Abstract: To improve computerized tomography (CT) imaging quality, a priori information of the test object is developed by probing the surfaces thereof at a multiplicity of points sufficient to spatially locate and define the envelope of the test object cross section to be imaged. A CT scan of the test object is then performed, and the CT image reconstructed therefrom is corrected with this a priori information. To expedite a priori information development, the convex hull of the test object is constructed from X-ray projection data and fitted with the probe developed measurement data to define the cross section envelope.