Filters








1,089 Hits in 5.9 sec

Motion-robust parameter estimation in abdominal diffusion-weighted MRI by simultaneous image registration and model estimation

Sila Kurugol, Moti Freiman, Onur Afacan, Liran Domachevsky, Jeannette M. Perez-Rossello, Michael J. Callahan, Simon K. Warfield
2017 Medical Image Analysis  
Specifically, we estimated motioncompensated model parameters by simultaneously solving image registration and model estimation (SIR-ME) problems utilizing the interdependence of acquired volumes along  ...  Graphical abstract Keywords Diffusion-weighted imaging; motion compensation; abdomen; intra voxel incoherent motion model Kurugol et al.  ...  Simultaneous Image Registration and Model Estimation (SIR-ME) for Motion-Compensated DW-MRI We introduce a motion-compensated parameter estimation model that simultaneously solves image registration and  ... 
doi:10.1016/j.media.2017.04.006 pmid:28494271 pmcid:PMC5514879 fatcat:x6c54udtavaezdl3hb4b2bz2um

Motion Compensated Abdominal Diffusion Weighted MRI by Simultaneous Image Registration and Model Estimation (SIR-ME) [chapter]

Sila Kurugol, Moti Freiman, Onur Afacan, Liran Domachevsky, Jeannette M. Perez-Rossello, Michael J. Callahan, Simon K. Warfield
2015 Lecture Notes in Computer Science  
In this work, we introduce a motion-compensated parameter estimation framework that simultaneously solves image registration and model estimation (SIR-ME) problems by utilizing the interdependence of acquired  ...  parameter estimates obtained by fitting the signal decay model to the acquired DW-MRI images.  ...  Methods Simultaneous Image Registration and Model Estimation (SIR-ME) for Motion Compensated DW-MRI Parameter Estimation In abdominal DW-MRI, we acquire images at multiple (i = 1‥N) b-values.  ... 
doi:10.1007/978-3-319-24574-4_60 pmid:26550612 pmcid:PMC4636124 fatcat:l7vet6owh5hhlga4zgzwhkedni

Front Matter: Volume 10133

Proceedings of SPIE, Martin A. Styner, Elsa D. Angelini
2017 Medical Imaging 2017: Image Processing  
of non-rigid registration parameters for atlas-based segmentation of CT images of human cochlea [10133-35] 10133 10 ACIR: automatic cochlea image registration [10133-36] 10133 11 Whole-body diffusion-weighted  ...  in MR/CT using detectors trained by articulated parameterized spine model [10133-45] 10133 1A Subject-specific longitudinal shape analysis by coupling spatiotemporal shape modeling with medial analysis  ... 
doi:10.1117/12.2270368 dblp:conf/miip/X17 fatcat:resfpzholvbtbalfkbg3pj64gu

Robust estimation of the apparent diffusion coefficient invariant to acquisition noise and physiological motion

Santiago Sanz-Estébanez, Tomasz Pieciak, Carlos Alberola-López, Santiago Aja-Fernández
2018 Magnetic Resonance Imaging  
Purpose: In this work we have proposed a methodology for the estimation of the apparent diffusion coefficient in the body from multiple breath hold diffusion weighted images, which is robust to two preeminent  ...  Methods: We have extended a method for the joint groupwise multimodal registration and apparent diffusion coefficient estimation, previously proposed by the authors, in order to correct the bias that arises  ...  Acknowledgments This work was partially supported by the European Regional Development  ... 
doi:10.1016/j.mri.2018.07.005 pmid:30036654 fatcat:dubexjh4ezhlxjalochgsutmdu

A Unified Approach to Diffusion Direction Sensitive Slice Registration and 3-D DTI Reconstruction From Moving Fetal Brain Anatomy

Mads Fogtmann, Sharmishtaa Seshamani, Christopher Kroenke, Xi Cheng, Teresa Chapman, Jakob Wilm, Francois Rousseau, Colin Studholme
2014 IEEE Transactions on Medical Imaging  
Previous image registration techniques have been described to estimate the between slice fetal head motion, allowing the reconstruction of 3D a diffusion estimate on a regular grid using interpolation.  ...  This also incorporates image resolution modeling to iteratively deconvolve the effects of the imaging point spread function using the multiple views provided by thick slices acquired in different anatomical  ...  The noise therefore needs to be estimated simultaneously with the image and transformation parameters.  ... 
doi:10.1109/tmi.2013.2284014 pmid:24108711 pmcid:PMC4271809 fatcat:reaqfnwjibgtve2iue3ndxpuxu

GIFTed Demons: deformable image registration with local structure-preserving regularization using supervoxels for liver applications

Bartłomiej W. Papież, James M. Franklin, Mattias P. Heinrich, Fergus V. Gleeson, Michael Brady, Julia A. Schnabel
2018 Journal of Medical Imaging  
Deformable image registration, a key component of motion correction in medical imaging, needs to be efficient and provides plausible spatial transformations that reliably approximate biological aspects  ...  We illustrate the approach by applying it to estimate sliding motions at lung and liver interfaces on challenging four-dimensional computed tomography (CT) and dynamic contrast-enhanced magnetic resonance  ...  Acknowledgments The authors acknowledge funding from the Cancer Research UK/Engineering and Physical Sciences Research Council Cancer Imaging Centre at Oxford. B.W.P. would like to thank D.F.  ... 
doi:10.1117/1.jmi.5.2.024001 pmid:29662918 pmcid:PMC5886381 fatcat:ulgejw2uknc5zjeidvh4qau7lq

Registration of Free-Breathing 3D+t Abdominal Perfusion CT Images via Co-segmentation [chapter]

Raphael Prevost, Blandine Romain, Remi Cuingnet, Benoit Mory, Laurence Rouet, Olivier Lucidarme, Laurent D. Cohen, Roberto Ardon
2013 Lecture Notes in Computer Science  
Dynamic contrast-enhanced computed tomography (DCE-CT) is a valuable imaging modality to assess tissues properties, particularly in tumours, by estimating pharmacokinetic parameters from the evolution  ...  The proposed method is validated on 15 datasets acquired from patients with renal lesions and shows improvement in terms of registration and estimation of pharmacokinetic parameters over the state-of-the-art  ...  The major challenge in parameter estimation is therefore to design a robust registration method, that cannot use temporal consistency because of the low framerate.  ... 
doi:10.1007/978-3-642-40763-5_13 fatcat:v6b65lddjbcrhic3pekzk46mdi

2007 Index IEEE Transactions on Medical Imaging Vol. 26

2007 IEEE Transactions on Medical Imaging  
., +, TMI Jan. 2007 68-76 Estimating 3-D Respiratory Motion From Orbiting Views by Tomographic Image Registration.  ...  ., +, TMI Feb. 2007 249-260 Estimating 3-D Respiratory Motion From Orbiting Views by Tomographic Image Registration.  ... 
doi:10.1109/tmi.2007.912905 fatcat:4kodjew23ffjvebqt5fopjo5oa

Optimal acquisition scheme for flow‐compensated intravoxel incoherent motion diffusion‐weighted imaging in the abdomen: An accurate and precise clinically feasible protocol

Oliver J. Gurney‐Champion, Susanne S. Rauh, Kevin Harrington, Uwe Oelfke, Frederik B. Laun, Andreas Wetscherek
2019 Magnetic Resonance in Medicine  
Flow-compensated (FC) diffusion-weighted MRI (DWI) for intravoxel-incoherent motion (IVIM) modeling allows for a more detailed description of tissue microvasculature than conventional IVIM.  ...  Therefore, we developed an optimized abdominal FC-IVIM acquisition with a clinically feasible scan time.  ...  the intravoxel incoherent motion (IVIM) model fit to diffusion-weighted MRI (DWI) data is a promising example without contrast injection.  ... 
doi:10.1002/mrm.27990 pmid:31566262 pmcid:PMC6899942 fatcat:ss3lrj3lafdhpjqtcxtazitksy

Separating fetal and maternal placenta circulations using multiparametric MRI

Andrew Melbourne, Rosalind Aughwane, Magdalena Sokolska, David Owen, Giles Kendall, Dimitra Flouri, Alan Bainbridge, David Atkinson, Jan Deprest, Tom Vercauteren, Anna David, Sebastien Ourselin
2018 Magnetic Resonance in Medicine  
In this work, we propose a new multiparametric model for placental tissue signal in MRI.  ...  fitted to overlapping multiecho T2 relaxometry and diffusion MRI with low b-values.  ...  ACKNOWLEDGMENT We thank all the families who agreed to take part in this research. ORCID David Owen http://orcid.org/0000-0002-5381-7722 David Atkinson http://orcid.org/0000-0003-1124-6666  ... 
doi:10.1002/mrm.27406 pmid:30239036 fatcat:2culbfa4xfg6ddjp2whon4obha

Technical advancements and protocol optimization of diffusion-weighted imaging (DWI) in liver

Ping Ni, Yuning Lin, Qun Zhong, Ziqian Chen, Kumar Sandrasegaran, Chen Lin
2016 Abdominal Radiology  
An area of rapid advancement in abdominal MRI is diffusion-weighted imaging (DWI).  ...  More advanced DWI techniques, including Intra-Voxel Incoherent Motion (IVIM) diffusion imaging, anomalous diffusion imaging, and Diffusion Kurtosis Imaging (DKI) are discussed.  ...  Page 4 Diffusion-weighted Echo-planar Imaging (EPI) In order to make MRI signal sensitive to the diffusive motion of water molecules, a diffusion encoding module can be added to a MRI pulse sequence.  ... 
doi:10.1007/s00261-015-0602-x pmid:26830624 fatcat:eusrd4ae6jhz5p6vr4mdw2pfg4

DCE-MRI, DW-MRI, and MRS in Cancer

Jessica M. Winfield, Geoffrey S. Payne, Alex Weller, Nandita M. deSouza
2016 Topics in Magnetic Resonance Imaging (TMRI)  
Multi-parametric magnetic resonance imaging (mpMRI) offers a unique insight into tumor biology by combining functional MRI techniques that inform on cellularity (diffusion-weighted MRI), vascular properties  ...  Challenges in the application of mpMRI in the clinic include the technical considerations in acquiring good quality functional MRI data, development of robust techniques for analysis, and clinical interpretation  ...  Centre and the Clinical Research Facility in Imaging.  ... 
doi:10.1097/rmr.0000000000000103 pmid:27748710 pmcid:PMC5081190 fatcat:7f64gjelhrgrvlv4obgwb2mnc4

Evaluation of semiautomated quantification of cranial ultrasound images in newborns as a predictor of Neonatal Behavioral Assessment Scale

E. Bonet-Carne, V. Tenorio, F. Figueras, E. Gratacos, I. Amat-Roldan
2011 2011 IEEE International Symposium on Biomedical Imaging: From Nano to Macro  
WITH ............................931 EXISTING DIFFUSION WEIGHTED MRI METHODS Alpay Özcan, Washington University in Saint Louis, United States TH-OS4.4: EXACT INTEGRATION OF DIFFUSION ORIENTATION DISTRIBUTION  ...  Calhoun, The Mind Research Network and The University of New Mexico, United States; Tulay Adali, University of Maryland, Baltimore County, United States TH-PS1b.1: ROBUST REAL TIME MOTION ESTIMATION  ... 
doi:10.1109/isbi.2011.5872350 dblp:conf/isbi/Bonet-CarneTFGA11 fatcat:hz26tx4dmzbbnefruo7eh5jrbm

MRI Measurement of Placental Perfusion and Fetal Blood Oxygen Saturation in Normal Pregnancy and Placental Insufficiency [chapter]

Rosalind Aughwane, Magdalena Sokolska, Alan Bainbridge, David Atkinson, Giles Kendall, Jan Deprest, Tom Vercauteren, Anna L. David, Sébastien Ourselin, Andrew Melbourne
2018 Lecture Notes in Computer Science  
The fetal blood saturation is a relative unknown, thus we describe a method to simultaneously estimate the fetal blood volume in addition to the fetal blood T2 relaxation time from which we can estimate  ...  We report differences in vascular compartments and saturation values observed between 5 normal pregnancies, and two complicated by placental insufficiency.  ...  Acknowledgements We would like to acknowledge the Wellcome Trust (210182/Z/18/Z, 101957/Z/13/Z), the National Institute for Health Research (NIHR), the EP-SRC (NS/A000027/1) and the Radiological Research  ... 
doi:10.1007/978-3-030-00934-2_101 fatcat:nmgfbt2kwzgf7o4vfojvf4b4ty

Capturing intraoperative deformations: research experience at Brigham and Women's hospital

Simon K. Warfield, Steven J. Haker, Ion-Florin Talos, Corey A. Kemper, Neil Weisenfeld, Andrea U.J. Mewes, Daniel Goldberg-Zimring, Kelly H. Zou, Carl-Fredrik Westin, William M. Wells, Clare M.C. Tempany, Alexandra Golby (+3 others)
2005 Medical Image Analysis  
We have developed algorithms to model the motion of key anatomical structures and system implementations that enable us to estimate the deformation of the critical anatomy from sequences of volumetric  ...  This paper reviews the experience at Brigham and WomenÕs Hospital through the process of developing and applying novel algorithms for capturing intraoperative deformations in support of image guided therapy  ...  Acknowledgements This investigation was supported in part by NIH Grants R21 MH67054, R01 LM007861, P41 RR13218, P01 CA67165, R01 AG19513 and R33 CA99015 and by a research grant from CIMIT.  ... 
doi:10.1016/j.media.2004.11.005 pmid:15721230 fatcat:mahu4a6za5gz5lpg3sr2crzkfq
« Previous Showing results 1 — 15 out of 1,089 results