Basic | ±10 Hz | ±20 Hz | ±30 Hz | ±40 Hz | ±50 Hz | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean grade (SD) | Mean grade (SD) | Compared to the basic images | Mean grade (SD) | Compared to the basic images | Mean grade (SD) | Compared to the basic images | Mean grade (SD) | Compared to the basic images | Mean grade (SD) | Compared to the basic images | ||||||||||||||||
Better | Worse | Equal | P | Better | Worse | Equal | P | Better | Worse | Equal | P | Better | Worse | Equal | P | Better | Worse | Equal | P | |||||||
Device A (n = 20) | ||||||||||||||||||||||||||
Internal auditory canal | ||||||||||||||||||||||||||
Facial nerve | 1.95 (0.22) | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | |||||
Cochlear nerve | 2.00 (0.00) | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | |||||
Superior vestibular nerve | 1.95 (0.22) | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | |||||
Inferior vestibular nerve | 2.00 (0.00) | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | |||||
Cochlea | ||||||||||||||||||||||||||
Cochlear turn | 1.65 (0.49) | 1.60 (0.60) | 1 | 1 | 18 | 1.000 | 1.75 (0.44) | 2 | 0 | 18 | 1.000 | 1.85 (0.37) | 4 | 0 | 16 | 0.625 | 1.75 (0.44) | 4 | 2 | 14 | 1.000 | 1.70 (0.47) | 3 | 2 | 15 | 1.000 |
Modiolus | 2.00 (0.00) | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 1 | 19 | 1.000 | ||||
Spiral lamina | 0.90 (0.31) | 1.10 (0.55) | 3 | 0 | 17 | 1.000 | 1.00 (0.46) | 2 | 0 | 18 | 1.000 | 1.10 (0.55) | 3 | 0 | 17 | 1.000 | 0.90 (0.31) | 0 | 0 | 20 | 1.00 (0.46) | 2 | 0 | 18 | 1.000 | |
Vestibule | 1.05 (0.22) | 1.05 (0.22) | 0 | 0 | 20 | 1.05 (0.22) | 0 | 0 | 20 | 1.05 (0.22) | 0 | 0 | 20 | 1.20 (0.41) | 3 | 0 | 17 | 1.000 | 1.25 (0.44) | 4 | 0 | 16 | 0.625 | |||
Semicircular canals | ||||||||||||||||||||||||||
Superior | 0.90 (0.72) | 1.15 (0.67) | 5 | 0 | 15 | 0.313 | 1.50 (0.51) | 11 | 0 | 9 | 0.005a | 1.55 (0.51) | 12 | 0 | 8 | 0.002a | 1.65 (0.49) | 14 | 0 | 6 | < 0.001a | 1.65 (0.49) | 13 | 0 | 7 | 0.001a |
Posterior | 1.40 (0.88) | 1.50 (0.69) | 3 | 1 | 16 | 1.000 | 1.50 (0.51) | 6 | 4 | 10 | 1.000 | 1.70 (0.47) | 5 | 2 | 13 | 1.000 | 1.80 (0.41) | 6 | 0 | 14 | 0.156 | 1.70 (0.47) | 5 | 2 | 13 | 1.000 |
Horizontal | 1.10 (0.79) | 1.60 (0.68) | 9 | 0 | 11 | 0.020a | 1.80 (0.41) | 12 | 0 | 8 | 0.002a | 1.75 (0.44) | 11 | 0 | 9 | 0.005a | 1.90 (0.31) | 13 | 1 | 6 | 0.007a | 1.75 (0.44) | 12 | 1 | 7 | 0.015a |
Device B (n = 20) | ||||||||||||||||||||||||||
Internal auditory canal | ||||||||||||||||||||||||||
Facial nerve | 1.95 (0.22) | 1.95 (0.22) | 0 | 0 | 20 | 1.90 (0.31) | 0 | 1 | 19 | 1.000 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 0 | 20 | ||||
Cochlear nerve | 2.00 (0.00) | 2.00 (0.00) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 1 | 19 | 1.000 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | ||||
Superior vestibular nerve | 1.95 (0.22) | 1.90 (0.31) | 0 | 1 | 19 | 1.000 | 1.85 (0.37) | 0 | 2 | 18 | 1.000 | 1.90 (0.31) | 0 | 1 | 19 | 1.000 | 1.90 (0.31) | 0 | 1 | 19 | 1.000 | 1.90 (0.31) | 0 | 1 | 19 | 1.000 |
Inferior vestibular nerve | 2.00 (0.00) | 2.00 (0.00) | 0 | 0 | 20 | 1.90 (0.31) | 0 | 2 | 18 | 1.000 | 2.00 (0.00) | 0 | 0 | 20 | 1.95 (0.22) | 0 | 1 | 19 | 1.000 | 1.95 (0.22) | 0 | 1 | 19 | 1.000 | ||
Cochlea | ||||||||||||||||||||||||||
Cochlear turn | 1.75 (0.44) | 1.70 (0.47) | 0 | 1 | 19 | 1.000 | 1.80 (0.41) | 1 | 0 | 19 | 1.000 | 1.90 (0.31) | 3 | 0 | 17 | 1.000 | 1.95 (0.22) | 4 | 0 | 16 | 0.625 | 2.00 (0.00) | 5 | 0 | 15 | 0.313 |
Modiolus | 2.00 (0.00) | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | 2.00 (0.00) | 0 | 0 | 20 | |||||
Spiral lamina | 1.60 (0.50) | 1.60 (0.50) | 0 | 0 | 20 | 1.55 (0.51) | 0 | 1 | 19 | 1.000 | 1.70 (0.47) | 2 | 0 | 18 | 1.000 | 1.70 (0.47) | 2 | 0 | 18 | 1.000 | 1.70 (0.47) | 2 | 0 | 18 | 1.000 | |
Vestibule | 1.00 (0.00) | 1.00 (0.00) | 0 | 0 | 20 | 1.05 (0.22) | 1 | 0 | 19 | 1.000 | 1.15 (0.37) | 3 | 0 | 17 | 1.000 | 1.20 (0.41) | 4 | 0 | 16 | 0.625 | 1.55 (0.51) | 11 | 0 | 9 | 0.005a | |
Semicircular canals | ||||||||||||||||||||||||||
Superior | 1.00 (0.79) | 0.95 (0.76) | 2 | 3 | 15 | 1.000 | 1.35 (0.49) | 8 | 1 | 11 | 0.195 | 1.60 (0.51) | 9 | 1 | 10 | 0.068 | 1.55 (0.51) | 9 | 2 | 9 | 0.161 | 1.70 (0.47) | 9 | 0 | 11 | 0.020a |
Posterior | 1.40 (0.75) | 1.45 (0.76) | 2 | 1 | 17 | 1.000 | 1.80 (0.41) | 9 | 1 | 10 | 0.107 | 1.75 (0.44) | 7 | 2 | 11 | 0.606 | 1.95 (0.22) | 9 | 0 | 11 | 0.020a | 1.90 (0.31) | 9 | 2 | 9 | 0.195 |
Horizontal | 1.15 (0.88) | 1.30 (0.66) | 5 | 2 | 13 | 1.000 | 1.60 (0.50) | 10 | 2 | 8 | 0.166 | 1.75 (0.44) | 9 | 0 | 11 | 0.020a | 2.00 (0.00) | 11 | 0 | 9 | 0.005a | 1.95 (0.22) | 11 | 1 | 8 | 0.017a |
Basic | Merge of basic and −50 Hz | |||||
---|---|---|---|---|---|---|
Mean grade (SD) | Mean grade (SD) | Compared to the basic images | ||||
Better | Worse | Equal | P | |||
Device B (n = 10) | ||||||
Sella turcica | 0.20 (0.63) | 2.00 (0.00) | 9 | 0 | 1 | 0.003a |
Right cavernous sinus | 0.80 (1.03) | 2.00 (0.00) | 6 | 0 | 4 | 0.020a |
Left cavernous sinus | 1.20 (1.03) | 2.00 (0.00) | 4 | 0 | 6 | 0.072 |