Vocal tract imaging for the vowels /i/ and /a/ using both EBCT and MRI was carried out for one subject (29 yr old male, native of midwestern United States) using an Imatron C-150 electron beam CT scanner and a GE Signa 1.5 Tesla scanner, respectively. Each image set was analyzed using a general display and quantitation package called VIDA TM (Volumetric Image Display and Analysis). The image analysis consisted of segmenting the airspace from the surrounding tissue, obtaining a 3D vocal tract shape via shape based interpolation, and finally using an iterative bisection algorithm to determine the vocal tract area function. The results show that the 3D representations of the vocal tract shapes derived from EBCT show subtle deformations of the airway by articulatory structures and teeth that are not observed in the MRI based representations. Shaded surface renderings of each vocal tract shape and for each imaging technique are shown and the apparent trade-offs between the two imaging methods are discussed.