The three-dimensional (3-D) object data obtained from a scanner usually have unequal sampling frequencies in the x y and z directions. Generally the 3-D data is first interpolated between slices to obtain isotropic resolution reconstructed then operated on by object extraction and display algorithms. Several interpolation methods are available. Here three interpolation algorithms: hnear polynomial and shape methods are used for comparison. The performances of these three algorithms are compared based on the image quality and accuracy in volume measurement of the 3-D object. 1.