Which factors contribute to repeat radiographs and how can you minimize them?

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Repeat radiographs come from several modifiable factors that affect diagnostic quality and patient dose. The key contributors are poor positioning, incorrect exposure, motion, and patient instruction. When positioning is off, anatomy may be misaligned or clipped, making the image nondiagnostic; this is addressed by using proper positioning techniques, accurate patient landmarks, and supports or spacers as needed. If exposure settings are not appropriate for the part and size, the image may lack sufficient contrast or be overexposed, so choosing the correct kVp and mA, using appropriate exposure controls, and checking the exposure indicator helps ensure a usable image.

Motion blurs the anatomy, reducing sharpness and detail, which is minimized by immobilization, using shorter exposure times when feasible, and giving clear, calm instructions to the patient to stay still during the shot. The way you communicate with the patient matters too—providing simple, precise guidance improves cooperation and reduces repeat. Immediate checks involve reviewing the image quality and exposure indicators while the patient is still present, making quick adjustments or re-aiming if necessary rather than proceeding blindly to the next image.

Other factors like equipment malfunction can contribute, but they’re not the sole cause. Merely extending exposure times to fix issues isn’t appropriate and can increase patient dose without solving positioning or motion problems.