A proof-of-principle device for producing isodose maps of the radiation field due to an arbitrary gamma-ray source distribution has been constructed. Borrowing methodology from medical computerized tomography imaging, radiation fields are scanned with a pair of collimated ionization chambers by a series of rotations and translations. Experimental considerations limit each scan to two carriage positions, resulting in highly distorted maps. By modeling the map distortion as the result of a linear, space invariant degrading function, an inverse filter was used to remove the distortion. Application of the inverse filter has proved fruitful, and high-quality accurate maps have been produced