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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