Table 4 Intra-system reliability results after scanning 3 human subjects 6 times with each system.

From: Reliability and validity of handheld structured light scanners and a static stereophotogrammetry system in facial three-dimensional surface imaging

 

3dMD (RMS in mm)

Artec Eva (RMS in mm)

Artec Space Spider (RMS in mm)

Person 1 (15 scan pairs)

0.17 ± 0.03

0.26 ± 0.09

0.13 ± 0.05

Person 2 (15 scan pairs)

0.33 ± 0.12

0.16 ± 0.08

0.14 ± 0.03

Person 3 (15 scan pairs)

0.18 ± 0.03

0.18 ± 0.08

0.18 ± 0.04

Mean difference ± SD

0.23 ± 0.08

0.20 ± 0.05

0.15 ± 0.02

Registration error

0.10

0.06

0.06

  1. RMS represents the mean difference between the scans for every person. The six scans of every person were compared in every possible combination which resulted in 15 scan pairs (1st scan vs. 2nd, 1st vs. 3rd, 1st vs. 4th, 1st vs. 5th, 1st vs. 6th, 2nd vs. 3rd, 2nd vs. 4th, 2nd vs. 5th, 2nd vs. 6th, 3rd vs. 4th, 3rd vs. 5th, 3rd vs. 6th, 4th vs. 5th, 4th vs. 6th, 5th vs. 6th). The intra-system reproducibility did not differ significantly between the systems (repeated measures one-way ANOVA, p = 0.498).
  2. RMS root mean square
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