DHA Diagnostic Imaging & Radiology

Question 1

Which unit is used to measure radiation absorbed dose in tissue?

Accepted Answer

Gray (Gy)

Answer

Becquerel

Answer

Sievert (Sv)

Answer

Roentgen

Question 2

What does the acronym ALARA stand for in radiation protection?

Accepted Answer

As Low As Reasonably Achievable

Answer

Always Limit All Radiation Amounts

Answer

As Limited As Reasonably Applied

Answer

Avoid Large Areas of Radiation Always

Question 3

Which imaging modality uses magnetic fields and radiofrequency waves to produce images?

Accepted Answer

MRI

Answer

CT scan

Answer

PET scan

Answer

Fluoroscopy

Question 4

The standard diagnostic chest radiograph is taken in which projection?

Accepted Answer

Posteroanterior (PA)

Answer

Lateral

Answer

Oblique

Answer

Anteroposterior (AP)

Question 5

Which contrast agent is most commonly used to enhance MRI images?

Accepted Answer

Gadolinium

Answer

Barium sulfate

Answer

Iodinated contrast

Answer

Technetium-99m

Question 6

Which type of ionizing radiation has the greatest penetrating power?

Accepted Answer

Gamma rays

Answer

Alpha particles

Answer

Beta particles

Answer

Protons

Question 7

In nuclear medicine, the 'half-life' of a radiopharmaceutical refers to:

Accepted Answer

The time for half the radioactive atoms to decay

Answer

The time to deliver half the therapeutic dose

Answer

Half the energy emitted per scan

Answer

The time for half the drug to be metabolized