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13 Questions

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RADIOLOGY LECTURE 4 ~~~~

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Questions and Answers

What is the measure of effective dose (E) in radiation exposure?

Sievert (Sv) (correct)

Milligray (mGy)

Röntgen (R)

Gray (Gy)

Which method of imaging delivers significantly more radiation exposure?

Ultrasound

MRI scan

Chest X-ray

CT scan (correct)

What is the SI unit for measuring radiation absorbed dose (D)?

Röntgen (R)

Sievert (Sv)

Millisievert (mSv)

Gray (Gy) (correct)

What does the reference dose indicate in radiographic examinations?

A level that should not be exceeded Signup and view all the answers

What is a likely unit for natural background radiation dose measurements?

Millisievert (mSv) Signup and view all the answers

What is the effective dose (E) calculated by?

Multiplying the equivalent dose (H) by the tissue weighting factor (WT) Signup and view all the answers

Which of the following represents the highest radiation dosage level for dental X-rays?

CBCT (full jaw) Signup and view all the answers

Why is the accumulation of X-ray doses a concern in dental practice?

Frequent X-rays may increase the risk of malignancy over time. Signup and view all the answers

What is meant by 'dose limitation' in the context of radiation exposure?

Setting maximum allowable levels of radiation for individuals. Signup and view all the answers

What principle advocates for the use of the lowest dose possible in radiation exposure?

Optimization (ALARP) Signup and view all the answers

What is the maximum dose limit for non-classified workers like dentists?

6 mSv Signup and view all the answers

How are Diagnostic Reference Levels (DRLs) defined?

As guidelines to ensure procedures do not exceed set dose levels. Signup and view all the answers

What radiation quality weighting factor is assigned to X-rays and gamma rays?

1 Signup and view all the answers