Which two factors are identified as reducing patient dose in radiographic technique when selecting from the options provided?

• A. Grid and Collimator
• B. Grid and High-speed screens
• C. Collimator and High-speed screens
• D. All three

Answer: (C)

Reducing patient dose comes from two practical actions: limiting the size of the X-ray field and using faster imaging systems. Collimation narrows the beam to the area of interest, which cuts down the amount of tissue exposed and also reduces scattered radiation that would otherwise require higher exposure to compensate. High-speed screens (or fast detector systems) are more sensitive and need less exposure to achieve a diagnostic image, directly lowering the dose delivered to the patient. A grid, while it improves image contrast by reducing scatter, requires higher exposure to maintain receptor signal, which increases patient dose. So the best combination for dose reduction is applying proper collimation and using high-speed imaging.