Measurement Parameters
DEXA Measurements
| Measurement | Abbreviation | Unit |
|---|---|---|
| Bone Mineral Density | BMD | g/cm² |
| Bone Mineral Content (excluding skull) | BMC | g |
| Bone Area | BA | cm² |
| Fat Mass | FM | g |
| Lean Mass | LM | g |
| Body Length | Length | cm |
CT Trabecular Bone
| Measurement | Abbreviation | Unit |
|---|---|---|
| Bone Volume / Total Volume | BV/TV | % (no decimal values) |
| Trabecular Number | Tb.N | 1/mm |
| Trabecular Thickness | Tb.Th | µm |
| Trabecular Spacing | Tb.Sp | µm |
| Total Volume | TV | mm³ |
| Bone Volume | BV | mm³ |
| Bone Surface | BS | mm² |
| Bone Surface / Total Volume | BS/TV | mm²/mm³ |
| Bone Surface / Bone Volume | BS/BV | mm²/mm³ |
| Connectivity Density | Conn.D | 1/mm³ |
| Structure Model Index | SMI | dimensionless |
| Standard Deviation of Trabecular Thickness | Tb.Th.SD | µm |
| Standard Deviation of Trabecular Separation | Tb.Sp.SD | µm |
| Degree of Anisotropy | DA | dimensionless |
| Mean Intercept Length | MIL | dimensionless |
| Bone Mineral Density | BMD | mg/ccm HA |
| Tissue Mineral Density | TMD | mg/ccm HA |
CT Cortical Bone
| Measurement | Abbreviation | Unit |
|---|---|---|
| Total Area | Tt.Ar | mm² |
| Cortical Area | Ct.Ar | mm² |
| Cortical Area/Total Area | Ct.Ar/Tt.Ar | % |
| Cortical Thickness | Ct.Th | mm |
| Marrow Area | Ma.Ar | mm² |
| Periosteal Perimeter | Ps.Pm | mm |
| Endocortical Perimeter | Ec.Pm | mm |
| Moment of Inertia about anteroposterior axis | I_ap | mm⁴ |
| Moment of Inertia about the mediolateral axis | I_ml | mm⁴ |
| Maximum Moment of Inertia | I_max | mm⁴ |
| Minimum Moment of Inertia | I_min | mm⁴ |
| Polar Moment of Inertia | J | mm⁴ |
| Section Modulus (I_ap) | I_ap/C_ap | mm³ |
| Section Modulus (I_ml) | I_ml/C_ml | mm³ |
| Section Modulus (I_max) | I_max/C_max | mm³ |
| Section Modulus (I_min) | I_min/C_min | mm³ |
| Cortical Porosity | Ct.Po | % |
| Pore Number | Po.N | n |
| Total Pore Area | Po.A | mm² |
| Total Pore Volume | Po.V | mm³ |
| Average Pore Volume (Po.V/Po/N) | AvgPo.V | mm³ |
| Standard deviation of Pore Volume | PoV.SD | mm³ |
| Pore Density (Pore Number / Total Cortical Bone Volume) | Po.Dn | mm⁻³ |
| Bone Mineral Density | BMD | mg/ccm HA |
| Tissue Mineral Density | TMD | mg/ccm HA |
Bone Histomorphometry
| Measurement | Abbreviation | Unit |
|---|---|---|
| Bone Volume | BV/TV | % |
| Trabecular Thickness | Tb.Th | µm |
| Trabecular Number | Tb.N | #/mm |
| Trabecular Spacing | Tb.Sp | µm |
| Tissue Area | T.Ar. | mm² |
| Bone Area | B.Ar | mm² |
| Bone Surface | BS | mm²/mm³ |
| Osteoid Area | O.Ar | mm² |
| Osteoid Surface | OS/BS | % |
| Osteoid Volume | OV/BV | % |
| Eroded Surface | ES | % |
| Osteoclast Surface | Oc.S/BS | % |
| Osteoclast Number | Oc.N/BS | #/mm² |
| Quiescent Surface | QS | % |
| Osteoblast Surface | Ob.S/BS | % |
| Osteoblast Number | Ob.N/BS | #/mm² |
| Single Labelled Surface | sLS | % |
| Double Labelled Surface | dLS | % |
| Mineralizing Surface | MS/BS | % |
| Mineral Apposition Rate | MAR | µm/day |
| Bone Formation Rate | BFR | µm³/µm²/day |