Table 2.

Deviation of the CT number of calcium at varying tube voltage and phantom size compared with the reference with a tube voltage of 120 kV and the standard reconstruction technique (Qr36)

	Deviation of the CT number of calcium
	Calcium-aware reconstruction technique			Standard reconstruction technique
Tube voltage	Small phantom	Medium phantom	Large phantom	Small phantom	Medium phantom	Large phantom
70	− 11.0% (− 9.9 to − 11.1%]	− 4.3% (− 4.0 to − 5.0%)	2.2% (1.8 to 3.5%)	60.5% (59.6 to 61.6%)	61.0% (60.4 to 62.0%)	63.6% (62.0 to 65.6%)
80	− 7.0% (− 6.7 to − 7.6%)	− 2.7% (− 2.3 to − 2.8%)	3.2% (2.6 to 3.8%)	40.1% (39.4 to 40.4%)	39.1% (39.0 to 40.1%)	40.8% (40.3 to 41.6%)
90	− 3.6% (− 3.4 to − 4.6%)	− 0.5% (− 0.9 to 0.7%)	3.7% (3.6 to 5.4%)	25.4% (25.3 to 26.3%)	24.4% (24.1 to 25.9%)	25.3% (24.2 to 26.5%)
100	− 2.4% (− 2.0 to − 2.9%)	0.6% (0.3 to 1.7%)	4.7% (3.3 to 5.6%)	14.9% (14.6 to 15.3%)	13.6% (13.3 to 15.0%)	14.0% (12.5 to 15.9%)
110	− 2.2% (− 1.7 to − 2.7%)	1.1% (0.8 to 1.3%)	5.2% (4.2 to 5.6%)	6.3% (5.7 to 6.9%)	5.8% (5.6 to 6.2%)	6.4% (5.4 to 6.7%)
120	− 1.5% (− 0.7 to − 2.0%)	2.1% (1.9 to 2.3%)	5.4% (5.1 to 6.0%)	0.0% (− 0.5 to 0.8%)	0.0% (− 0.2 to 0.2%)	0.0% (− 0.3 to 0.6%)
130	− 1.4% (− 0.6 to − 2.3%)	1.9% (0.9 to 2.1%)	5.8% (5.5 to 6.5%)	− 5.3% (− 4.5% to − 6.2%]	− 5.6% (− 5.4 to − 6.3%)	− 4.6% (− 4.0 to − 4.7%)
140	− 0.9% (− 0.8 to − 1.7%)	2.0% (0.8 to 2.9%)	4.7% (4.4 to 6.1%)	− 9.4% (− 9.3 to 10.1%)	− 9.6% (− 8.8 to 10.7%)	− 9.6% (− 8.6 to 10.0%)
150	− 1.1% (− 0.6 to − 1.8%)	1.9% (1.2 to 3.0%)	5.7% (5.2 to 6.5%)	− 13.0% (− 12.6 to − 13.6%)	− 13.2% (− 12.4 to − 13.8%)	− 12.3% (− 11.3 to − 12.5%)
Sn100	− 5.3% (− 4.3 to − 7.0%)	− 2.5% (− 1.4 to − 3.8%)	1.5% (0.2 to 3.7%)	− 16.5% (− 16.2 to − 17.9%)	− 13.9% (− 13.0 to − 14.8%)	− 11.1% (− 9.0 to − 11.8%)

Values given in median% (min%–max%)