Editorial for “Retrospective Distortion and Motion Correction for Free‐Breathing DW‐MRI of the Kidneys Using Dual Echo EPI and Slice‐to‐Volume Registration”

2021 ◽  
Author(s):  
Valdair F. Muglia ◽  
Carlos Ernesto Garrido Salmon
Keyword(s):  
Motion Correction ◽  
Free Breathing ◽  
Volume Registration ◽  
Dual Echo

scholarly journals Motion correction of free-breathing magnetic resonance renography using model-driven registration

2021 ◽  
Author(s):  
Dimitra Flouri ◽  
Daniel Lesnic ◽  
Constantina Chrysochou ◽  
Jehill Parikh ◽  
Peter Thelwall ◽  
...  
Keyword(s):  
Motion Correction ◽  
Ground Truth ◽  
Free Breathing ◽  
Patient Data ◽  
Reference Object ◽  
Free Form ◽  
Model Driven ◽  
Time Courses ◽  
Signal Time ◽  
Parametric Maps

Abstract Introduction Model-driven registration (MDR) is a general approach to remove patient motion in quantitative imaging. In this study, we investigate whether MDR can effectively correct the motion in free-breathing MR renography (MRR). Materials and methods MDR was generalised to linear tracer-kinetic models and implemented using 2D or 3D free-form deformations (FFD) with multi-resolution and gradient descent optimization. MDR was evaluated using a kidney-mimicking digital reference object (DRO) and free-breathing patient data acquired at high temporal resolution in multi-slice 2D (5 patients) and 3D acquisitions (8 patients). Registration accuracy was assessed using comparison to ground truth DRO, calculating the Hausdorff distance (HD) between ground truth masks with segmentations and visual evaluation of dynamic images, signal-time courses and parametric maps (all data). Results DRO data showed that the bias and precision of parameter maps after MDR are indistinguishable from motion-free data. MDR led to reduction in HD (HDunregistered = 9.98 ± 9.76, HDregistered = 1.63 ± 0.49). Visual inspection showed that MDR effectively removed motion effects in the dynamic data, leading to a clear improvement in anatomical delineation on parametric maps and a reduction in motion-induced oscillations on signal-time courses. Discussion MDR provides effective motion correction of MRR in synthetic and patient data. Future work is needed to compare the performance against other more established methods.

scholarly journals Free-breathing myocardial T2* mapping using GRE-EPI and automatic Non-rigid motion correction

2015 ◽  
Vol 17 (1) ◽  
Author(s):  
Ning Jin ◽  
Juliana Serafim da Silveira ◽  
Marie-Pierre Jolly ◽  
David N. Firmin ◽  
George Mathew ◽  
...  
Keyword(s):  
Motion Correction ◽  
T2 Mapping ◽  
Rigid Motion ◽  
Free Breathing

scholarly journals Free-breathing with motion-correction and video projection during cardiac MRI : a paediatric design !

2014 ◽  
Vol 16 (S1) ◽  
Author(s):  
Laurent Bonnemains ◽  
Freddy Odille ◽  
Aboubaker Cherifi ◽  
Pierre-Yves Marie ◽  
Cedric Pasquier ◽  
...  
Keyword(s):  
Cardiac Mri ◽  
Motion Correction ◽  
Free Breathing ◽  
Video Projection

scholarly journals Free-breathing pediatric MRI with nonrigid motion correction and acceleration

2014 ◽  
Vol 42 (2) ◽  
pp. 407-420 ◽  
Author(s):  
Joseph Y. Cheng ◽  
Tao Zhang ◽  
Nichanan Ruangwattanapaisarn ◽  
Marcus T. Alley ◽  
Martin Uecker ◽  
...  
Keyword(s):  
Motion Correction ◽  
Free Breathing ◽  
Nonrigid Motion ◽  
Pediatric Mri

scholarly journals Free breathing DCE-MRI with motion correction and its values for benign and malignant liver tumor differentiation

2015 ◽  
Vol 2 (2) ◽  
pp. 65-71
Author(s):  
Xiaolin Zheng ◽  
Lihua Xiao ◽  
Xianmiao Fan ◽  
Ning Huang ◽  
Zihua Su ◽  
...  
Keyword(s):  
Liver Tumor ◽  
Motion Correction ◽  
Free Breathing ◽  
Tumor Differentiation ◽  
Malignant Liver Tumor ◽  
Dce Mri ◽  
Malignant Liver
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