Table 1 The 26 measurements that are used to characterize the microglial morphology
From: Ablation of Siglec-E augments brain inflammation and ischemic injury
Measurement | Definition |
|---|---|
Kurtosis | The fourth-order moment about the mean |
Min. gray level | Minimum gray values within the selection |
Median | The median value of the pixels in the image or selection |
Modal gray value | Most frequently occurring gray value within the selection |
Mean gray value | Average gray value within the selection |
Circularity |  = 4π × area/perimeter2 |
Solidity |  = Area/convex area |
Max. gray level | Maximum gray values within the selection |
Roundness |  = 4 × area/(π × major_axis2), or the inverse of the aspect ratio |
Average branch length | The average length of branches, in the corresponding units |
Aspect ratio |  = major_axis/minor_axis |
Standard deviation | Standard deviation of the gray values |
Maximum branch length | The maximum length of branches, in the corresponding units |
MinFeret | The minimum caliper diameter |
Feret’s diameter | The longest distance between any two points along the selection boundary |
Integrated density | The product of area and mean gray value |
Perimeter | The length of the outside boundary of the selection |
End-point pixels | Count of pixels if they have less than 2 neighbors |
Area | Area of selection in square pixels |
Skewness | The third order moment about the mean |
Branches | The number of branches |
Slab pixels | Count of pixels if they have exactly 2 neighbors |
Quadruple points | The number of triple points |
Triple points | The number of quadruple points |
Junctions | The number of actual junctions |
Junction pixels | Count of pixels if they have more than 2 neighbors |