90 patients were enrolled in this study: 78 men and 12 women.
Mean age in first,
second and third group was 63±14,5 61±13,8 and 62±11,2 years,
respectively (p=0,696). Mean body weight was 81,3±12,69,
77,4±12,8 and 79,5±16,14 kg,
respectively (p=0,773).
Mean height - 1,69±0,27m,
1,7±0,3 and 1,70±0,43m,
respectively (p=0,859).
The BMI ranged from 21 to 38 kg/m2 and were not significantly different between groups (p=0,17,
0,614,
0,297,
respectively).
The mean intraarterial attenuation in 1,
2,
3 group was 315±6HU,
448±76HU,
334±33HU,
respectively,
but significantly higher in the second group (p=0,0003).
Noise in the second group (64±20HU) was significantly higher than that in the third group (45±14HU,
p=0,0002),
and first group (29±8,5HU,
p=0,0002).
The CNR in the second (6,64±2,3) and third (6,36±2,1) group was significantly lower than that in the first group (11,7,
p=0.0001).
Visual scores for the three arterial segments are summarized in Table 1.
There was a significant difference in visual scores for the aorto-iliac segment between standard and low-dose protocol (p=0,029 120kV vs.
80kV; p = 0,035 120 kV vs.
120 kV 50 mAs).
Visual scores for femoropopliteal and lower leg were not significantly associated with the protocol used (p<0,0001).
There were two cases of poor visualization in the aorto-iliac segment in the second group (80kV protocol,
patient’s BMI 34 and 37 kg/m2,
respectively) and one case of poor visualization in the aorto-iliac segment in the third group (120 kV 50 mAs protocol,
patient’s BMI 37 kg/m2).
Effective dose was 27,1±5,9mZv,
8,1±1,8mZv and 6,4±1,02mZv,
respectively,
differences were significant (p<0,0001).