Journal: Magnetic resonance in medicine

Article Title: Rapid Dynamic Contrast-Enhanced MRI for Small Animals at 7T using 3D Ultra-Short Echo Time and Golden-Angle Radial Sparse Parallel MRI

doi: 10.1002/mrm.27357

Figure Lengend Snippet: 3D golden angle sampling and parallel imaging. (a) modified 3D radial spokes in k-space with azimuth angle Φ = 2πmA and projection length (Z) in kz direction being the modules one of mB, for m = 1, 2, …, 102712 spokes with 2D golden angle means, A = 0.6823 and B = 0.4656. Distribution of 400 projection tips for the random (b), modified (c) and original (d) 3D golden angle sampling. The green areas are computed voronoi regions for k-space sampling density compensation. (e) Demonstration of images of individual channels of the receive coil and the coil sensitivity maps estimated from the temporal average of all spokes.

Article Snippet: Density compensation factors were computed using the 3D Voronoi diagram based method (implemented in Matlab with the function voronoin ), which implements a quick hull algorithm ( 29 ) to compute the volume of each sampling point in k -space.

Techniques: Sampling, Imaging, Modification

Journal: The Journal of Chemical Physics

Article Title: Multiple quantum filtered nuclear magnetic resonance of 23 Na + in uniformly stretched and compressed hydrogels

doi: 10.1063/5.0158608

Figure Lengend Snippet: (a) Radio frequency pulse sequence used for creating, filtering, and detecting SQCs of 23 Na + in uniformly stretched and compressed hydrogels. (b) DQF and (c) TQF 23 Na spectra. Black solid line: experimental spectra; blue solid line: simulated spectra. Spectra were simulated using the Mathematica -based NMR software package SpinDynamica . Simulation parameters: S 0 * = 4.6 × 10 −3 , ω Q /2 π = 84.5 kHz, and τ C = 1.72 ns.

Article Snippet: Experimental 23 Na NMR data were simulated using a numerical procedure from the MatLab -based NMR software package Spinach , see Fig. S2 of the supplementary material.

Techniques: Sequencing, Software

Journal: The Journal of Chemical Physics

Article Title: Multiple quantum filtered nuclear magnetic resonance of 23 Na + in uniformly stretched and compressed hydrogels

doi: 10.1063/5.0158608

Figure Lengend Snippet: Relevant portions of the experimental NMR spectra of 23 Na + in a hydrogel sample acquired under several conditions of uniform stretching and compression and in the relaxed state. Stretching extent: (a) 15 cm; (b) 10 cm; and (c) 5 cm. Compression extent: (d) 15 cm; and (e) 7.5 cm. (f) Relaxed state. Black solid line: experimental spectrum; blue solid line: simulated spectrum. Spectra were simulated using the Mathematica -based NMR software package SpinDynamica .

Article Snippet: Experimental 23 Na NMR data were simulated using a numerical procedure from the MatLab -based NMR software package Spinach , see Fig. S2 of the supplementary material.

Techniques: Software