Table 1. .

The preset cone-beam CT (CBCT) scan protocols.

	Low dose head	Standard dose head	Low dose thorax	Pelvis
X-ray voltage (kVp)	100	100	110	125
X-ray current (mA)	10	20	20	80
X-ray millisecond (ms)	20	20	20	13
Gantry rotation (deg)	200	200	360	360
Number of projections	360	360	655	655
Exposure (mAs)	72	145	262	680
Fan type	Full fan	Full fan	Half fan	Half fan
Bow-tie filter	Full	Full	Half	Half
Default pixel matrix	384 × 384	384 × 384	384 × 384	384 × 384
Dose CTDIw (mGy)	2	3.9	4.7	17.7
Recon. filter	Standard	Sharp	Standard	Standard
Slice thickness (mm)	2.5	2.5	2.5	2.5