Magnetresonanztomographie mit einer 3D-T2-gewichteten Turbo-Spin-Echo-Sequenz unterschiedlicher Auflösung : Darstellung anatomischer Details und pathologischer Veränderungen in axialen Aufnahmen, Maximum-Intensitäts-Projektionen und dreidimensionalen Volumenrekonstruktionen

In the present dissertation a very high-resolution three-dimensional T2-weighted turbo spin-echo sequence (3D-T2-TSE) with a matrix of 230 x 230 pixels was benchmarked in comparison to a highresolution sequence with a matrix of 128 x 128 pixels to the imaging of anatomical structures and pathological findings of the inner ear. Furthermore, we compared diagnostic quality of two postprocessing procedures, the maximum-intensity projection (MIP) and the three-dimensional volume-rendered image (3D reconstruction), when applied to both resolutions mentioned above.Based on a test group of 34 healthy patients the two imaging procedures have been compared with respect to the visibility of the anatomical details. The diagnostic significance of the different procedures was examined in a group consisting of 27 patients with different pathological findings and 26 patients with a semicircular canal dehiscence.Result of this study is a significantly better determination of the fine anatomical structures, especially of the nerves within the internal auditory canal, in the axial slices of the very highresolution sequence. Furthermore, the axial slices of the very high-resolution sequence lead to less false-positive results than all other procedures when judging the pathological findings of the membranous labyrinth. Looking to the postprocessing procedures, the MIP is inferior to the 3D reconstruction due to its strongly limited detail resolution and its limited diagnostic quality. The 3D reconstruction based on the high-resolution sequence proved significantly better judgement of the coarser inner ear structures like the semicircular canals and their ampullae. The pathological findings like the semicircular canal dehiscence, the large endolymphatic duct and sac as well as obliterations are better rendered concerning their spatial expansion and the involved anatomical structures. The MIP and 3D reconstruction of the very high-resolution sequence are strongly affected by low movement artefacts which decrease their interpretation.As a result of this study, the best representation of the membranous labyrinth is achieved in combining the axial slices of the very high resolution sequence with the 3D reconstruction of the highresolution sequence. The technical improvements of these procedures make it possible to introduce these methods into the clinical everyday life.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2006

Author dc:creator

• Martiny, Sandra

Contributors dc:contributor

• Günther, Rolf W.

• info:eu-repo/classification/ddc/610
• Medizin
• Labyrinth
• Innenohrkrankheit
• NMR-Tomographie
• Dehiszenzsyndrom
• Volumenrekontruktion
• Maximum-Intensitäts-Projektion
• Turbo Spin-Echo Sequenz

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123479%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:61861