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Table 3 Protocol Parameters and Reproducibility of Quantitative Measurements on 3 T MR: Comparison with previous 1.5 T MR studies

From: High resolution carotid black-blood 3T MR with parallel imaging and dedicated 4-channel surface coils

  3.0-T 1.5 T
[20, 22, 30]
Difference
Interpolated Pixel Size [mm 2 ] 0.25 mm × 0.25 mm = 0.0625 mm2 0.3 mm × 0.3 mm = 0.09 mm2 -31%
Scan Range [mm] 30 24 + 25%
Total Scan Time [minutes] 13:05 Protocol CM-
22:43 Protocol CM+
19:30 CM-
31:30 CM+
-33%
-28%
Scan Time per Slice [seconds]    
T1w 18.5 35.0 -47%
PD/T2w 6.1 15.0 -59%
TOF 4.8 9.6 -50%
Non-Diagnostic Exams [%] 1/38 [2.6%] 27/252 [10.7%]  
PAT factor 2
DCE = 4
1 +100%
Coefficient of Variation    
   a.) Lumen Area 1.5% 4.3%  
   b.) Wall Area 4.5% 5.8%  
   c.) Total Vessel Area 1.9% 3.3%  
   d.) NWI 3.0% n.a.  
ICC (95% CI)    
   a.) Lumen Area 1.00 (0.99-1.00) 0.99 (0.98-1.00)  
   b.) Wall Area 0.98 (0.93-1.00) 0.97 (0.95-0.99)  
   c.) Total Vessel Area 1.00 (0.99-1.00) 0.98 (0.97-1.00)  
   d.) NWI 0.88 (0.60-0.97) n.a.  
  1. Protocol CM- = no contrast media used, time for TOF, PDw, T2w and T1w images; CM+ = same as CM-, + contrast-enhanced T1w and dynamic contrast enhanced sequences added; PAT = Parallel Acquisition Technique; DCE = Dynamic Contrast Enhanced Sequences; ICC = Intra Class Correlation Coefficient; NWI = Normalized Wall Index; CI = Confidence Interval