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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