Radiology · single question
Which method is MOST effective at reducing patient radiation exposure during dental radiography?
Show answer and explanation
Correct answer: C. Rectangular collimator
Rectangular collimator reduces the primary beam to sensor size — reduces exposure by up to 60% vs. round collimation. Most effective dose reduction technique per ALARA principles. Student's note confirms: 'Ryan de mental dental dice que la mejor manera es el rectangular collimator.'
- A. F-speed/digital sensors reduce exposure vs. D-speed, but collimator change provides greater overall reduction.
- B. Circular collimator exposes a larger area than the sensor — LESS effective than rectangular.
- C. CORRECT. Rectangular collimator = most effective radiation reduction method. Reduces primary beam to sensor size, cutting exposure up to 60%.
- D. Lead apron reduces scatter to body/thyroid but does NOT reduce the primary beam — important but not the most effective overall technique.