In mobile radiography, what is the minimum source-to-skin distance (SSD)?

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Multiple Choice

In mobile radiography, what is the minimum source-to-skin distance (SSD)?

Explanation:
Distance matters in radiography because the dose at the skin drops as you move the x-ray source farther away, due to the inverse square law. In mobile imaging, keeping the tube at least a certain distance from the patient protects the skin from excessive exposure and also reduces the amount of scattered radiation that can reach the operator. The established minimum source-to-skin distance is 12 inches (30 cm); this is the smallest spacing allowed to balance safety with practical positioning of the tube, detector, and shielding. You can place the tube farther away and still obtain a good image, but you must not bring it closer than 12 inches.

Distance matters in radiography because the dose at the skin drops as you move the x-ray source farther away, due to the inverse square law. In mobile imaging, keeping the tube at least a certain distance from the patient protects the skin from excessive exposure and also reduces the amount of scattered radiation that can reach the operator. The established minimum source-to-skin distance is 12 inches (30 cm); this is the smallest spacing allowed to balance safety with practical positioning of the tube, detector, and shielding. You can place the tube farther away and still obtain a good image, but you must not bring it closer than 12 inches.

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