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Moscow, Russia

Gurzhiev S.N.,Roentgenprom Ltd. | Novikov V.P.,Roentgenprom Ltd. | Sokolov S.N.,Roentgenprom Ltd.
Biomedical Engineering | Year: 2012

Slices of density of an object reconstructed using tomosynthesis from a limited-angle projection are attractive as a medical diagnostic tool due to high resolution of such slices and much smaller, compared to full-angle CT, required radiation dose and cost of instrument manufacture. However, the incompleteness of the projection sets leads to reconstruction artifacts that look like smeared (or repeated) and faded images of actual objects lying in other slices and requires reconstruction methods tolerant to such incompleteness and convenient for possible use of additional information about the object for the suppression of artifacts. The reconstruction method of folded projections, which is advantageous for limited-angle projection sets, is suggested. Examples of reconstructed slices are given for scanning angles 40, 60, and 90 degrees. A specially designed plastic phantom containing metallic inclusions producing strong artifacts was used. The study of these and other reconstruction results in various geometric and noise conditions indicates that the tomosynthesis option producing images of acceptable quality can be implemented in the standard ProGraph-7000 X-ray apparatus and may have considerable area of application. © 2012 Springer Science+Business Media, Inc. Source


Gurzhiev S.N.,Roentgenprom Ltd. | Novikov V.P.,Roentgenprom Ltd. | Sokolov S.N.,Roentgenprom Ltd.
Biomedical Engineering | Year: 2012

Tomosynthesis of an anthropomorphic head phantom using the ProGraf-7000 apparatus is discussed. The sections of the immobile head phantom were reconstructed from images obtained in the ProGraf-7000 apparatus using special software and system radiation source-digital matrix detector. Tomosynthesis parameters were optimized using two series of tomographic images obtained at equal anode voltages, imaging angles, and angular intervals. The series differed in exposure time (series 1 - twice-longer exposure). The tomosynthesis imaging quality was increased using additional tomosynthesis series (pixel subtraction or elimination). © 2012 Springer Science+Business Media, Inc. Source

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