Multi-modal Vertebra Segmentation from MR Dixon for Hybrid Whole-Body PET/MR
In this paper, a novel model-based segmentation of the vertebrae is introduced that uses multi-modal image features from Dixon MR images (i.e. water/fat separated). Our primary application is the segmentation of the bony anatomy for the generation of attenuation maps in hybrid PET/MR imaging systems. The focus of this work is on the geometric accuracy of the segmentation from MR. From ground-truth structure delineations on training data sets, image features for a model-based segmentation are trained on both the water and fat images from the Dixon series. For the actual segmentation, both features are used simultaneously to improve both robustness and accuracy compared to single image segmentations. The method is validated on 25 patients by comparing the results to semi-automatically generated ground truth annotations. A mean surface distance error of 1.69 mm over all vertebrae is achieved, leading to an improvement of up to 41 % compared to using a single image alone.
KeywordsThoracic Vertebra Segmentation Accuracy Mesh Triangle Ground Truth Annotation Generalize Hough Transform
We thank Bénédicte Delattre and the Hôpitaux Universitaire de Genève, in particular Prof. Osman Ratib, for providing us with the Dixon MR image data.
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