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The correct order of radiation dose from highest to lowest is:
Barium Enema, Lumbar spine, KUB, Chest
KUB, Chest, Barium Enema, Lumbar spine
Chest, KUB, Lumbar spine, Barium Enema
Chest, Barium Enema, KUB, Lumbar spine
The correct answer is: Barium Enema, Lumbar spine, KUB, Chest
The correct response reflects the understanding of typical radiation doses associated with various imaging procedures. When considering the radiation dose from highest to lowest, a barium enema generally delivers a higher dose because it involves a comprehensive evaluation of the gastrointestinal tract, which requires more extensive imaging. The lumbar spine examination also tends to result in a significant dose due to the thickness of the vertebrae and the need for clearer imaging. The kidney, ureter, and bladder (KUB) exam usually has a moderate dose, as it requires imaging of the abdomen and pelvis without the need for additional contrast agents, but still retains a certain level of radiation exposure. The chest X-ray, typically the lowest in dose among these procedures, is designed to acquire quick images of the thoracic cavity with less tissue mass involved compared to abdominopelvic exams. Thus, the rationale for the sequence in the chosen option captures the standard practices and average doses used for these common radiographic studies. Understanding the dose hierarchy is essential in radiography for ensuring patient safety and optimizing imaging protocols.