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

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. 

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

Imaging Articular Cartilage Defects with 3D Fat-Suppressed Echo Planar Imaging: Comparison with Conventional 3D Fat-Suppressed Gradient Echo Sequence and Correlation with Histology

1998 ◽  
Vol 22 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Siegfried Trattnig ◽  
Monika Huber ◽  
Martin J. Breitenseher ◽  
Hans-Joerg Trnka ◽  
Thomas Rand ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Echo Planar Imaging ◽  
Cartilage Defects ◽  
Gradient Echo ◽  
Planar Imaging ◽  
Echo Planar ◽  
Articular Cartilage Defects

Ultrafast interleaved gradient-echo-planar imaging on a standard scanner

1993 ◽  
Vol 30 (5) ◽  
pp. 609-616 ◽  
Author(s):  
G. C. McKinnon
Keyword(s):  
Echo Planar Imaging ◽  
Gradient Echo ◽  
Planar Imaging ◽  
Echo Planar

scholarly journals Compensation of slice profile mismatch in combined spin- and gradient-echo echo-planar imaging pulse sequences

2011 ◽  
Vol 67 (2) ◽  
pp. 378-388 ◽  
Author(s):  
Heiko Schmiedeskamp ◽  
Matus Straka ◽  
Roland Bammer
Keyword(s):  
Pulse Sequences ◽  
Echo Planar Imaging ◽  
Gradient Echo ◽  
Planar Imaging ◽  
Slice Profile ◽  
Echo Planar
Sign in / Sign up

Export Citation Format

Share Document