Before revision: Definition It is calculated using the following formula: 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 History and relation to moments of inertia It was developed by the manufacturer of a peripheral quantitative CT (pQCT) scanner, and is considered to be by some an improvement over the information provided by calculating the area moments of inertia and polar moments of inertia.
After revision: __TOC__Definition It is calculated using the following formula: 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 History and relation to moments of inertia It was developed by the manufacturer of a peripheral quantitative CT (pQCT) scanner, and is considered to be by some an improvement over the information provided by calculating the area moments of inertia and polar moments of inertia.