Table 1.

CT Scan Parameters for Both Data sets

Parameters	Rectum Data Set	RIDER Data Set
Manufacturer	Philips Healthcare	GE Healthcare
Acquisition type	Helical	Helical
Tube voltage	120 kVp	120 kVp
Tube current	250 or 350 mAs	Range 165–549 mAs
Slice thickness	5 mm	1.25 mm
Pixel spacing	Range 0.98–1.25 mm	Range 0.51–0.91 mm
Pixels	512 × 512	512 × 512