[Forschungsseminar-BSV] Forschungsseminar Computergrafik, Bildverarbeitung und Visualisierung

[Patrick Oesterling]

E I N L A D U N G

zum Forschungsseminar 'Computergrafik, Bildverarbeitung und 
Visualisierung' am Mittwoch, den 03. Dezember 2014, 13:15 Uhr, Raum 
P-701 im Paulinum am Augustusplatz.


Wir hören einen Vortrag auf Deutsch von:


Christian Lucas
Universität Leipzig

über seine Masterarbeit mit dem Titel

"Expectation Maximization for Probabilistic Segmentation"


zum Inhalt:

Atlas-based probabilistic classification is a proven method for organ 
segmentation in medical images. A recent approach includes coarse 
positioning and deformable registration of organ regions. However, the 
atlas-based classification does not adapt sufficiently to individual 
patient data.

This work investigates a patient-specific classification via expectation 
maximization to improve the segmentation. Estimation of the organ gray 
value distribution and location probability is iterated with 
optimization of the registration parameters.

The algorithm has been implemented in Bash and Python scripting 
language. It is evaluated on 297 CT images from different institutions 
and scanners on five organ groups, including lungs, heart, liver, 
spleen, kidneys, bladder, prostate, rectum, and femoral heads.

The method performs well on organs with distinctive gray value 
distribution, e.g. lungs, liver, or spleen (mean DICE coefficient >= 
0.85). The expectation maximization step improves segmentation results 
from the previous atlas steps. Organs with a widespread gray value 
range, two peaks in their gray value distribution, or similar structures 
in their spatial vicinity, e.g. as for femoral heads, cannot be 
sufficiently segmented with the current implementation.



Alle Interessierten sind im Namen von Professor Dr. Scheuermann herzlich 
eingeladen.

Mit freundlichen Grüßen,
Patrick Oesterling