Which practice helps minimize patient radiation dose?

• A. Use the highest exposure to prevent retakes
• B. Use rectangular collimation and filtration
• C. Expose through the cheek for comprehension
• D. Skip shielding to reduce artifacts

Answer: (B)

Minimizing patient dose comes from restricting the beam and filtering out the least useful parts of the spectrum so only the necessary rays reach the tooth area.

Rectangular collimation tightens the X-ray beam to the size of the receptor, drastically reducing the area of tissue exposed. Less exposed tissue means less total radiation dose and less scatter, which helps preserve image quality while keeping dose low.

Filtration adds material to the beam that removes low-energy photons. Those photons would be absorbed by the patient and contribute to dose without improving the image, so filtering reduces dose while maintaining or even improving image contrast.

Together, these practices align with keeping the dose as low as reasonably achievable without compromising diagnostic information.

Higher exposure to prevent retakes ends up increasing dose and doesn’t guarantee fewer retakes, since many retakes stem from technique or positioning rather than just exposure level. Exposing through the cheek is not a standard or reliable approach and can undermine image quality. Skipping shielding removes a protective measure for sensitive tissues, which is not advisable when shielding can be used appropriately.