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

The Influence of Acquisition Parameters in 3T Echo Planar Imaging: Nyquist Ghost and Signal-to-Noise Ratio Analysis

NeuroImage ◽  
2009 ◽  
Vol 47 ◽  
pp. S81
Author(s):  
A.F. Borgonove ◽  
M.G. Otaduy ◽  
L.F. Gamarra ◽  
E. Amaro
Keyword(s):  
Signal To Noise Ratio ◽  
Echo Planar Imaging ◽  
Ratio Analysis ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Noise Ratio ◽  
Echo Planar

On the signal-to-noise ratio efficiency and slab-banding artifacts in three-dimensional multislab diffusion-weighted echo-planar imaging

2014 ◽  
Vol 73 (2) ◽  
pp. 718-725 ◽  
Author(s):  
Mathias Engström ◽  
Magnus Mårtensson ◽  
Enrico Avventi ◽  
Stefan Skare
Keyword(s):  
Signal To Noise Ratio ◽  
Three Dimensional ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Diffusion Weighted ◽  
Noise Ratio ◽  
Echo Planar

scholarly journals Optimizing signal-to-noise ratio of high-resolution parallel single-shot diffusion-weighted echo-planar imaging at ultrahigh field strengths

2011 ◽  
Vol 67 (3) ◽  
pp. 679-690 ◽  
Author(s):  
Carolin Reischauer ◽  
Robert S. Vorburger ◽  
Bertram J. Wilm ◽  
Thomas Jaermann ◽  
Peter Boesiger
Keyword(s):  
High Resolution ◽  
Signal To Noise Ratio ◽  
Echo Planar Imaging ◽  
Single Shot ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Ultrahigh Field ◽  
Diffusion Weighted ◽  
Echo Planar ◽  
Field Strengths

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.

Effect of Dual and Triple Energy Window Scatter Correction Methods on Image Quality in Liver Scintigraphy

1998 ◽  
Vol 37 (07) ◽  
pp. 239-244 ◽  
Author(s):  
K. Perisinakis ◽  
N. Karkavitsas ◽  
N. Gourtsoyiannis ◽  
J. Damilakis
Keyword(s):  
Signal To Noise Ratio ◽  
Scatter Correction ◽  
Energy Window ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Liver Scintigraphy ◽  
Scatter Compensation ◽  
Compensation Methods ◽  
Hepatic Imaging ◽  
Noise Ratio

Summary Aim: To investigate the effect of two scatter correction methods on lesion detectability for both planar and tomographic hepatic imaging. Methods: All planar and tomographic acquisitions involved simultaneous collection of photons in the main photopeak window (126-1 54 keV) and three additional windows (92-116, 116-126 and 154-164 keV). Uncorrected and corrected for scatter images were obtained from the same acquisition data. The dual energy window (DEW) and the triple energy window (TEW) scatter compensation methods were used to obtain two sets of corrected images. The DEW method was implemented with main photopeak window 126-154 keV, Compton scatter window 92-126 keVand scatter multiplier k = 0.5. A modified TEW method was also applied with main photopeak window 126-154 keV and scatter subwindows 116-126 keV and 154-164 keV. Phantoms were used to study the effect of scatter correction on contrast and signal-to-noise ratio. The observer’s ability to identify lesions was studied on uncorrected and corrected for scatter patient images. Results: In planar imaging, both scatter compensation methods yielded contrast enhancement. However signal to noise ratio (SNR) was degraded to 0.63 and 0.67 when DEW and TEW were applied respectively. In SPECT images, contrast was increased by a factor of 2.4 and 1.7, while SNR was degraded to 0.60 and 0.64 when DEW and TEW methods were used respectively. Conclusions: Scatter correction using DEW and TEW methods may improve observer’s ability to distinguish lesions in planar (p<0.05 for both methods) and SPECT (p<0.05 for both methods) liver studies.

scholarly journals Temporal Signal-to-Noise Changes in Combined Multislice- and In-Plane-Accelerated Echo-Planar Imaging with a 20- and 64-Channel Coil

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Philipp Seidel ◽  
Seth M. Levine ◽  
Marlene Tahedl ◽  
Jens V. Schwarzbach
Keyword(s):  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Channel Coil ◽  
Echo Planar

scholarly journals Signal-to-noise ratio and spectral linewidth improvements between 1.5 and 7 Tesla in proton echo-planar spectroscopic imaging

2006 ◽  
Vol 56 (6) ◽  
pp. 1200-1210 ◽  
Author(s):  
Ricardo Otazo ◽  
Bryon Mueller ◽  
Kamil Ugurbil ◽  
Lawrence Wald ◽  
Stefan Posse
Keyword(s):  
Signal To Noise Ratio ◽  
Spectroscopic Imaging ◽  
7 Tesla ◽  
Signal To Noise ◽  
Spectral Linewidth ◽  
Noise Ratio ◽  
Proton Echo ◽  
Echo Planar
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