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Structure of the chest homogeneous phantom used to simulate different volumes of pulmonary inflammatory processes and healthy lung background. The homogeneous phantom was constructed of 4 acrylic slabs (2.54 cm of thickness), an air gap (5.08 cm of thickness) and 2 aluminum plates (1.0 and 2.0 mm of thickness). All of the plates used measured 30.5 cm × 30.5 cm. The PIP volumes were simulated by 10 steps of polyvinyl chloride placed in the center of the phantom.
