Article Figures & Data
Figures
- Fig 1.
Axial images of a 34-year-old woman with normal findings at the level of the posterior fossa (A) and basal ganglia (B). The patient belongs to the LD group (DLP, 832 mGy×cm). Note that the WM and GM differentiation is decreased. This is 1 of the 2 examinations that are considered diagnostically acceptable only under limited conditions (score of 3 for diagnostic acceptability criterion).
- Fig 2.
Axial images of a 45-year-old woman (A and C) from the STD group (DLP, 1100 mGy×cm) and a 37-year-old man (B and D) from the LD group (DLP, 713 mGy×cm) are compared. Both examinations have good WM and GM differentiation and are considered fully acceptable (score of 1 for diagnostic acceptability criterion). A and B, Posterior fossa. C and D, Basal ganglia.
Tables
Mean Parameter STD Group LD Group P CTDIvol posterior fossa (mGy) 93.49 ± 2.26 69.14 ± 1.48 <.001 CTDIvol cerebrum (mGy) 59.40 ± 1.44 38.55 ± 0.83 <.001 No. of images 39.5 ± 2.5 39.8 ± 2.7 .470 DLP (mGy×cm) 1081.28 ± 66.57 748.61 ± 51.78 <.001 Effective dose (mSv) 2.3 ± 0.1 1.6 ± 0.1 <.001 Mean Measure STD Group LD Group P Measured noise in the air (HU) 3.40 ± 0.50 3.32 ± 0.43 .273 Measured noise in the WM (HU) 3.60 ± 0.33 4.07 ± 0.52 <.001 Measured noise in the CSF (HU) 3.46 ± 0.48 2.92 ± 0.46 <.001 CNR 2.29 ± 0.61 2.40 ± 0.74 .349 SNR 6.77 ± 0.86 5.52 ± 0.80 <.001 Subjective image noise 1.53 ± 0.50 1.86 ± 0.40 <.001 Sharpness 1.43 ± 0.45 1.63 ± 0.57 .04 Diagnostic acceptability 1.16 ± 0.41 1.24 ± 0.42 .062 Artifacts 2.09 ± 0.30 2.02 ± 0.31 .148 Mean of Criteria Reader 1 Reader 2 STD Group LD Group STD Group LD Group Subjective image noise 1.53 ± 0.58 1.92 ± 0.42 1.53 ± 0.58 1.81 ± 0.47 Sharpness 1.45 ± 0.50 1.65 ± 0.56 1.41 ± 0.50 1.57 ± 0.56 Diagnostic acceptability 1.16 ± 0.42 1.28 ± 0.51 1.16 ± 0.42 1.21 ± 0.44 Artifacts 2.06 ± 0.31 2.02 ± 0.38 2.12 ± 0.33 2.01 ± 0.30
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