Table 2 Questions and answers of the knowledge test in radiation safety
Question | Answers | Frequency (%) |
|---|---|---|
1. Which of the following radiological investigations uses X-ray? | MDCT | 91 (84.2) |
MRI | 3 (2.8) | |
PET | 14 (13.0) | |
2. Which of the following statements best describes the ALARA principle? | Dose parameters in MDCT | 13 (12.0) |
Estimation of organ dose | 22 (20.4) | |
Exact organ dose | 8 (7.4) | |
Minimum dose to achieve results | 65 (60.2) | |
3. Does patient weight affect the radiation dose that the patient is exposed to? | Yes | 93 (86.1) |
No, only in preterm | 11 (10.2) | |
No, never | 4 (3.7) | |
4. Which exam exposes the patient to a higher radiation dose? | Total body MDCT | 97 (89.8) |
Color-doppler | 0 (0.0) | |
Tc99 renal scintigraphy | 11 (10.2) | |
5. Which of the following radiological tests is associated with the longest radiation exposure time? | Renal scintigraphy | 11 (10.2) |
MRI | 17 (15.7) | |
MDCT | 21 (19.4) | |
PET-CT | 59 (54.6) | |
6. Which of the following amounts of CXRs corresponds to a radiation dose resulting from an abdominal MDCT study performed for young children (< 5 y/o)? | 0.5 CXR | 8 (7.4) |
1 CXR | 10 (9.3) | |
8 CXRs | 12 (11.1) | |
50 CXRs | 57 (52.8) | |
300 CXRs | 21 (19.4) | |
7. Which of the following numbers of CXRs corresponds to a radiation dose resulting from an MRI performed for young children (< 5 y/o)? | 0 chest X-ray | 70 (64.8) |
0.5 chest X-ray | 8 (7.4) | |
1 chest X-ray | 8 (7.4) | |
8 chest X-rays | 19 (17.6) | |
50 chest X-rays | 3 (2.8) | |
8. Can orthopantomography be performed safely during pregnancy? | No, never | 15 (13.9) |
Yes | 31 (28.7) | |
Yes, but wearing a shield | 62 (57.4) | |
9. Which of the following doses is the entrance surface dose recommended for a chest X-ray performed for a neonate? | 50 µGy | 69 (63.9) |
50 Gy | 34 (31.5) | |
600 Gy | 5 (4.6) | |
10. Which of the following minimum radiation doses is associated with a high probability damage to a fetus? | Less than 1 mSv | 13 (12.0) |
Approximately 1 mSv | 8 (7.4) | |
Approximately 3 mSv | 29 (26.9) | |
More than 50 mSv | 58 (53.7) |