Spatially adaptive active contours: a semi-automatic tumor segmentation framework

Autor: Norbert Graf, Cristina Farmaki, Konstantinos Marias, Vangelis Sakkalis
Rok vydání: 2010
Předmět:
Computer science
0206 medical engineering
Biomedical Engineering
Scale-space segmentation
Health Informatics
Image processing
02 engineering and technology
Clinical correlation
Wilms Tumor
Statistics
Nonparametric
Image Processing
Computer-Assisted
0202 electrical engineering
electronic engineering
information engineering
Humans
Radiology
Nuclear Medicine and imaging
Computer vision
Chi-Square Distribution
business.industry
Segmentation-based object categorization
Spatially adaptive
Pattern recognition
General Medicine
Image segmentation
Image Enhancement
Magnetic Resonance Imaging
020601 biomedical engineering
Computer Graphics and Computer-Aided Design
Kidney Neoplasms
3. Good health
Computer Science Applications
020201 artificial intelligence & image processing
Surgery
Computer Vision and Pattern Recognition
Artificial intelligence
Semi automatic
business
Algorithms
Tumor segmentation
Zdroj: International Journal of Computer Assisted Radiology and Surgery
ISSN: 1861-6429
1861-6410
DOI: 10.1007/s11548-010-0477-9
Popis: Tumor segmentation constitutes a crucial step in simulating cancer growth and response to therapy. Incorporation of imaging data individualizes the simulation and assists clinical correlation with the predicted outcome. We adapted snakes to improve tumor segmentation including difficult cases with inherently inhomogeneous structure and poorly defined margins.Snakes are flexible curves, based on the parameter-controlled deformation of an initial user-defined contour toward the boundary of the desired object, through the minimization of a suitable energy function. Although parameter-adjustment can yield fairly good results in homogeneous regions, traditional snakes often fail to provide an accurate segmentation result when both rigid and very elastic behavior is needed simultaneously to delineate the true outline of the tumor. We developed and tested a spatially adaptive active contour technique by introducing local snake bending, to improve traditional snakes performance for segmenting tumors. The key point of our method is the use of adaptable snake parameters, instead of constant ones, to adjust the bending of the curve according to the local edge characteristics. Our algorithm discriminates image regions according to underlying image features, such as gradient magnitude and corner strength. More specifically, it assigns each region a different "localized" set of parameters, one corresponding to a very flexible snake, and the other corresponding to a very rigid one, according to the local image characteristics.Qualitative results on more than 150 real MR images, as well as quantitative validation based on agreement with an expert clinician's annotations of the true tumor boundaries, demonstrate our approach is highly efficient compared to traditional active contours and region growing. Due to the use of adaptable parameters in the snake evolution process, our approach outperforms the other two methods, and consistently follows an expert's annotations. Statistical tests indicated significant difference between the results produced by our approach and two other algorithms traditional snakes and region growing, while multiple comparison showed that our method consistently outperformed those algorithms, with an average overlap of 89%, over the entire data set, while traditional snakes were at 82.5% and region growing at 59.2%. Furthermore, we performed several tests that demonstrate our method's stability to different initial contours, as well as, to lower resolution images.Our adaptive snake algorithm can spatially adapt to diverse image characteristics, producing outlines that mimic the true tumor boundaries. Results in MR datasets are very close to an expert clinician's intuition about the tumor boundaries.
Databáze: OpenAIRE
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