Effect of thresholding technique on noise in the in vivo dynamic bone histomorphometry measurements (as measured based on repeated, day 0 scans) of (A) bone formation/resorption volume, (B) average thickness of apposition/erosion site, and (C) formation/resorption surface area. *: significantly different from original filter and threshold (sigma=1.2, support=2, threshold=565 mgHA/cm3).