. 2022 May 25;8(6):151. doi: 10.3390/jimaging8060151

Table A2.

Details of the computed morphological parameters.

Attribute	Explication
$Area (f_{25}$ )	Number of pixels in the studied region.
$Circularity (f_{26}$ )	This parameter compares the ROI shape and a cercle. It is computed as follows: $C = \frac{4 Π x A r e a}{P e r i m e t e r^{2}}$
$Eccentricity (f_{27})$	Eccentricity of the ellipse with the same second moments as the region.
$Orientation (f_{28})$	Represented by the angle between the x-axis and the maximum diameter of the best ellipse having the same second-moments as the region.
$Perimeter (f_{29})$	Distance around the region’s boundary.
$Solidity (f_{30})$	$Solidity = \frac{M a s k A r e a}{A r e a o f t h e c o n v e x e n v e l o p e}$
$Roundness (f_{31})$	This factor is used to describe the shape and can be represented by this formula: $\frac{4 \times A r e a}{Π \times m a x i m u m d i a m e t e r^{2}}$ -Roundness is close to 1 with circular shape -Roundness is close to $\frac{r_{1}}{r_{2}}$ in the case of elliptical shape -Otherwise: irregular shape Such as $r_{1}$ $and r_{2}$ represent respectively half of the minor axis and the major axis
$ENC (f_{32})$	Elliptical Normalized Circumference: We compare the bladder mask’s shape with ellipse closest to its shape. $ENC = \frac{B e s t e l l i p s e p e r i m e t e r}{R O I p e r i m e t e r}$
Ratio between the major and the minor axis lengths $(f_{33})$	This Ratio between the maximum width and the maximum length characterizes the external bladder shape.