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Table 1 Changes in deformation factor ni for the analyzed squares (smaller—0.05 m × 0.05 m and bigger—0.10 m × 0.10 m) for different environments (with and without water) and different distances (0.40 m, 0.35 m, 0.30 m) between the camera’s lens and analyze squares

From: A novel vision-based system for quantitative analysis of abdominal aortic aneurysm deformation

Object Environment Distance [m] Average deformation factor ni [-] P
Square 0.05 × 0.05 m Without water 0.30 1.00153 ± 0.00022 0.1837
With water 1.00150 ± 0.00022
Without water 0.35 1.00160 ± 0.00021 0.5499
With water 1.00159 ± 0.00017
Without water 0.40 1.00166 ± 0.00017 0.1020
With water 1.00169 ± 0.00015
Square 0.10 × 0.10 m Without water 0.30 1.00149 ± 0.00023 0.7750
With water 1.00149 ± 0.00023
Without water 0.35 1.00155 ± 0.00020 0.1931
With water 1.00158 ± 0.00019
Without water 0.40 1.00164 ± 0.00018 0.0084
With water 1.00170 ± 0.00016
  1. For each case, n = 220 analyses were performed. P values were calculated using Student’s t test