Method of Individual Adjustment for 3D CT Analysis: Linear Measurement

Table 1

Comparison of absolute and percentage differences for linear measurements between real values and PACS measurements.

Plane	Measurement	Absolute error				Significance		Percentage error				Significance
		Mean Dif	SD	95% confidence interval				Mean Dif	SD	95% confidence interval
				Lower	Upper		value			Lower	Upper		value
G0-Me (Lt.)	1		0.275		0.122		0.106		4.072		2.763		0.165
	2		0.258		0.105		0.099		3.788		2.39		0.151
	3		0.214		0.041		0.068		2.671		0.354		0.062
G0-Me (Rt.)	1		0.161		0.039		0.074		1.973		0.31		0.064
	2		0.242		0.187		0.201		4.395		5.149		0.463
	3		0.232		0.154		0.161		3.625		3.403		0.283
B~Pg	1		0.257		0.424		0.914		12.736		20.85		0.933
	2		0.286		0.487		0.835		16.844		31.908		0.587
	3		0.293		0.479		0.937		16.604		30.097		0.688
N~A	1		0.212		0.235		0.406		4.063		4.711		0.451
	2		0.291		0.383		0.621		6.516		9.846		0.883
	3		0.272		0.337		0.535		5.484		7.502		0.685
Orbital wall side to side	1		0.092		0.234		0.154		1.01		2.474		0.184
	2		0.067		0.166		0.17		0.663		1.712		0.142
	3		0.044		0.154		0.03		0.386		1.583		0.015
P0~zygomatic suture	1		0.299		0.084		0.079		6.283		1.666		0.077
	2		0.391		0.259		0.161		12.945		15.34		0.476
	3		0.353		0.174		0.115		9.543		8.101		0.234

Absolute error = PACS measurements − real values.
Percentage error = (PACS measurements − real values)/real values × 100.