A computational ghost imaging apparatus comprising a first electromagnetic radiation source such as a laser (100) and a control system configured to cause electromagnetic radiation from said first source to be applied to a selected plurality of three-dimensional portions of an atmospheric volume between a second electromagnetic radiation source (110) and object or region of interest (106) so as to heat or ionise the air within said selected portions and create an atmospheric spatial radiation modulator (108) of a specified pattern for causing said object or region of interest to be irradiated with spatially modulated electromagnetic radiation in said specified pattern, the apparatus further comprising a detector (104) for receiving electromagnetic radiation reflected from said object or region of interest (106), and a processing module for reconstructing an image of said object or region of interest using data output by said detector.
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