1. A mobile inspection system for generating an image representation of target object using a radiation source, comprising: a foldable boom comprising a first vertical portion which is physically attached to said vehicle, a first horizontal portion, and a second vertical portion; a first detector array housing physically attached to the first horizontal portion of the foldable boom, wherein said first detector array housing contains a plurality of detectors; a second detector array housing physically attached to the first vertical portion of the foldable boom wherein the second detector array housing contains a plurality of detectors; and at least one source of radiation wherein said radiation source is fixedly attached to a distal end of the second vertical portion of said boom and wherein the radiation source can be placed in a first position that orients a zero degree center point of said radiation source toward a lower portion of the target object and in a second position that orients the zero degree center point of said radiation source toward an upper portion of the target object.