Effect of Microstructure of Spongy Bone in Different Parts of Woodpecker’s Skull on Resistance to Impact Injury

Table 1

Definitions of various microstructural parameters analyzed in this study.

	Parameters abbrev.	Definition (units)
Bone volume fraction	BV/TV	Relative percentage of bone within 3D ROI (%); BV: bone volume; TV: tissue volume
Structural model index	SMI	Quantification of relative shape of trabeculae from rod-like to plate-like
Trabecular thickness	Tb.Th	Quantification of relative thickness of individual trabeculae within 3-D ROI (μm)
Trabecular number	Tb.N	Quantification of relative number of individual trabeculae within 3-D ROI (1/mm)
Trabecular separation	Tb.Sp	Quantification of relative spacing between individual trabeculae within 3-D ROI (μm)
Bone mineral density	BMD	3-D derivation of mineral density (g/cm^3)