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A phantom for dose-image quality optimization in chest radiography

Applied Physics Department, Konstantin Preslavsky University, 9712 Shumen, Bulgaria

View larger version (53K): [in a new window]   Figure 1. Schematic view of the modified LucAl chest phantom. (a) Standard LucAl chest phantom. (b) Anthropomorphic insert. (c) Image quality test (IQT) plate containing low and high contrast objects as described in the text. PMMA, polymethyl-methacrylate; Al, aluminium.

View larger version (132K): [in a new window]   Figure 2. Radiograph of the anthropomorphic LucAl chest phantom.

View larger version (15K): [in a new window]   Figure 3. Variation of the image quality indices with the optical density (OD) in the lung area ODlung for posteroanterior chest radiography at constant beam quality (70 kVp and 1 mm aluminium added filter). (a) Areal contrast index Ca in the lung, cardiac and diaphragmal areas and in the ribs. •, lung; , cardiac; *, subdiaphragmal; +, ribs. (b) Low contrast visualization index Plow for the lung, cardiac and diaphragmal areas and high contrast visualization index Phigh in lung field. •, Plow lung; , Phigh lung; , Plow cardiac; *, Plow subdiaphragmal.