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Table 3 Frequency distributions of responses to questionnaires (n = 72)

From: Knowledge of CT exposure parameters among Norwegian student radiographers

Questions True (%) False (%)
1. Reducing kVp would reduce the contrast resolution 41 (57) 31(43)
2. Increasing kVp by 50% is equivalent to doubling the mAs 39 (54) 33 (46)
3. kVp should be increased with patients having metallic implants 24 (33) 48 (67)
4. Doubling the mAs doubles the dose 55 (76) 17 (24)
5. Reducing the mAs reduces the noise 52 (72) 20 (28)
6. mAs should be increased as the body part thickness increases 24 (33) 48 (67)
7. ATCM is affected by improper patient positioning 51 (71) 21 (29)
8. ATCM decreases patient dose 49 (68) 23 (32)
9. ATCM increases the dose to obese patients 39 (54) 33 (46)
10. Decreasing the pitch degrades image quality 29 (40) 43 (60)
11. Increasing the pitch decreases the dose 38 (53) 34 (47)
12. Increasing the slice thickness decreases the dose 37 (51) 35 (49)
13. Decreasing the slice thickness reduces partial volume artefact 39 (54) 33 (46)
14. Increasing mAs decreases noise 57 (79) 15 (21)
15. Increasing kVp decreases noise 36 (50) 36 (50)
16. Increasing slice thickness increases noise 34 (47) 38 (53)
17. Increasing pitch increases noise 28 (39) 44(61)
18. A smoothing reconstruction kernel, increases the visualization of noise 25 (35) 47 (65)
19. Wider window settings, reduce the image contrast but also the visual perception of noise 27 (37) 45 (63)
20. Increasing the kVp from 120 to 140 kVp causes an increase in CTDI values of: 50 (69) 22 (31)
21. Which is the most informative index regarding the amount of dose that the patient would receive by the end of the examination?? 28 (39) 44 (61)