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Your search keyword '"Hlawitschka M"' showing total 17 results
Start Over Author "Hlawitschka M" Publisher wiley
17 results on '"Hlawitschka M"'

17. Semi-automated generation of individual computational models of the human head and torso from MR images.

Author

Kalloch B, Bode J, Kozlov M, Pampel A, Hlawitschka M, Sehm B, Villringer A, Möller HE, and Bazin PL

Subjects
Adult, Algorithms, Cerebrospinal Fluid diagnostic imaging, Computer Simulation, Electromagnetic Fields, Gray Matter diagnostic imaging, Healthy Volunteers, Humans, Male, Pattern Recognition, Automated, Phantoms, Imaging, Programming Languages, Skin diagnostic imaging, Skull diagnostic imaging, Software, Spinal Cord diagnostic imaging, White Matter diagnostic imaging, Young Adult, Brain diagnostic imaging, Head diagnostic imaging, Image Processing, Computer-Assisted methods, Magnetic Resonance Imaging, Torso diagnostic imaging
Abstract

Purpose: Simulating the interaction of the human body with electromagnetic fields is an active field of research. Individualized models are increasingly being used, as anatomical differences affect the simulation results. We introduce a processing pipeline for creating individual surface-based models of the human head and torso for application in simulation software based on unstructured grids. The pipeline is designed for easy applicability and is publicly released on figshare., Methods: The pipeline covers image acquisition, segmentation, generation of segmentation masks, and surface mesh generation of the single, external boundary of each structure of interest. Two gradient-echo sequences are used for image acquisition. Structures of the head and body are segmented using several atlas-based approaches. They consist of bone/skull, subarachnoid cerebrospinal fluid, gray matter, white matter, spinal cord, lungs, the sinuses of the skull, and a combined class of all other structures including skin. After minor manual preparation, segmentation images are processed to segmentation masks, which are binarized images per segmented structure free of misclassified voxels and without an internal boundary. The proposed workflow is applied to 2 healthy subjects., Results: Individual differences of the subjects are well represented. The models are proven to be suitable for simulation of the RF electromagnetic field distribution., Conclusion: Image segmentation, creation of segmentation masks, and surface mesh generation are highly automated. Manual interventions remain for preparing the segmentation images prior to segmentation mask generation. The generated surfaces exhibit a single boundary per structure and are suitable inputs for simulation software., (© 2018 International Society for Magnetic Resonance in Medicine.)

Published
2019
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