Magnetic resonance elastography for estimating in vivo stiffness of the abdominal aorta using cardiac‐gated spin‐echo echo‐planar imaging: a feasibility study

2020 ◽  
Vol 34 (1) ◽  
Author(s):  
Huiming Dong ◽  
Ning Jin ◽  
Stephan Kannengiesser ◽  
Brian Raterman ◽  
Richard D. White ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Feasibility Study ◽  
Abdominal Aorta ◽  
Spin Echo ◽  
Echo Planar Imaging ◽  
Magnetic Resonance Elastography ◽  
Planar Imaging ◽  
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.

In vivo perfusion measurements in the human placenta using echo planar imaging at 0.5 T

1998 ◽  
Vol 40 (3) ◽  
pp. 467-473 ◽  
Author(s):  
Penny A. Gowland ◽  
Susan T. Francis ◽  
Keith R. Duncan ◽  
Alan J. Freeman ◽  
Bashar Issa ◽  
...  
Keyword(s):  
Human Placenta ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Perfusion Measurements ◽  
Echo Planar

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
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