model has located to its original location with coordinate trans- 
formation. On the lower right corner of Figure 8, an axial profile contours 
projected on to a plane is shown. In Figure 9, the same skin 
model has been obtained by volume rendering. Here composite 
technique has been used, 
ray casting 
  
Figure 6. Brain and tumour 
These surface models can be clipped from desired locations 
with implicit functions or with another surface model. In Figure 
7, brain model has clipped with a plane and the final clipped 
parts are shown. 
   
ray casting. 
pped part and test part of surach : Glipped gar ot suocu: 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Figure 7. Clipping brain in two parts 
The clipped parts of the brain are also surface models. So, every 
kind of the processing operations can be performed on these 
parts too. All of the above models have been produced from 
axial MR images. 
In figure 8, skin surface model is shown. This model has ob- In Figure 11 maximum intensity projection of Figure 10 volume 
tained from saggital CT slices. is shown. 
Piano Parametors 
i 54.150 jo 346 [6.1242 
| Normals (xy 7) 
  
Figure 8. Skin surface model and an axial profile 
254 - 
  
Figure 9. Volume model of skin 
Figure 10 shows interior parts of brain with shaded composite 
  
Figure 10. Interior brain volume model 
  
Figure 11. Maximum intensity projection