Shape terminology
Hull	the smallest convex shape that completely encloses the cell.
Endpoint	The terminus or end of a microglial process or branch.
Junction	The point at which the processes of a microglial cell divide or connect.
Slab voxels	The segment of a microglial process between an endpoint and junction.
Feature terminology
Foreground pixels	The pixels representing the cell after thresholding.
Maximum span across hull	The longest distance between any two points on the convex hull of the cell.
Area	The number of pixels that make up the cell.
Perimeter	The length of the cell’s outer boundary.
Width of bounding rectangle	The horizontal extent of the smallest rectangle that encloses the cell.
Height of bounding rectangle	The vertical extent of the smallest rectangle that encloses the cell.
Maximum radius from hull’s center of mass	The longest distance from the convex hull’s centroid (center of mass) to its outer boundary.
Mean radius	The average distance from the cell’s center to its outer boundary.
Diameter of bounding circle	The diameter of the smallest circle that completely encloses the cell.
Maximum radius from circle’s center of mass	The longest distance from centroid to the cell’s boundary.
Mean radius from circle’s center of mass	The average distance from the cell’s centroid to any pixel of the cell.
Density of foreground pixels in hull area	The fraction of the convex hull that is filled by the cell’s pixels
Span ratio of hull (major/minor axis)	The ratio of the convex hull’s longest axis to its shortest axis.
Circularity	How circular the cell is on a scale of 0 to 1.0, where 1.0 is a perfect circle.
Max/min radii from hull’s center of mass	The ratio between the longest and shortest distances from the convex hull’s centroid to its edge.
Relative variation (CV) in radii from hull’s center of mass	The coefficient of variation of the distances between the convex hull’s centroid and outer boundary.
Max/min radii from circle’s center of mass	The ratio between the longest and shortest distances from the bounding circle’s centroid to the cell’s outer boundary.
Relative variation (CV) in radii from circle’s center of mass	The coefficient of variation of the distances between the bounding circle’s centroid and outer boundary.
# of branches	The quantity of branch segments in the skeletonized structure.
# of junctions	The quantity of points where two or more branches converge in the skeleton.
# of end point voxels	The quantity of voxels at the ends of branches in the skeleton.
# of junction voxels	The quantity of voxels that are part of a junction.
# of slab voxels	The quantity of voxels that form the segments between junctions and endpoints in the skeleton.
# of triple points	The quantity of junctions in the skeleton where exactly three branches meet.
# of quadruple points	The quantity of junctions in the skeleton where exactly four branches meet.
Maximum branch length	The length of the longest continuous branch in the skeleton.
Average branch length	The mean length of all branches in the skeleton.