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A quality-control phantom for digitization of radiographs

1990; Springer Science+Business Media; Volume: 3; Issue: 1 Linguagem: Inglês

10.1007/bf03168110

1618-727X

Ethan J. Halpern, Peter D. Esser, Edward L. Nickoloff, Philip O. Alderson,

Advanced X-ray and CT Imaging

Quality control is fundamental to the clinical application of digital radiography. A 14 x 17-in phantom radiograph was designed to test digital image quality by measurement of five parameters: high-contrast spatial resolution, low-contrast discrimination, linearity of gray-scale response, high-frequency noise, and geometric distortion. The phantom was used to evaluate the AT&T-Philips CommView picture archival and communications system (AT&T Bell Laboratories, West Long Branch, NJ; Philips Medical Systems, Shelton, CT). High-contrast resolution was found to be greater along the diagonal axis of the system than along either the horizontal or vertical axis. Problems with low-contrast discrimination and linearity of gray-scale response were identified. This phantom provides a simple tool for daily quality assurance testing and an objective standard for comparison of image quality between different digital radiography systems.