Table 2.

Processing times required by manual and automatic segmentation techniques

Method	Offline per Image (Semiautomatic)	Online per Image (Manual)	Offline for 5 Images (Semiautomatic)	Online for 5 Images (Manual)
Manual segmentation		1.5 h		7.5 h
Automatic segmentation
Baseline segmentation		1.5 h		1.5 h
Preregistration	2 min		10 min
Registration	4–6 h		20–30 h
Postregistration	2 min		10 min

Time spent by a human operator while delineating images (online) and by the computer (2.4 GHz Intel Xeon CPU, 2 GB RAM) during automatic processing (offline) is shown per image and for a series of five images.