Table 2.

Performance comparison of different models in spinal canal segmentation task.

Model/method	Candidate region extraction	Feature extraction network	Classifier	Jaccard score (IoU)
Faster R-CNN + Shallow U-Net	RPN (regional suggestion network)	CNN	–	0.85
R-CNN (benchmark method)	Selective search	AlexNet CNN	SVM	0.72
Fast R-CNN	Selective search	CNN	–	0.78
Shallow U-Net (used alone)	–	–	–	0.75