Title :
A statistical method for lung tumor segmentation uncertainty in PET images based on user inference
Author :
Chaojie Zheng;Xiuying Wang;Dagan Feng
Author_Institution :
Biomedical and Multimedia Information Technology research group, School of Information Technologies, University of Sydney, Australia
Abstract :
PET has been widely accepted as an effective imaging modality for lung tumor diagnosis and treatment. However, standard criteria for delineating tumor boundary from PET are yet to develop largely due to relatively low quality of PET images, uncertain tumor boundary definition, and variety of tumor characteristics. In this paper, we propose a statistical solution to segmentation uncertainty on the basis of user inference. We firstly define the uncertainty segmentation band on the basis of segmentation probability map constructed from Random Walks (RW) algorithm; and then based on the extracted features of the user inference, we use Principle Component Analysis (PCA) to formulate the statistical model for labeling the uncertainty band. We validated our method on 10 lung PET-CT phantom studies from the public RIDER collections [1] and 16 clinical PET studies where tumors were manually delineated by two experienced radiologists. The methods were validated using Dice similarity coefficient (DSC) to measure the spatial volume overlap. Our method achieved an average DSC of 0.878±0.078 on phantom studies and 0.835±0.039 on clinical studies.
Keywords :
"Positron emission tomography","Image segmentation","Tumors","Uncertainty","Inference algorithms","Lungs","Phantoms"
Conference_Titel :
Engineering in Medicine and Biology Society (EMBC), 2015 37th Annual International Conference of the IEEE
Electronic_ISBN :
1558-4615
DOI :
10.1109/EMBC.2015.7318841