DRC Risk Assessment & Mitigation 3

Question 1

Which body tissue has the HIGHEST radiosensitivity among the following options?

Accepted Answer

Bone marrow

Answer

Bone marrow is highly radiosensitive because it contains rapidly dividing hematopoietic stem cells that are actively producing blood cells.

Question 2

A cone beam CT (CBCT) scan delivers significantly more radiation than a periapical radiograph. Under what circumstance is CBCT justified in a risk assessment framework?

Accepted Answer

When conventional 2D imaging cannot provide sufficient diagnostic information for the clinical question

Answer

CBCT is justified only when 3D information is necessary and cannot be obtained from conventional 2D imaging, given its substantially higher patient dose.

Question 3

The effective dose concept in radiation protection accounts for which of the following?

Accepted Answer

The absorbed dose weighted for tissue radiosensitivity and radiation type

Answer

Effective dose applies tissue-weighting factors to absorbed doses in different organs, allowing comparison of risk across different exposure scenarios.

Question 4

Which radiographic examination carries the highest effective radiation dose?

Accepted Answer

Full-mouth series (18 films, digital)

Answer

A full-mouth series of 18 digital images delivers the highest cumulative effective dose among routine dental radiographic surveys.

Question 5

A patient presents who is breastfeeding. What special radiographic precaution is required?

Accepted Answer

Standard lead apron and thyroid collar are sufficient; no additional precautions are needed

Answer

Dental X-rays do not affect breast milk, so standard shielding protocols are all that is required for breastfeeding patients.

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

DRC Risk Assessment & Mitigation 3