Table 3. Summary of predictive self-supervised learning methods in medical imaging.

No.	Authors	Pretext task	Down-stream task
1	Zhang, Wang & Zheng (2017)	Slices ordering	Body parts recognition
2	Spitzer et al. (2018)	Geodesic distance prediction	Brain area segmentation
3	Bai et al. (2019)	Anatomical position prediction	Short-axis cardiac MRI segmentation long-axis cardiac MRI segmentation
4	Li et al. (2020b)	Jigsaw puzzle	Nuclei Segmentation Skin lesions segmentation
5	Taleb et al. (2021)	Jigsaw puzzle	Brain tumor segmentation Liver segmentation Prostate segmentation
6	Zhuang et al. (2019)	Rubik cube	Brain tumor segmentation Brain hemorrhage classification
7	Zhu et al. (2020a)	Rubik cube+	Brain tumor segmentation Brain hemorrhage classification
8	Nguyen et al. (2020)	Spatial awareness	Organ at risk segmentation Intracranial Hemorrhage detection