Which of the following reflects a safety measure to minimize radiation exposure in radiologic imaging?

• A. Use ALARA principle, shielding, and optimization of technique; use alternative imaging when possible.
• B. Increase exposure factors to shorten exam time.
• C. Avoid shielding to prevent interference with image quality.
• D. Require all scans to be performed without any dose controls.

Answer: (A)

Minimizing radiation exposure in radiologic imaging hinges on keeping the dose as low as reasonably achievable while still meeting diagnostic needs. The best approach combines the ALARA mindset with shielding, optimization of technique, and considering alternative imaging when appropriate.

ALARA means tailoring exposure so the image is just good enough to answer the clinical question, avoiding unnecessary repeats, and resisting the urge to over-irradiate for speed. Protective shielding for radiosensitive tissues—such as the thyroid, gonads, and eyes—reduces unnecessary dose, especially in patients who are more vulnerable or require multiple studies. Optimizing technique involves selecting appropriate exposure factors for the patient’s size, using precise collimation to limit the beam to the region of interest, and applying automatic exposure control and correct positioning to minimize repeats and noise while preserving image quality. If a modality that does not use ionizing radiation can provide the needed diagnostic information, it should be chosen to eliminate dose altogether.

In contrast, simply increasing exposure factors to shorten exam time raises the dose, which is not a safety measure. Avoiding shielding misses a straightforward safeguard for sensitive tissues, and performing scans without any dose controls ignores essential safety practices.