Shape boundary representation of the 9-APR and the third order B-spline schemes. The 9-anatomical points are marked by expert radiologist, Figure
(a) represents the marked made on (a1) synthetic and (a2) authentic vertebra image. Figure
(b) depicts the generated shape boundary using the 3rd order B-SR in which (b1) represents the 9-APR points, (b2) depicts the 27 equally spaced point over the boundaries measured from (b1) and (b3) depicts the resulting boundary of the vertebra using B-SR.