How do patient positioning and technique affect dose and image quality?

• A. Positioning has no impact on dose.
• B. Technique only affects image color.
• C. Proper positioning aligns the anatomy with the beam, reduces the need for repeats, and minimizes exposure to surrounding tissues; improper technique increases dose and reduces quality.
• D. Repeats increase dose but not image quality.

Answer: (C)

Positioning and technique control how the beam interacts with the body and where the image is formed. When the patient is positioned so the anatomy of interest is aligned with the beam and stays within the collimated field, the X-ray passes through the right amount of tissue, producing a clear image with appropriate exposure. This alignment minimizes magnification and distortion and reduces scatter, which improves image quality while using optimal exposure factors. At the same time, good technique lowers the chance of needing repeats, since the image is more likely to be acceptable on the first try, cutting unnecessary dose to the patient. Conversely, improper positioning or technique can push the exposure higher than needed, increase magnification and blur, cause edge cut-offs or scatter, and necessitate repeats, all of which raise the patient’s dose and degrade image quality.