Table 1.

Scan conditions used in CT data acquisition.

Scanning Machine	Scanner #1	Scanner #2
Scanning Parameters
Tube voltage (kVp)	120	120
Pitch	1.375	1.2–1.3
X-ray Tube Current (mA)	395, 195, 100, 50	480, 260, 130, 65
CTDIvol (mGy)	23.4, 11.5, 5.9, 2.9	14.4, 7.2, 3.6, 1.8
Exposure Time (s)	0.7	0.5
Collimation Configuration	16 × 0.625 = 10 mm	16 × 0.75 = 12 mm
Reconstruction kernel	LUNG	B70f
Slice Interval (mm)	1.25	0.9
Slice Thickness (mm)	1.25	1
Pixel Spacing (mm)	0.7	0.7

Scanner #1 refers to the GE Lightspeed Pro model and Scanner #2 refers to the Siemens Sensation 16 model.