scholarly journals Multiband accelerated spin-echo echo planar imaging with reduced peak RF power using time-shifted RF pulses

2013 ◽  
Vol 69 (5) ◽  
pp. 1261-1267 ◽  
Author(s):  
Edward J. Auerbach ◽  
Junqian Xu ◽  
Essa Yacoub ◽  
Steen Moeller ◽  
Kâmil Uğurbil
Keyword(s):  
Spin Echo ◽  
Echo Planar Imaging ◽  
Rf Power ◽  
Planar Imaging ◽  
Rf Pulses ◽  
Echo Planar

scholarly journals Magnetic Resonance Fingerprinting with Combined Gradient- and Spin-echo Echo-planar Imaging: Simultaneous Estimation of T1, T2 and T2* with integrated-B1 Correction

2019 ◽  
Author(s):  
Mahdi Khajehim ◽  
Thomas Christen ◽  
J. Jean Chen
Keyword(s):  
Magnetic Resonance ◽  
Spin Echo ◽  
Echo Planar Imaging ◽  
Simultaneous Estimation ◽  
Single Shot ◽  
Planar Imaging ◽  
Reconstruction Process ◽  
Data Segment ◽  
T1 And T2 ◽  
Echo Planar

AbstractPurposeTo introduce a novel magnetic-resonance fingerprinting (MRF) framework with single-shot echo-planar imaging (EPI) readout to simultaneously estimate tissue T2, T1 and T2*, and integrate B1 correction.MethodsSpin-echo EPI is combined with gradient-echo EPI to achieve T2 estimation as well as T1 and T2* quantification. In the dictionary matching step, the GE-EPI data segment provides estimates of tissue T1 and T2* with additional B1 information, which are then incorporated into the T2-matching step that uses the SE-EPI data segment. In this way, biases in T2 and T2* estimates do not affect each other.ResultsAn excellent correspondence was found between our T1, T2, and T2* estimates and results obtained from standard approaches in both phantom and human scans. In the phantom scan, a linear relationship with R2>0.96 was found for all parameter estimates. The maximum error in the T2 estimate was found to be below 6%. In the in-vivo scan, similar contrast was noted between MRF and standard approaches, and values found in a small region of interest (ROI) located in the grey matter (GM) were in line with previous measurements (T2MRF=88±7ms vs T2Ref=89±11ms, T1MRF=1153±154ms vs T1Ref=1122±52ms, T2*MRF=56±4ms vs T2*Ref=53±3ms).ConclusionAdding a spin echo data segment to EPI based MRF allows accurate and robust measurements of T2, T1 and T2* relaxation times. This MRF framework is easier to implement than spiral-based MRF. It doesn’t suffer from undersampling artifacts and seems to require a smaller dictionary size that can fasten the reconstruction process.

Comparison of Turbo Spin Echo and Echo Planar Imaging for intravoxel incoherent motion and diffusion tensor imaging of the kidney at 3 Tesla

2017 ◽  
Vol 27 (3) ◽  
pp. 193-201 ◽  
Author(s):  
Fabian Hilbert ◽  
Tobias Wech ◽  
Henning Neubauer ◽  
Simon Veldhoen ◽  
Thorsten Alexander Bley ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Diffusion Tensor ◽  
Spin Echo ◽  
Echo Planar Imaging ◽  
3 Tesla ◽  
Turbo Spin Echo ◽  
Planar Imaging ◽  
Turbo Spin ◽  
Echo Planar ◽  
And Diffusion

Increased-Contrast, High-Spatial-Resolution, Diffusion-weighted, Spin-Echo, Echo-planar Imaging

Radiology ◽  
1999 ◽  
Vol 210 (1) ◽  
pp. 253-259 ◽  
Author(s):  
Michael R. Thompson ◽  
Ramesh Venkatesan ◽  
Karthik Kuppusamy ◽  
Azim Celik ◽  
Weili Lin ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Spin Echo ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Diffusion Weighted ◽  
Echo Planar

MR elastography of liver fibrosis: preliminary results comparing spin-echo and echo-planar imaging

2008 ◽  
Vol 18 (11) ◽  
pp. 2535-2541 ◽  
Author(s):  
Laurent Huwart ◽  
Najat Salameh ◽  
Leon ter Beek ◽  
Eric Vicaut ◽  
Frank Peeters ◽  
...  
Keyword(s):  
Liver Fibrosis ◽  
Spin Echo ◽  
Echo Planar Imaging ◽  
Mr Elastography ◽  
Planar Imaging ◽  
Preliminary Results ◽  
Echo Planar

scholarly journals Ultrafast bold fMRI using single-shot spin-echo echo planar imaging

2009 ◽  
Vol 34 (1) ◽  
pp. 37 ◽  
Author(s):  
Said Boujraf ◽  
Paul Summers ◽  
Faouzi Belahsen ◽  
Klaas Prussmann ◽  
Spyros Kollias
Keyword(s):  
Spin Echo ◽  
Echo Planar Imaging ◽  
Single Shot ◽  
Planar Imaging ◽  
Bold Fmri ◽  
Echo Planar

scholarly journals Evaluation of Imaging Schemes for Pulsed Arterial Spin Labelling of the Human Kidney Cortex

2018 ◽  
Author(s):  
Charlotte E. Buchanan ◽  
Eleanor F. Cox ◽  
Susan T. Francis
Keyword(s):  
Spin Echo ◽  
Human Kidney ◽  
Echo Planar Imaging ◽  
Arterial Spin Labelling ◽  
Kidney Cortex ◽  
Gradient Echo ◽  
Planar Imaging ◽  
Spatial Coverage ◽  
Echo Planar ◽  
Spin Labelling

Purpose: A number of imaging readout schemes have been proposed for renal arterial spin labelling (ASL) to quantify kidney cortex perfusion, including gradient echo based methods of balanced fast field echo (bFFE) and gradient-echo echo-planar imaging (GE-EPI), or spin echo based schemes of spin-echo echo planar imaging (SE-EPI) and turbo spin-echo (TSE). Here, we compare these imaging schemes to evaluate the optimal imaging scheme for pulsed ASL (PASL) assessment of human kidney cortex perfusion at 3 T. Methods: Ten healthy volunteers with normal renal function were scanned using each 2D multislice imaging scheme, in combination with a respiratory triggered FAIR (flow-sensitive alternating inversion recovery) ASL scheme on a 3 T Philips Achieva scanner. All volunteers returned for a second identical scan session within two weeks of the first scan session. Comparisons were made between the imaging schemes in terms of perfusion weighted image (PWI) signal-to-noise ratio (SNR) and perfusion quantification, temporal SNR (tSNR), spatial coverage, and repeatability. Results: For each imaging scheme, renal cortex perfusion was calculated (bFFE: 276 ± 29 mL/100 g/min, GE-EPI: 222 ± 18 mL/100 g/min, SE-EPI: 201 ± 36 mL/100 g/min, TSE: 200 ± 20 mL/100 g/min). Perfusion was found to be higher for GE based readouts compared to SE based readouts, with significantly higher measured perfusion for the bFFE readout compared to all other schemes (P < 0.05), attributed to the greater vascular signal present. Despite the PWI-SNR being significantly lower for SE-EPI compared to all other schemes (P < 0.05), the SE-EPI readout gave the highest tSNR and was found to be the most reproducible scheme for the assessment of kidney cortex, with a CoV of 17.2%, whilst minimizing variability of the perfusion weighted signal across slices for whole kidney perfusion assessment. Conclusion: For the assessment of kidney cortex perfusion, SE-EPI provides optimal tSNR, minimal variability across slices and repeatable data acquired in a short scan time with low specific absorption rate. 

Single-shot diffusion-weighted echo-planar imaging of normal and cirrhotic livers using a phased-array multicoil

1998 ◽  
Vol 39 (4) ◽  
pp. 440-442 ◽  
Author(s):  
Y. Amano ◽  
T. Kumazaki ◽  
M. Ishihara
Keyword(s):  
Phased Array ◽  
Spin Echo ◽  
B Value ◽  
Echo Planar Imaging ◽  
Single Shot ◽  
Planar Imaging ◽  
Apparent Diffusion Coefficients ◽  
Diffusion Weighted ◽  
Apparent Diffusion ◽  
Echo Planar

Single-shot spin-echo diffusion-weighted echo-planar imaging using a phased-array multicoil was performed to distinguish between normal and cirrhotic livers. Sets of 6 images with different b-values were acquired with breathholding. Significant differences were observed between controls and cirrhosis cases in the signal ratios when the b-value was 383 s/mm2, and apparent diffusion coefficients.

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