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The mathematical model consists of two x\u2010ray sources and one stationary detector plane. A closed form least\u2010squares solution is derived for 3D localization of feature points, particularly a biopsy needle tip, from a pair of 2D digital radiographs. Based on the least\u2010squares formula and its first order approximation, the 3D localization error is analyzed in terms of object location, measurement error, separation between the two x\u2010ray sources, and distance from the source to the detector. The stereo imaging and error estimation formulas are numerically simulated and experimentally validated. The data are in agreement with theoretical prediction. 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