Epiphyseal Fusion Analysis

ROI definition

An analysis of epiphyseal fusion begins with an alignment approval. If the phalangeal axis deviates from the vertical direction, the region is rotated. Then, the region is limited to the upper part of the epiphysis and metaphysis and subjected to wavelet decomposition

Features based on wavelet decomposition

The most important feature of the 2-dimentional separable wavelet transform is its ability to separate vertical, diagonal and horizontal structures of an image. The directional information can be derived from the wavelet angle that represents the local ratio of horizontal and vertical details. Two groups of features are used

1. based on the horizontal component (the advancement of epiphyseal fusion suppresses horizontal edges of bones).
2. based on the wavelet angle (orientation of bone edges changes with the advancement of fusion)

Decomposed ROI at different stages of fusion