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Fig. 3. —Graph shows fractal dimension computed using five threshold values and plotted versus logarithm of ratio of apparent tissue areas segmented at 15% and 35% of maximal pixel intensity. Note high correlation coefficient of r = 0.999 regardless of imaging technique or anatomy examined. Also note regression equation shows that fractal dimension and logarithm of area ratio are linearly related with proportionality constant at 1.181, which is only 0.06% deviation from theoretic predicted value of 1.180 plus negligible intercept of -0.0082. y = 1.181x-0.0082, n = 108, y = fractal dimension, x = ln (area ratio).