The estimation of lumbar intervertebral disc volumes before and after exercise using the Cavalieri method

The standard MR protocol of the spine included sagittal T1weighted and T2-weighted fast spin echo. Volume measurements are made by using a transparent template to overlay a grid of regularly spaced points over MRI scans of randomly selected patients (Figure 1). This point is counted as the full contact of the counter. Counts are made three times. The double or middle number is used. The volume of an object appearing on a scan (V) is the product of the sum of points that fell on the object ( ) Pi Σ , the area associated with each point (ap), and the distance between scan slices (t) in cubic centimetres { } . . V Pi ap t =Σ .