Accurate segmentation of tubular, network-like structures, such as vessels, neurons, or roads, is relevant to many fields of research. For such structures, the topology is their most important characteristic, e.g. preserving connectedness: in case of vascular networks, missing a connected vessel entirely alters the blood-flow dynamics. We introduce a novel similarity measure termed clDice, which is calculated on the intersection of the segmentation masks and their (morphological) skeletons. Crucially, we theoretically prove that clDice guarantees topological correctness for binary 2D and 3D segmentation. Extending this, we propose a computationally efficient, differentiable soft-clDice as a loss function for training arbitrary neural segmentation networks. We benchmark the soft-clDice loss for segmentation on four public datasets (2D and 3D). Training on soft-clDice leads to segmentation with more accurate connectivity information, higher graph similarity, and better volumetric scores.
In this paper we report the challenge set-up and results of the Large Scale Vertebrae Segmentation Challenge (VerSe) organized in conjunction with the MICCAI 2019. The challenge consisted of two tasks, vertebrae labelling and vertebrae segmentation. For this a total of 160 multidetector CT scan cohort closely resembling clinical setting was prepared and was annotated at a voxel-level by a human-machine hybrid algorithm. In this paper we also present the annotation protocol and the algorithm that aided the medical experts in the annotation process. Eleven fully automated algorithms were benchmarked on this data with the best performing algorithm achieving a vertebrae identification rate of 95% and a Dice coefficient of 90%. VerSe'19 is an open-call challenge at its image data along with the annotations and evaluation tools will continue to be publicly accessible through its online portal.
We propose an auto-encoding network architecture for point clouds (PC) capable of extracting shape signatures without supervision. Building on this, we (i) design a loss function capable of modelling data variance on PCs which are unstructured, and (ii) regularise the latent space as in a variational auto-encoder, both of which increase the auto-encoders' descriptive capacity while making them probabilistic. Evaluating the reconstruction quality of our architectures, we employ them for detecting vertebral fractures without any supervision. By learning to efficiently reconstruct only healthy vertebrae, fractures are detected as anomalous reconstructions. Evaluating on a dataset containing $\sim$1500 vertebrae, we achieve area-under-ROC curve of $>$75%, without using intensity-based features.
Recent studies on medical image synthesis reported promising results using generative adversarial networks, mostly focusing on one-to-one cross-modality synthesis. Naturally, the idea arises that a target modality would benefit from multi-modal input. Synthesizing MR imaging sequences is highly attractive for clinical practice, as often single sequences are missing or of poor quality (e.g. due to motion). However, existing methods fail to scale up to image volumes with high numbers of modalities and extensive non-aligned volumes, facing common draw-backs of complex multi-modal imaging sequences. To address these limitations, we propose a novel, scalable and multi-modal approach calledDiamondGAN. Our model is capable of performing flexible non-aligned cross-modality synthesis and data infill, when given multiple modalities or any of their arbitrary subsets. It learns structured information using non-aligned input modalities in an end-to-end fashion. We synthesize two MRI sequences with clinical relevance (i.e., double inversion recovery (DIR) and contrast-enhanced T1 (T1-c)), which are reconstructed from three common MRI sequences. In addition, we perform multi-rater visual evaluation experiment and find that trained radiologists are unable to distinguish our synthetic DIR images from real ones.
Robust localisation and identification of vertebrae, jointly termed vertebrae labelling, in computed tomography (CT) images is an essential component of automated spine analysis. Current approaches for this task mostly work with 3D scans and are comprised of a sequence of multiple networks. Contrarily, our approach relies only on 2D reformations, enabling us to design an end-to-end trainable, standalone network. Our contribution includes: (1) Inspired by the workflow of human experts, a novel butterfly-shaped network architecture (termed Btrfly net) that efficiently combines information across sufficiently-informative sagittal and coronal reformations. (2) Two adversarial training regimes that encode an anatomical prior of the spine's shape into the Btrfly net, each enforcing the prior in a distinct manner. We evaluate our approach on a public benchmarking dataset of 302 CT scans achieving a performance comparable to state-of-art methods (identification rate of $>$88%) without any post-processing stages. Addressing its translation to clinical settings, an in-house dataset of 65 CT scans with a higher data variability is introduced, where we discuss refinements that render our approach robust to such scenarios.
In this work, we report the set-up and results of the Liver Tumor Segmentation Benchmark (LITS) organized in conjunction with the IEEE International Symposium on Biomedical Imaging (ISBI) 2016 and International Conference On Medical Image Computing Computer Assisted Intervention (MICCAI) 2017. Twenty four valid state-of-the-art liver and liver tumor segmentation algorithms were applied to a set of 131 computed tomography (CT) volumes with different types of tumor contrast levels (hyper-/hypo-intense), abnormalities in tissues (metastasectomie) size and varying amount of lesions. The submitted algorithms have been tested on 70 undisclosed volumes. The dataset is created in collaboration with seven hospitals and research institutions and manually reviewed by independent three radiologists. We found that not a single algorithm performed best for liver and tumors. The best liver segmentation algorithm achieved a Dice score of 0.96(MICCAI) whereas for tumor segmentation the best algorithm evaluated at 0.67(ISBI) and 0.70(MICCAI). The LITS image data and manual annotations continue to be publicly available through an online evaluation system as an ongoing benchmarking resource.