Table 2.

Linearity of QCBCT and CAL_CBCT images compared with QCT images for measuring BMD at various bone sites of interest.

Group	Bone site	QCT	QCBCT					CAL_CBCT
		Mean ± SD (mg/cm3)	Mean ± SD (mg/cm3)	Slope	r	R2	SEE (mg/cm3)	Mean ± SD (mg/cm3)	Slope	r	R2	SEE (mg/cm3)
	All	840.41 ± 192.69	860.06 ± 209.88	1.00	0.92	0.85	81.06	379.89 ± 125.49	0.32	0.49	0.24	109.32
A	Maxilla	842.72 ± 191.08	867.99 ± 223.18	1.08	0.92	0.85	85.53	398.40 ± 124.64	0.35	0.53	0.28	105.41
	Mandible	838.11 ± 194.70	852.13 ± 195.88	0.93	0.93	0.86	73.28	361.38 ± 123.88	0.29	0.46	0.21	110.00
B	Mx-Apical	762.13 ± 143.77	768.34 ± 159.92	0.95	0.86	0.73	81.84	328.68 ± 104.55	0.33	0.46	0.21	92.33
	Mx-Middle	807.34 ± 186.40	825.15 ± 216.57	1.09	0.94	0.88	75.71	388.77 ± 111.20	0.34	0.57	0.32	90.99
	Mx-Coronal	958.68 ± 183.46	1010.49 ± 214.07	1.05	0.90	0.81	93.15	477.75 ± 111.08	0.13	0.21	0.04	107.86
C	Mn-Coronal	910.29 ± 201.41	908.81 ± 208.98	0.98	0.95	0.90	66.84	423.46 ± 111.53	0.20	0.37	0.14	103.01
	Mn-Middle	820.87 ± 180.51	839.34 ± 178.25	0.90	0.91	0.83	73.39	373.39 ± 117.95	0.33	0.50	0.25	101.49
	Mn-Apical	783.16 ± 181.63	808.23 ± 188.05	0.94	0.91	0.83	77.08	287.29 ± 102.46	0.18	0.32	0.10	96.41
D	Mx-Incisor	857.72 ± 217.62	863.49 ± 242.40	1.05	0.95	0.89	78.36	368.75 ± 139.90	0.39	0.60	0.37	110.74
	Mx-Premolar	790.93 ± 173.10	835.05 ± 207.82	1.10	0.92	0.84	82.40	368.43 ± 103.36	0.31	0.52	0.27	87.95
	Mx-Molar	879.50 ± 170.07	905.44 ± 215.27	1.15	0.91	0.83	88.66	458.01 ± 106.70	0.25	0.40	0.16	96.97
E	Mn-Incisor	969.26 ± 216.89	965.32 ± 223.84	0.98	0.95	0.90	70.09	371.70 ± 159.45	0.33	0.45	0.21	141.04
	Mn-Premolar	786.32 ± 137.42	807.98 ± 149.50	0.91	0.84	0.71	80.48	339.58 ± 100.94	0.35	0.48	0.23	88.14
	Mn-Molar	758.75 ± 149.38	783.08 ± 154.69	0.93	0.90	0.81	67.00	372.84 ± 100.68	0.42	0.62	0.39	78.16

Slope, slope of the linear regression; r, correlation coefficient; R², coefficient of determination; SEE, standard error of estimation; Mx, maxilla; Mn, mandible.