Table 4.

Linear measurement accuracy and precision in QT reflection imaging. Note, the bias values represent the measurement accuracy calculated as difference between actual values (measured by x‐ray) and the value measured by QT, and the percentage bias values are calculated as percentage ratio of bias and actual values. The “Measurement #” column identifies the numbered measurements in Fig. 9

Imaging plane	Measurement #	Measured by X‐ray (mm)	Measured QT (mm ± SD) (n = 5)	% SD (coefficient of variation) (n = 3)	Bias (mm)	% bias
Coronal	1	13.82	13.65 ± 0.17	1.28	−0.17	1.21
	2	30.39	30.59 ± 0.18	0.59	+0.13	0.44
	3	50.18	50.36 ± 0.14	0.28	+0.18	0.36
	4	66.52	66.78 ± 0.18	0.26	+0.26	0.38
	5	83.99	84.37 ± 0.18	0.22	+0.38	0.45
	6	101.19	101.65 ± 0.19	0.19	+0.46	0.45
			Mean coefficient of variation = 0.46		Mean % difference = 0.55
Axial	1	13.82	13.56 ± 0.16	1.18	−0.26	1.87
	2	30.39	30.17 ± 0.36	1.21	+0.22	0.73
	3	50.18	50.16 ± 0.30	0.60	−0.02	0.04
	4	66.52	66.49 ± 0.59	0.89	−0.04	0.06
	5	83.99	84.41 ± 0.66	0.78	+0.42	0.50
	6	101.19	100.83 ± 0.69	0.68	−0.36	0.35
			Mean coefficient of variation = 0.89		Mean % difference = 0.59
Sagittal	1	13.82	13.43 ± 0.34	2.52	−0.39	2.89
	2	30.39	29.92 ± 0.39	1.30	−0.47	1.55
	3	50.18	49.71 ± 0.31	0.63	−0.47	0.94
	4	66.52	66.26 ± 0.57	0.86	−0.26	0.40
	5	83.99	83.91 ± 0.06	0.08	−0.08	0.10
	6	101.19	100.61 ± 0.11	0.11	−0.58	0.57
			Mean coefficient of variation = 0.92		Mean % difference = 1.07