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Stress–strain index
・ Stress–strength analysis
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Stress–strain index : ウィキペディア英語版
Stress–strain index
The stressstrain index (SSI), of a bone, is a surrogate measure of bone strength determined from a cross-sectional scan by QCT or pQCT (radiological scan). The stress–strain index is used to compare the structural parameters determined by analysis of QCT/pQCT cross-sectional scans to the results of three point bending test.
==Definition==
It is calculated using the following formula:
SSI = \sum_^n }
Where:
*rmax is the distance of voxel from centre
*CD is the apparent cortical (bone) density
*ND is the normal (cortical bone) density
*ri is the pixel position from the centre
*a is the area of a pixel

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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