising
data with non-zero phase from noisy and incomplete Fourier-domain (k- space) measurements. ...... Considerable freedom is given for the design of the 3-D sampling ... use the non-Cartesian trajectories Radial, Spiral, Logarithmic Spiral,.
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SAR Reduction in Transmit SENSE Using Adapted Excitation K
trajectories while preserving most of temporal acceleration. ... Starting with the fastest possible spiral gradient, an adapted rate was ... decreasing the rate of traversal in k-space whenever SOM was above a ... were used for designing pulses, and the field of excitation (FOX) .... and displayed with a logarithmic color scale.).
[ ISMRM2007_0673.pdf - Read/Download File

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