Table 1 CTDI100 of different slice thicknesses measured by the 10-cm ionization chamber and the nMAG gel dosimeter at 120 kVp.
From: Dose and slice thickness evaluation with nMAG gel dosimeters in computed tomography
CTDI (mGy) | 2 mm | 5 mm | 10 mm | 14.4 mm | 38.4 mm |
|---|---|---|---|---|---|
CTDI100,c | |||||
Ionization chamber | 35.80 | 33.13 | 33.62 | 42.95 | 39.86 |
nMAG gel | 33.92 | 31.53 | 32.20 | 44.47 | 41.97 |
Difference | −5.25% | −4.83% | −4.22% | 3.54% | 5.29% |
CTDI100,p | |||||
Ionization chamber | 37.00 | 34.39 | 34.70 | 44.96 | 43.33 |
nMAG gel | 37.47 | 34.79 | 35.33 | 44.58 | 42.81 |
Difference | 1.27% | 1.16% | 1.82% | −0.85% | −1.20% |
CTDI100,w | |||||
Ionization chamber | 36.60 | 33.97 | 34.34 | 44.29 | 42.18 |
nMAG gel | 36.29 | 33.70 | 34.29 | 44.54 | 42.53 |
Difference | −0.85% | −0.79% | −0.15% | 0.56% | 0.83% |
