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5 January 2001 Fabrication of two-dimensional x-ray antiscatter grids for mammography
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Anti-scatter grids are used in mammography to improve the contrast and signal-to-noise ratio by minimizing scattered x- rays. Most commercially available mammographic anti-scatter grids are one-dimensional, focused arrays of lead lamellae, sandwiched between more x-ray transparent spacer materials such as fiber or wood. Two-dimensional (2D), air-core, focused, anti-scatter grids are expected to be able to significantly reduce scatter-to-primary ratio and increase primary transmission in mammography. Two prototype unfocused, 2D, air-core nickel (Ni) anti-scatter grids were fabricated. The fabrication method uses x-ray lithography and electroplating, LIGA, which allows the fabrication of high aspect ratio metal parts. The metal parts are released from substrate. The grids have 20 micrometer thick walls and 300 micrometer period. This geometry permits 87.1% transmission of primary radiation. Each layer of the grid is assembled from nine smaller grid pieces. The assembly technique allows construction of larger grids. Grids of a desired grid height are obtained by stacking the appropriate number of layers, each layer approximately 250 - 350 micrometer thick. The first prototype is 1.48 cm X 1.48 cm and 2.00 mm high and the second prototype is 1.32 cm X 1.44 cm and 1.78 mm high. Electroplating with lead/tin will also be reported.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kevin Fischer, Bidhan Chadburi, Henry Guckel, and Cha-Mei Tang "Fabrication of two-dimensional x-ray antiscatter grids for mammography", Proc. SPIE 4145, Advances in X-Ray Optics, (5 January 2001);

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