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Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is a powerful protocol for assessing tumour progression from changes in tissue contrast enhancement. Manual colorectal tumour delineation is a challenging and time consuming task due to the complex enhancement patterns in the 4D sequence. There is a need for a consistent approach to colorectal tumour segmentation in DCE-MRI and we propose a novel method based on detection of the tumour from signal enhancement characteristics of homogeneous tumour subregions and their neighbourhoods. Our method successfully detected 20 of 23 cases with a mean Dice score of 0.68 +/- 0.15 compared to expert annotations, which is not significantly different from expert inter-rater variability of 0.73 +/- 0.13 and 0.77 +/- 0.10. In comparison, a standard DCE-MRI tumour segmentation technique, fuzzy c-means, obtained a Dice score of 0.28 +/- 0.17.

Type

Journal article

Journal

Medical image computing and computer-assisted intervention : miccai ... international conference on medical image computing and computer-assisted intervention

Publication Date

01/2014

Volume

17

Pages

609 - 616

Keywords

Humans, Colorectal Neoplasms, Image Interpretation, Computer-Assisted, Magnetic Resonance Imaging, Image Enhancement, Sensitivity and Specificity, Reproducibility of Results, Algorithms, Artificial Intelligence, Pattern Recognition, Automated