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A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
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The crystallography image is from File:Lysozym diffraction.png by user:Del45. The mammography image is from File:40F MLO DMMG.png by Nevit Dilmen (talk). The CT image is from File:Ct-workstation-neck.jpg by en:User:ChumpusRex. The luggage scanner image is from File:Luggage screening at VTBS.JPG by user User:Mattes. Author: Ulflund: Other versions
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Bamboo sign; Banana sign; Bat wing appearance; Bear paw sign; Beveled edge sign; Bird of prey sign; Bite sign; Black pleura sign; Blade of grass sign (also known as Flame sign); Blumensaat's line