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Haptic interaction with deformable models for 3D liver segmentation
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datoriserad bildanalys.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datoriserad bildanalys.
2007 (engelsk)Inngår i: Proceedings of MICCAI Workshop: Interaction in Medical Image Analysis and Visualization 2007, 2007, s. 41-48Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

We present a tool for interactive 3D liver segmentation using deformable surface models represented by simplex meshes. The interaction is performed directly in 3D with a haptic device. We use volume haptics to convey information about the volumetric data used for external force computations. This helps us to better understand the data and adjust the deformation weights. It is also possible to interact directly with the mesh during deformation. By pointing the haptic probe like a “torch” at the mesh, vertices and faces in a user specified neighbourhood are selected and forces can be applied to the selected sub-mesh only. We performed an experiment where 10 segmentations of the liver from CT data was performed. The segmentation results show high sensitivity and

specificity when compared to manual delineations made by a radiologist.

sted, utgiver, år, opplag, sider
2007. s. 41-48
Emneord [en]
segmentation, haptics, visualization
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-12682OAI: oai:DiVA.org:uu-12682DiVA, id: diva2:40451
Konferanse
Brisbane, 2007
Tilgjengelig fra: 2008-01-09 Laget: 2008-01-09 Sist oppdatert: 2018-01-12bibliografisk kontrollert
Inngår i avhandling
1. Visualization and Haptics for Interactive Medical Image Analysis
Åpne denne publikasjonen i ny fane eller vindu >>Visualization and Haptics for Interactive Medical Image Analysis
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Alternativ tittel[sv]
Visualisering och Haptik för Interaktiv Medicinsk Bildanalys
Abstract [en]

Modern medical imaging techniques provide an increasing amount of high-dimensional and high-resolution image data that need to be visualized, analyzed, and interpreted for diagnostic and treatment planning purposes. As a consequence, efficient ways of exploring these images are needed. In order to work with specific patient cases, it is necessary to be able to work directly with the medical image volumes and to generate the relevant 3D structures directly as they are needed for visualization and analysis. This requires efficient tools for segmentation, i.e., separation of objects from each other and from the background. Segmentation is hard to automate due to, e.g., high shape variability of organs and limited contrast between tissues. Manual segmentation, on the other hand, is tedious and error-prone. An approach combining the merits from automatic and manual methods is semi-automatic segmentation, where the user interactively provides input to the methods. For complex medical image volumes, the interactive part can be highly 3D oriented and is therefore dependent on the user interface.

This thesis presents methods for interactive segmentation and visualization where true 3D interaction with haptic feedback and stereo graphics is used. Well-known segmentation methods such as fast marching, fuzzy connectedness, live-wire, and deformable models, have been tailored and extended for implementation in a 3D environment where volume visualization and haptics are used to guide the user. The visualization is accelerated with graphics hardware and therefore allows for volume rendering in stereo at interactive rates. The haptic feedback is rendered with constraint-based direct volume haptics in order to convey information about the data that is hard to visualize and thereby facilitate the interaction. The methods have been applied to real medical images, e.g., 3D liver CT data and 4D breast MR data with good results. To provide a tool for future work in this area, a software toolkit containing the implementations of the developed methods has been made publicly available.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2008. s. 83
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 386
Emneord
Bildanalys, medical image analysis, haptic rendering, volume visualization, interactive segmentation, Bildanalys
Identifikatorer
urn:nbn:se:uu:diva-8409 (URN)978-91-554-7067-8 (ISBN)
Disputas
2008-02-08, Häggsalen, Ångströmlaboratoriet, Polacksbacken, Uppsala, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2008-01-18 Laget: 2008-01-18 Sist oppdatert: 2010-05-12bibliografisk kontrollert

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