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Fig. 4. Comparison between mean intercept length (MIL) and radon transform analysis
(RTA) methods for determining predominant trabecular orientation. (A)
Predominant orientations given by the MIL method (red cylinders) and the RTA
method (yellow lines) for all planes (x-y, x-z, y-z) of a
representative femoral head trabecular volume. Top row, volumes analyzed using
MIL, with RTA results superimposed. Bottom row, corresponding planar images
analyzed using the RTA method with predominant orientations shown. (B) Results
from each method for all femoral head volumes (N=4). Filled diamonds,
y-z and z-x results; open circles, x-y results;
solid line, least-squares regression, excluding x-y results
(N=8, r2=0.97, P<0.01). Broken line
indicates unity.
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