Coronary artery calcium score on low-dose computed tomography for lung cancer screening

Table 2 scan and reconstruction parameters

Parameters	gCCT	ngCCT
Scan parameters
Technique	Spiral	Spiral
kV	120	120
mAs	150	30
Gantry rotation time (ms)	330	330
Individual detector width (mm)	1.2	0.6
Number of detectors	20 × 2	32 × 2
ECG gating	Yes	No
Prospective ECG modulation of tube current	Yes	No
Table feed/s (mm)	14.4	86.4
Pitch	0.2	1.5
Scan range	Carina-Apex	Chest
DLP (mGy; mean ± SD)	116 ± 51	84 ± 16a
Effective dose (mSv; factor = 0.014; mean ± SD)	2.0 ± 0.9	1.2 ± 0.5a
Effective dose (mSv; factor = 0.014; median, IQR)	1.61; 1.15-2.0	1.13; 1.05-1.20a
Reconstruction parameters
Effective slice width (mm)	3.0	5.0
Reconstruction increment (mm)	1.5	5.0
FOV (mm)	140-160	250-300
Kernel filtering	B35f1	B30f(medium-smooth)

The Table shows the scan parameters for gCCT and ngCCT. gCCT vs ngCCT,

^aP < 0.05;

¹Dedicated filter for calcium scoring. gCCT: ECG gated cardiac computed tomography; ngCCT: Non-gated chest computed tomography; FOV: Field of view; ECG: Electrocardiogram; DLP: Dose length product.