An imaging system for imaging contents, components or composition of cargo or transported containers, the system comprising: an x-ray or gamma ray source having a source focal spot and being configured to emit a beam, the beam being an x-ray or gamma ray beam, respectively, and covering a vertical angle; a tunnel having a plurality of detectors, arranged in horizontally spaced apart linear arrays (2a-2g), wherein each linear array (2a-2g) is configured to receive, respectively, a portion (3a-3g) of the beam, each portion (3a-3g) being fan-shaped and configured to cover the vertical angle of the beam, wherein the linear arrays (2a-2g) are spaced apart by a horizontal angle (α) between approximately 3 to approximately 15 degrees about an axis vertically through the source focal spot; a translatable and rotatable platform configured to support cargo or a transported container and to move through the tunnel so that the cargo or the transported container crosses the portions (3a-3g) of the beam received by the linear arrays (2a-2g) when the x-ray or gamma ray source is emitting the beam, wherein the platform is configured to rotate so that the platform is horizontally translatable through the tunnel at multiple angles, wherein, when the source is emitting the beam and the platform is supporting cargo or a transported container, the platform is configured to translate the cargo or the transported container completely through the portions (3a-3g) of the beam received by the linear arrays (2a-2g) at a first angle, and to translate the cargo or the transported container completely through the portions (3a-3g) of the beam received by the linear arrays (2a-2g) at a second angle; and a computer (95, 96, 89) configured to receive linescan data from each of the linear arrays (2a-2g) of the plurality of detectors, wherein the linescan data corresponds to information collected by the linear arrays (2a-2g) from the portions (3a-3g) of the beam when the cargo or the transported container is being translated (S4, S6) completely through the portions (3a-3g) of the beam at the first angle and at the second angle, wherein the computer is configured to reconstruct a three-dimensional volumetric model of the cargo or the transported container by processing the linescan data from the linear arrays (2a-2g) received when the cargo or the transported container translates completely through the portions (3a-3g) of the beam at the first angle and by processing the linescan data from the linear arrays (2a-2g) received when the cargo or the transported container translates completely through the portions (3a-3g) of the beam at the second angle. an x-ray or gamma ray source having a source focal spot and being configured to emit a beam, the beam being an x-ray or gamma ray beam, respectively, and covering a vertical angle; a tunnel having a plurality of detectors, arranged in horizontally spaced apart linear arrays (2a-2g), wherein each linear array (2a-2g) is configured to receive, respectively, a portion (3a-3g) of the beam, each portion (3a-3g) being fan-shaped and configured to cover the vertical angle of the beam, wherein the linear arrays (2a-2g) are spaced apart by a horizontal angle (α) between approximately 3 to approximately 15 degrees about an axis vertically through the source focal spot; a translatable and rotatable platform configured to support cargo or a transported container and to move through the tunnel so that the cargo or the transported container crosses the portions (3a-3g) of the beam received by the linear arrays (2a-2g) when the x-ray or gamma ray source is emitting the beam, wherein the platform is configured to rotate so that the platform is horizontally translatable through the tunnel at multiple angles, wherein, when the source is emitting the beam and the platform is supporting cargo or a transported container, the platform is configured to translate the cargo or the transported container completely through the portions (3a-3g) of the beam received by the linear arrays (2a-2g) at a first angle, and to translate the cargo or the transported container completely through the portions (3a-3g) of the beam received by the linear arrays (2a-2g) at a second angle; and a computer (95, 96, 89) configured to receive linescan data from each of the linear arrays (2a-2g) of the plurality of detectors, wherein the linescan data corresponds to information collected by the linear arrays (2a-2g) from the portions (3a-3g) of the beam when the cargo or the transported container is being translated (S4, S6) completely through the portions (3a-3g) of the beam at the first angle and at the second angle, wherein the computer is configured to reconstruct a three-dimensional volumetric model of the cargo or the transported container by processing the linescan data from the linear arrays (2a-2g) received when the cargo or the transported container translates completely through the portions (3a-3g) of the beam at the first angle and by processing the linescan data from the linear arrays (2a-2g) received when the cargo or the transported container translates completely through the portions (3a-3g) of the beam at the second angle.