Diffusion-weighted 3D multislab echo planar imaging for high signal-to-noise ratio efficiency and isotropic image resolution

2013 ◽  
Vol 70 (6) ◽  
pp. 1507-1514 ◽  
Author(s):  
Mathias Engström ◽  
Stefan Skare
Keyword(s):  
Signal To Noise Ratio ◽  
Echo Planar Imaging ◽  
Image Resolution ◽  
High Signal ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Diffusion Weighted ◽  
Noise Ratio ◽  
Echo Planar

scholarly journals Improvement of temporal signal-to-noise ratio of GRAPPA accelerated echo planar imaging using a FLASH based calibration scan

2015 ◽  
Vol 75 (6) ◽  
pp. 2362-2371 ◽  
Author(s):  
S. Lalith Talagala ◽  
Joelle E. Sarlls ◽  
Siyuan Liu ◽  
Souheil J. Inati
Keyword(s):  
Signal To Noise Ratio ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Noise Ratio ◽  
Echo Planar

Signal-to-Noise Ratio importance in Apparent Diffusion Coefficient measurements using Diffusion-Weighted Echo-Planar-Imaging scans

2014 ◽  
Vol 4 (2) ◽  
pp. 517-525
Author(s):  
Cristiano Biagini ◽  
Martina De Michele ◽  
Andrea Pratesi ◽  
Francesco Mungai ◽  
Margherita Betti ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Apparent Diffusion Coefficient ◽  
Signal To Noise Ratio ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Diffusion Weighted ◽  
Apparent Diffusion ◽  
Noise Ratio ◽  
Echo Planar

Purpose: To define experimental grounds for Apparent Diffusion Coefficient (ADC) measurements using Spin-Echo Diffusion-Weighted Echo-Planar (SE-DW-EPI) sequences, as a function of Signal-to-Noise Ratio (SNR).Methods: multiple multi-b SE-DW-EPI scans with the same parameters but the lipid suppression technique have been compared on water phantom with a 3T MRI equipment. The SNR has been estimated using the method of difference. Images have been analyzed manually, comparing the signal intensities at different b-values.Results: All measurements show a high repeatability and strong self-consistency. A significant dependence of the ADC on SNR has been shown, and its lowest limitto obtain reliable quantitative answers has been stated.Conclusion: ADC measurements in vivo must be carefully designed to avoid systematic errors during acquisition and post-processing due to low SNR.

The Optimum Field Configuration for Active MASW Survey on Peat Soil

2020 ◽  
Vol 12 (9) ◽  
Author(s):  
K. Basri ◽  
◽  
A. Zainorabidin ◽  
M. K. A. Talib ◽  
N. Wahab ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Peat Soil ◽  
Sampling Interval ◽  
Field Configuration ◽  
Image Resolution ◽  
High Signal ◽  
Signal To Noise ◽  
Noise Ratio ◽  
Masw Method

The application of the MASW method on engineering investigation required optimization of the field configuration to ensure high quality dispersion image for reasonable shear wave velocity profile estimation. The limited investigation with respect to peat soil condition has motivated the study to determine the optimum field configuration for peat soil. The challenging characteristics of peat soil including high void ratio, compressibility, water content and low shear strength further complicates the determination of optimum field configurations. The study focused on the determination of optimum field configurations for active MASW method which includes the receiver spacing, source offset, sensor frequency and sampling interval. The results obtained shows that, the optimum receiver spacing to obtain high signal to noise ratio dispersion image was 1 meter. Smaller receiver spacing causes domination of higher modes and wide bandwidth, while longer receiver spacing causes significant drop in signal to noise ratio governed by rapid energy dissipation with distance. For the source offset, the distance of half the total spread length (X1 = L/2) provides the best resolution and minimised near-field and far-field effect. While, 4.5 Hz sensor frequency and sampling interval between 100 to 250 s provides sufficient low frequencies for deeper depth investigation and denser data. Overall, the influence of receiver spacing, source offset and sensor frequency on the dispersion image resolution was significant.

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