scholarly journals Simultaneous p H ‐sensitive and oxygen‐sensitive MRI of human gliomas at 3 T using multi‐echo amine proton chemical exchange saturation transfer spin‐and‐gradient echo echo‐planar imaging ( CEST‐SAGE‐EPI )

2018 ◽  
Vol 80 (5) ◽  
pp. 1962-1978 ◽  
Author(s):  
Robert J. Harris ◽  
Jingwen Yao ◽  
Ararat Chakhoyan ◽  
Catalina Raymond ◽  
Kevin Leu ◽  
...  
Keyword(s):  
Chemical Exchange ◽  
Echo Planar Imaging ◽  
Chemical Exchange Saturation Transfer ◽  
Saturation Transfer ◽  
Gradient Echo ◽  
Planar Imaging ◽  
Human Gliomas ◽  
Oxygen Sensitive ◽  
Echo Planar

Simulation, phantom validation, and clinical evaluation of fast pH-weighted molecular imaging using amine chemical exchange saturation transfer echo planar imaging (CEST-EPI) in glioma at 3 T

2016 ◽  
Vol 29 (11) ◽  
pp. 1563-1576 ◽  
Author(s):  
Robert J. Harris ◽  
Timothy F. Cloughesy ◽  
Linda M. Liau ◽  
Phioanh L. Nghiemphu ◽  
Albert Lai ◽  
...  
Keyword(s):  
Molecular Imaging ◽  
Clinical Evaluation ◽  
Chemical Exchange ◽  
Echo Planar Imaging ◽  
Chemical Exchange Saturation Transfer ◽  
Saturation Transfer ◽  
Planar Imaging ◽  
Echo Planar ◽  
Phantom Validation

scholarly journals Improved image reconstruction for partial fourier gradient-echo echo-planar imaging (EPI)

2008 ◽  
Vol 59 (4) ◽  
pp. 916-924 ◽  
Author(s):  
Nan-kuei Chen ◽  
Koichi Oshio ◽  
Lawrence P. Panych
Keyword(s):  
Image Reconstruction ◽  
Echo Planar Imaging ◽  
Gradient Echo ◽  
Planar Imaging ◽  
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. 

scholarly journals Designing hyperbolic secant excitation pulses to reduce signal dropout in gradient-echo echo-planar imaging

2014 ◽  
Vol 74 (3) ◽  
pp. 661-672 ◽  
Author(s):  
Stephen J. Wastling ◽  
Gareth J. Barker
Keyword(s):  
Echo Planar Imaging ◽  
Gradient Echo ◽  
Planar Imaging ◽  
Echo Planar ◽  
Signal Dropout

Fat-suppressed 3D-T1-weighted-echo planar imaging: comparison with fat-suppressed 3D-T1-weighted-gradient echo in imaging the cartilage of the knee

2002 ◽  
Vol 26 (3) ◽  
pp. 159-165 ◽  
Author(s):  
Apostolos H. Karantanas ◽  
Aristidis H. Zibis ◽  
Panagiotis Kitsoulis
Keyword(s):  
Echo Planar Imaging ◽  
Gradient Echo ◽  
Planar Imaging ◽  
Echo Planar
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