Imaging apparatus on a host platform having an external surface, the external surface comprising a first surface (S 1) facing a first direction and a second surface (S 2) facing a second direction, the second direction being different to the first, the apparatus comprising a first and second plurality of single pixel detectors (10; 101) distributed about said external surface such that the first plurality of single pixel detectors are distributed over the first surface (S 1) and the second plurality of single pixel detectors are distributed over the second surface (S 2), each single pixel detector being configured to receive radiation reflected by an object or region of interest and output a single value corresponding to a time interval, an image processing module for processing the single values output from the pixel detectors to generate two-dimensional image data representative of the object or region of interest, and for receiving said two-dimensional image data and reconstructing a three-dimensional image of said object or region of interest using a ghost imaging algorithm, a radiation source module including a radiation source comprising a structured light source comprising a laser and a spatial light modulator through which light from said laser passes before irradiating said object or region of interest wherein the radiation source module comprises a control device configured to adjustably direct an output of said radiation source onto an object or region of interest, the imaging apparatus being configured to determine which of the first or second surfaces are facing the region of interest, and activate the first plurality of single pixel detectors if the first surface (S 1) is facing the region of interest or activate the second plurality of single pixel detectors if the second surface (S 2) is facing the region of interest, a target acquisition device for detecting an object or region of interest and generating a signal configured to cause said control device to direct said radiation source output to irradiate said detected object or region of interest. a first and second plurality of single pixel detectors (10; 101) distributed about said external surface such that the first plurality of single pixel detectors are distributed over the first surface (S 1) and the second plurality of single pixel detectors are distributed over the second surface (S 2), each single pixel detector being configured to receive radiation reflected by an object or region of interest and output a single value corresponding to a time interval, an image processing module for processing the single values output from the pixel detectors to generate two-dimensional image data representative of the object or region of interest, and for receiving said two-dimensional image data and reconstructing a three-dimensional image of said object or region of interest using a ghost imaging algorithm, a radiation source module including a radiation source comprising a structured light source comprising a laser and a spatial light modulator through which light from said laser passes before irradiating said object or region of interest wherein the radiation source module comprises a control device configured to adjustably direct an output of said radiation source onto an object or region of interest, the imaging apparatus being configured to determine which of the first or second surfaces are facing the region of interest, and activate the first plurality of single pixel detectors if the first surface (S 1) is facing the region of interest or activate the second plurality of single pixel detectors if the second surface (S 2) is facing the region of interest, a target acquisition device for detecting an object or region of interest and generating a signal configured to cause said control device to direct said radiation source output to irradiate said detected object or region of interest. a control device configured to adjustably direct an output of said radiation source onto an object or region of interest, the imaging apparatus being configured to determine which of the first or second surfaces are facing the region of interest, and activate the first plurality of single pixel detectors if the first surface (S 1) is facing the region of interest or activate the second plurality of single pixel detectors if the second surface (S 2) is facing the region of interest, a target acquisition device for detecting an object or region of interest and generating a signal configured to cause said control device to direct said radiation source output to irradiate said detected object or region of interest.