Which combination best reduces a patient’s exposure to radiation during diagnostic imaging?

Which combination best reduces a patient’s exposure to radiation during diagnostic imaging?

• A. Use time optimization, maintain distance, employ shielding, and proper equipment positioning.
• B. Increase exposure time and stand closer to the patient.
• C. Rely solely on lead aprons while staying at the same distance.
• D. Ignoring positioning and using minimal shielding.

Answer: (A)

Reducing patient radiation exposure relies on the principle of ALARA—as low as reasonably achievable—through four practical actions: minimize exposure time, maximize distance from the source, use shielding, and position the equipment and patient carefully to limit the beam to the area of interest. Shorter exposure time directly lowers the dose; keeping distance from the X-ray source reduces dose according to the inverse square law; shielding (such as lead aprons and thyroid shields) blocks scatter and protects sensitive tissues; and precise positioning with proper collimation confines the beam to the necessary area, reducing the need for repeats. This combination yields the lowest possible patient dose. The other approaches fall short because increasing exposure time and getting closer to the patient raise the dose; relying only on lead aprons ignores shielding for other tissues and cannot prevent unnecessary exposure or repeats; and ignoring positioning or using minimal shielding leads to larger doses and more retakes.

Reducing patient radiation exposure relies on the principle of ALARA—as low as reasonably achievable—through four practical actions: minimize exposure time, maximize distance from the source, use shielding, and position the equipment and patient carefully to limit the beam to the area of interest. Shorter exposure time directly lowers the dose; keeping distance from the X-ray source reduces dose according to the inverse square law; shielding (such as lead aprons and thyroid shields) blocks scatter and protects sensitive tissues; and precise positioning with proper collimation confines the beam to the necessary area, reducing the need for repeats. This combination yields the lowest possible patient dose.

The other approaches fall short because increasing exposure time and getting closer to the patient raise the dose; relying only on lead aprons ignores shielding for other tissues and cannot prevent unnecessary exposure or repeats; and ignoring positioning or using minimal shielding leads to larger doses and more retakes.