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Bush__The_Essential_Physics_for_Medical_Imaging - Biomedical ...

Bush__The_Essential_Physics_for_Medical_Imaging - Biomedical ...

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FIGURE 8-30. A: <strong>The</strong> mammography accreditationphantom is composed of a wax insert containing sixnylon fibers, five aluminum oxide speck groups (sixspecks in each group), and five disks simulating masses.Mean diameters of the objects are indicated. <strong>The</strong> correspondingradiograph of the wax insert shows their"undegraded" radiographic appearance. B: <strong>The</strong> waxinsert is placed in a well in a clear acrylic phantom ofdimensions listed in the diagram. <strong>The</strong> phantom isintended to mimic the attenuation characteristics of a"standard breast" of 4.2-cm compressed breast thicknessof 50% adipose and 50% glandular tissue composition.Note the "contrast disk" on top of the phantom, whichgenerates a contrast signal <strong>for</strong> evaluation of per<strong>for</strong>mance.C: Mammographic image of the composite phantomwith scatter and noise.

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