| 1. |
- Dahlqvist Leinhard, Olof, et al.
(författare)
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Quantification of abdominal fat accumulation during hyperalimentation using MRI
- 2009
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Ingår i: Proceedings of the ISMRM Annual Meeting (ISMRM'09), 2009. - Berkeley, CA, USA : International Society for Magnetic Resonance in Medicine. ; , s. 206-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- There is an increasing demand for imaging methods that can be used for automatic, accurate and quantitative determination of the amounts of abdominal fat. Such methods are important as they will allow the evaluation of some of the risk factors underlying the ’metabolic syndrome’. The metabolic syndrome is becoming common in large parts of the world, and it appears that a dominant risk factor for developing this syndrome is abdominal obesity. Subjects that are afflicted with the metabolic syndrome are exposed to a high risk for developing a large range of diseases such as type 2 diabetes, cardiac failure, and stroke. The aim of this work
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| 2. |
- Leinhard, Olof Dahlqvist, et al.
(författare)
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Quantitative Abdominal Fat Estimation Using MRI
- 2008
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Ingår i: Proceedings - International Conference on Pattern Recognition. - : IEEE Computer Society. - 9781424421749 - 9781424421756 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- This paper introduces a new method for automaticquantification of subcutaneous, visceral and nonvisceralinternal fat from MR-images acquired usingthe two point Dixon technique in the abdominal region.The method includes (1) a three dimensionalphase unwrapping to provide water and fat images, (2)an image intensity inhomogeneity correction, and (3) amorphon based registration and segmentation of thetissue. This is followed by an integration of the correctedfat images within the different fat compartmentsthat avoids the partial volume effects associated withtraditional fat segmentation methods. The method wastested on 18 subjects before and after a period of fastfoodhyper-alimentation showing high stability andperformance in all analysis steps.
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| 3. |
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| 4. |
- Rydell, Joakim, et al.
(författare)
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Phase Sensitive Reconstruction for Water/Fat Separation in MR Imaging Using Inverse Gradient
- 2007
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Ingår i: Medical Image Computing and Computer-Assisted Intervention – MICCAI 2007. 10th International Conference, Brisbane, Australia, October 29 - November 2, 2007, Proceedings, Part I. - Berlin, Heidelberg : Springer Berlin/Heidelberg. - 9783540757566 - 9783540757573 ; , s. 210-218
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Konferensbidrag (refereegranskat)abstract
- This paper presents a novel method for phase unwrapping for phase sensitive reconstruction in MR imaging. The unwrapped phase is obtained by integrating the phase gradient by solving a Poisson equation. An efficient solver, which has been made publicly available, is used to solve the equation. The proposed method is demonstrated on a fat quantification MRI task that is a part of a prospective study of fat accumulation. The method is compared to a phase unwrapping method based on region growing. Results indicate that the proposed method provides more robust unwrapping. Unlike region growing methods, the proposed method is also straight-forward to implement in 3D.
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| 5. |
- Rydell, Joakim, et al.
(författare)
-
Three Dimensional Phase Sensitive Reconstruction for Water/Fat Separation in MR Imaging using Inverse Gradient
- 2008
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Ingår i: Proceedings of the International Society for Magnetic Resonance in Medicine annual meeting (ISMRM'08). ; , s. 1519-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Three dimensional phase sensitive reconstruction on two point Dixon volumes has been implemented with use of the inverse gradient. The results has beencompared with the inverse gradient method in two dimensions as well as with the well established region growing method proposed by Ma. The inversegradient method in 3D is able to unwrap the phase field in uncertain regions where the region growing method and the inverse gradient method in 2D cometo a stop.
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