Correction of Artifacts Induced by B 0 Inhomogeneities in Breast MRI Using Reduced‐ Field‐of‐View Echo‐Planar Imaging and Enhanced Reversed Polarity Gradient Method

2021 ◽  
Author(s):  
Ana E. Rodríguez‐Soto ◽  
Lauren K. Fang ◽  
Dominic Holland ◽  
Jingjing Zou ◽  
Helen H. Park ◽  
...  
Keyword(s):  
Gradient Method ◽  
Breast Mri ◽  
Echo Planar Imaging ◽  
Field Of View ◽  
Planar Imaging ◽  
Reversed Polarity ◽  
Echo Planar

scholarly journals Robust 2D phase correction for echo planar imaging under a tight field-of-view

2010 ◽  
Vol 64 (6) ◽  
pp. 1800-1813 ◽  
Author(s):  
Dan Xu ◽  
Kevin F. King ◽  
Yuval Zur ◽  
R. Scott Hinks
Keyword(s):  
Phase Correction ◽  
Echo Planar Imaging ◽  
Field Of View ◽  
Planar Imaging ◽  
Echo Planar

scholarly journals Correction of Artifacts Induced by B0 Inhomogeneities in Breast MRI using Reduced Field-of-View Echo-Planar Imaging and Enhanced Reverse Polarity Gradient Method

2020 ◽  
Author(s):  
Ana E. Rodríguez-Soto ◽  
Helen Park ◽  
Dominic Holland ◽  
Kathryn E. Keenan ◽  
Hauke Bartsch ◽  
...  
Keyword(s):  
Breast Imaging ◽  
Pulse Sequences ◽  
Echo Planar Imaging ◽  
Distortion Correction ◽  
Field Of View ◽  
Planar Imaging ◽  
Reverse Polarity ◽  
Maximum Displacement ◽  
Breast Phantom ◽  
Echo Planar

AbstractPurposeDiffusion weighted (DW) echo-planar imaging (EPI) is prone to geometric and intensity distortions due to B0 inhomogeneities. Pulse sequences that excite spins within a reduced field-of-view (FOV) in the phase encoding (PE) direction have been developed to decrease such distortions. In addition, use of the reverse polarity gradient (RPG) method, a retrospective approach to correct distortion artifacts, has been shown to improve the localization of tumor lesions. The purpose of this work was to evaluate the performance of reduced-FOV acquisition and RPG in decreasing distortion artifacts for breast imaging.MethodsEPI data were acquired with full and reduced-FOV in a breast phantom and in a group of 170 women at 3T. The performance of RPG in correcting distortion artifacts in EPI data was evaluated using the mutual information (MI) metric between EPI and anatomical low-distortion images before and after distortion correction.ResultsRPG corrected distortions by 61% in full-FOV EPI and 48% in reduced-FOV EPI in a breast phantom. In patients, MI increased on average 13±8% and 8±6% for both full and reduced-FOV EPI data after distortion correction, respectively. The 95th percentile and maximum displacement between uncorrected and corrected full-FOV EPI datasets were 0.8±0.3cm and 1.9±0.3cm, and for reduced-FOV were 0.4±0.2cm and 1.3±0.3cm.ConclusionMinimal distortion was achieved with RPG applied to reduced-FOV EPI data. RPG improved distortions for full-FOV, but with more modest improvements and limited correction near the nipple.

scholarly journals Reduced Field-of-View Diffusion Imaging of the Human Spinal Cord: Comparison with Conventional Single-Shot Echo-Planar Imaging

2011 ◽  
Vol 32 (5) ◽  
pp. 813-820 ◽  
Author(s):  
G. Zaharchuk ◽  
E.U. Saritas ◽  
J.B. Andre ◽  
C.T. Chin ◽  
J. Rosenberg ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Diffusion Imaging ◽  
Echo Planar Imaging ◽  
Field Of View ◽  
Single Shot ◽  
Planar Imaging ◽  
Human Spinal Cord ◽  
Echo Planar
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