Bone Morphometry¶
2D Parameters¶
Parameter Name |
Output |
Unit |
Task Type |
|---|---|---|---|
Tissue area |
T.Ar |
mm² |
|
Bone area |
B.Ar |
mm² |
|
Tissue perimeter |
T.Pm |
mm |
|
Cancellous bone perimeter |
Cn.Pm |
mm |
|
Cortical porosity |
Ct.Po |
1 |
|
Centroid x-coordinate |
centroid_x |
µm |
|
Centroid y-coordinate |
centroid_y |
µm |
|
Angle of major axis |
theta |
rad |
|
Maximum chord length from minor axis |
Rmin |
µm |
|
Maximum chord length from major axis |
Rmax |
µm |
|
Second moment of area around minor axis |
Imin |
µm⁴ |
|
Second moment of area around major axis |
Imax |
µm⁴ |
|
Product moment of area |
Ipm |
µm⁴ |
|
Section modulus around major axis |
Zmax |
µm³ |
|
Section modulus around minor axis |
Zmin |
µm³ |
|
Polar section modulus |
Zpolar |
µm³ |
|
Thickness |
th_mean |
mm |
|
Max feret diameter |
max_feret_diameter_mean |
µm |
|
Roundness |
roundness_mean |
1 |
|
Eccentricity |
eccentricity_mean |
1 |
|
Solidity |
solidity_mean |
1 |
|
3D Parameters¶
Parameter Name |
Output |
Unit |
Task Type |
|---|---|---|---|
Tissue volume |
TV |
mm³ |
|
Trabecular bone volume |
Tb.BV |
mm³ |
|
Trabecular bone volume/tissue volume |
Tb.BV/TV |
1 |
|
Tissue volume |
TV |
mm³ |
|
Cortical bone volume |
Ct.BV |
mm³ |
|
Cortical porosity |
Ct.Po |
1 |
|
Fractal dimension |
fractal_dimension |
1 |
|
Trabecular separation |
th_mean |
mm |
|
Trabecular thickness |
th_mean |
mm |
|
Radius of curvature |
radius |
mm |
|
Angle of curvature |
angle |
° |
|
Total chord length |
chord_length |
mm |
|
Distance chord to midshaft |
distance |
mm |
|
IPL Parameters¶
Many more parameters are available via Scanco IPL, for example:
Parameter Name |
Output |
Unit |
Task Type |
|---|---|---|---|
Tissue volume |
tv |
mm³ |
|
Bone volume |
ov |
mm³ |
|
Bone volume/tissue volume |
ov/tv |
1 |
|
Degree of anisotropy |
DA |
DA unit |
|
Trabecular number |
n_mean |
n_mean_unit |
|
Trabecular separation |
Sp |
Sp Unit |
|
Trabecular thickness |
Th |
Th Unit |
|
Connectivity density |
Connectivity Density |
Connectivity Density Unit |
|
Moment of inertia around longer axis |
Imin |
mm⁴ |
|
Moment of inertia around shorter axis |
Imax |
mm⁴ |
|
Center of mass x-coordinate |
CMx |
mm |
|
Center of mass y-coordinate |
CMy |
mm |
|
MOI around x-axis |
Ixx |
mm⁴ |
|
MOI around y-axis |
Iyy |
mm⁴ |
|
MOI |
Ixy |
mm⁴ |
|
Polar MOI = Ixx + Iyy |
pMOI |
mm⁴ |
|
MOI divided by max.extent |
Ixx/Cy |
mm³ |
|
MOI divided by max.extent |
Iyy/Cx |
mm³ |
|
Angle towards old x-Axis |
Angle |
° |
|
MOI around new axis divided by max.extent |
Imax/Cmax |
mm³ |
|
MOI around new axis divided by max.extent |
Imin/Cmin |
mm³ |
|
Cross sectional bone area |
BArea |
mm² |
|
Total area |
TArea |
mm² |
|
Bone area ratio |
BA/TA |
1 |
|
References¶
Dempster et al. Standardized nomenclature, symbols, and units for bone histomorphometry: a 2012 update of the report of the ASBMR Histomorphometry Nomenclature Committee. J Bone Miner Res. 2013;28(1):2-17. https://doi.org/10.1002/jbmr.1805
Parfitt et al. Bone histomorphometry: standardization of nomenclature, symbols, and units. Report of the ASBMR Histomorphometry Nomenclature Committee. J Bone Miner Res. 1987;2(6):595-610. https://doi.org/10.1002/jbmr.5650020617
Hildebrand et al. A new method for the model-independent assessment of thickness in three-dimensional images. Journal of Microscopy, 185: 67-75. https://doi.org/10.1046/j.1365-2818.1997.1340694.x
Hildebrand et al. Quantification of Bone Microarchitecture with the Structure Model Index. Comput Methods Biomech Biomed Engin. 1997;1(1):15-23. https://doi.org/10.1080/01495739708936692
