Table 2 CTDI100 of different slice thicknesses measured by the 10-cm ionization chamber and the nMAG gel dosimeter at 140 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 | 50.42 | 46.30 | 46.86 | 60.01 | 55.00 |
nMAG gel | 47.86 | 44.84 | 45.45 | 60.74 | 57.47 |
Difference | −5.08% | −3.15% | −3.01% | 1.22% | 4.49% |
CTDI100,p | |||||
Ionization chamber | 51.57 | 47.57 | 47.54 | 62.53 | 58.73 |
nMAG gel | 52.21 | 48.43 | 48.06 | 62.35 | 58.11 |
Difference | 1.24% | 1.81% | 1.09% | −0.29% | −1.06% |
CTDI100,w | |||||
Ionization chamber | 51.18 | 47.14 | 47.31 | 61.69 | 57.49 |
nMAG gel | 50.76 | 46.57 | 47.19 | 61.81 | 57.90 |
Difference | −0.82% | −1.21% | −0.25% | 0.19% | 0.71% |
