PAST PAPER

Question 1

1. With regard to radiation protection, if a patient received an absorbed dose of 16mGy at 2m from the source, what dose would they receive at 1m?
   a. 128 mGy
   b. 64 mGy
   c. 32 mGy
   d. 8 mGy

Answer 1

B) 64mGy

Question 2

2. With regard to image quality in computed tomography (CT), which of the following outcomes would you expect if selecting thinner slice thickness?
   a. Increased signal
   b. Increased spatial resolution
   c. Increase in volume averaging
   d. Reduced noise

Answer 2

d. reduced noise

Question 3

3. With regard to equipment used in CT, which of the following statements is NOT a desirable characteristic of an X-ray detector
   a. High dynamic range
   b. High efficiency
   c. Strong afterglow
   d. Fast response

Answer 3

c. strong afterglow

Question 4

4. With regard to CT, which of the following statements is correct when the pitch is increased:
   a. Spatial resolution increases and signal to noise ratio (SNR) increases
   b. Spatial resolution decreases and SNR decreases
   c. Spatial resolution decreases and SNR increases
   d. Spatial resolution increases and SNR decreases

Answer 4

b. spatial resolution decreases and SNR decreases

Question 5

5. With regard to CT, which of the following statements is correct when kVp is increased:
   a. Spatial resolution increases and signal to noise ratio (SNR) increases
   b. Spatial resolution decreases and SNR decreases
   c. Spatial resolution decreases and SNR increases
   d. Spatial resolution increases and SNR decreases

Answer 5

c. spatial resolution decrease and SNR increase

Question 6

6. If a radionuclide has a physical half-life of 6 hours and the initial dose is measured as 500 MBq, what will be the activity of the dose after two half-lives?
   a. 1000 MBq
   b. 250 MBq
   c. 750 MBq
   d. 125 MBq

Answer 6

d. 125

Question 7

7. Which of the following radionuclides is used in PET/CT imaging?
   a. Fluorine-18
   b. Strontium-89
   c. Technetium-99m
   d. Krypton-81m

Answer 7

a) fluorine-18

Question 8

8. Which of the following gamma camera collimators would be best used for RNI imaging using Iodine-131
   a. Low Energy High Resolution Collimator (LEHR)
   b. Medium Energy All-Purpose Collimator (MEAP)
   c. High Energy All-Purpose Collimator (HEAP)
   d. Low Energy All-Purpose Collimator (LEAP)

Answer 8

c. High Energy All-Purpose Collimator (HEAP)

Question 9

9. What is the photon energy range of a gamma camera scintillation crystal made of Sodium Iodide activated with Thallium (NaI(Tl)):
   a. 50keV – 400keV
   b. 100keV – 400keV
   c. 50keV – 300keV
   d. 100keV – 300keV

Answer 9

c. 50keV - 300keV