Incremental Cross-view Mutual Distillation for Self-supervised Medical CT Synthesis
This addresses a domain-specific problem for medical imaging by enhancing CT scan resolution to aid disease diagnosis, though it is incremental as it builds on existing self-supervised and distillation techniques.
The paper tackles the problem of low intra-slice resolution in CT scans by proposing a self-supervised method to synthesize intermediate slices, improving inter-slice resolution without ground-truth data, and it outperforms state-of-the-art algorithms with clear margins in experiments.
Due to the constraints of the imaging device and high cost in operation time, computer tomography (CT) scans are usually acquired with low intra-slice resolution. Improving the intra-slice resolution is beneficial to the disease diagnosis for both human experts and computer-aided systems. To this end, this paper builds a novel medical slice synthesis to increase the between-slice resolution. Considering that the ground-truth intermediate medical slices are always absent in clinical practice, we introduce the incremental cross-view mutual distillation strategy to accomplish this task in the self-supervised learning manner. Specifically, we model this problem from three different views: slice-wise interpolation from axial view and pixel-wise interpolation from coronal and sagittal views. Under this circumstance, the models learned from different views can distill valuable knowledge to guide the learning processes of each other. We can repeat this process to make the models synthesize intermediate slice data with increasing inter-slice resolution. To demonstrate the effectiveness of the proposed approach, we conduct comprehensive experiments on a large-scale CT dataset. Quantitative and qualitative comparison results show that our method outperforms state-of-the-art algorithms by clear margins.