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Qualification and Stability of a Computed Tomography System for Small Parts Inspection

Los Alamos National Laboratory (LANL) has been doing Research & Development on digital radiography (DR) and computed tomography (CT) for many years. Recently, DR/CT processes have needed to be qualified for production use. All system variables must be addressed, established, documented, and tracked. Part of the qualification is performing a system baseline characterization. Periodic stability tests comparing results to the baseline are then performed to ensure the system is operating within acceptable limits. DR and CT spatial resolution and contrast sensitivity, and DDA detector offset, are performed initially and then repeated on a weekly basis to ensure the digital detector array is operating within tolerance. The tests have been also used to qualify a second identical system by comparison to the first system.

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