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The paper presents a three-dimensional imaging system for concealed object detection. The system uses interferometric imaging at terahertz frequencies. A three-dimensional spiral antenna array is used as the detection array. The data is collected at one array location at a time using an element that moves along the 3-D array line in order to prevent blockage. The data is processed using an accelerated computation hardware that matches the speed of the array element movement, and produces the image in real time. The system is simulated to show its advantage over the 2-D imaging system. An experiment is set to prove the concept.