X-Ray Backscatter Imaging.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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This research proposes a new three-dimensional x-ray imaging technique. Radiographs are produced by using the x-ray flux backscattered by an object under inspection. Tomographic slices of the object can be produced in image planes perpendicular to the beam incidence. The imaging technique produces radiographic backprojections of the internal features of an object from a frontal perspective. This perspective is impossible to achieve with current computerized tomography techniques. Practical penetration depths of up to 5 cm of tissue equivalent material, and 12 in. aluminum, at 1 mm resolution are demonstrated with 100 KVP x-ray energies. Resolution of the system is governed by the diameter of a narrow x-ray beam which raster scans the object under study. Low x-ray energies penetrate and image only to shallow depths in the object, while increasing energies image progressively deeper. Subtraction of two backscatter images made at differing x-ray energies results in a tomographic view of the objects interior. The system features relatively low x-ray dose to the object under inspection. The x-ray beam is swept electronically to create near real-time backscatter images. Medical radiography could benefit from this x-ray technique by improved delineation of certain body features that are now difficult to image with conventional techniques.
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