A method of obtaining a series of images of a three-dimensional object.
The method includes the steps of transmitting pulsed terahertz (THz)
radiation through the entire object from a plurality of angles, optically
detecting changes in the transmitted THz radiation using pulsed laser
radiation, and constructing a plurality of imaged slices of the
three-dimensional object using the detected changes in the transmitted
THz radiation. The THz radiation is transmitted through the object as a
two-dimensional array of parallel rays. The optical detection is an array
of detectors such as a CCD sensor.