Which of the following is not a typical source of image artifact in radiography?

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Image artifacts are defects on the image that don’t correspond to the patient’s anatomy. The common culprits you’ll hear about are patient motion, which causes blur; hardware deterioration, which can produce streaks, bands, or dropout; and processing artifacts, which arise from the digital or film processing steps and can create odd textures or patterns. Calibration of the imaging system, while essential for accuracy and repeatable results, isn’t a typical source of an artifact. It’s a maintenance step that helps ensure the system’s output is correct; if calibration isn’t right, you’d expect systematic errors across images rather than a distinct artifact appearing in a single radiograph. So the option describing calibration is not a usual source of image artifact.