Radiograph Reject Rate Target — MFDS Part 1 MCQ

Correct answer: E — Not more than 10%

The correct answer is E. UK dental radiography quality-assurance guidance sets a target of at least 90% of conventional film images being diagnostically acceptable. Consequently, no more than 10% should be rated diagnostically unacceptable. Image quality should be analysed regularly, with faults and any required repeat exposures recorded so that avoidable patient irradiation can be reduced. The 5% figure in option A applies to digital imaging, for which at least 95% of images should be diagnostically acceptable. The 15% and 20% thresholds are above the recommended limit for film images, while option D is incorrect because explicit performance targets are provided.

Reference: SDCEP Practice Support, Quality Assurance of Clinical Image Quality, current webpage (checked 2026): https://www.psm.sdcep.org.uk/topics/radiation-protection/quality-assurance/quality-assurance-of-clinical-image-quality/