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Table 4 Comparison of quantitative image analysis data of the ASIR and non-ASIR groups

From: Value of using adaptive statistical iterative reconstruction-V (ASIR-V) technology in pediatric head CT dose reduction

Tube current (mA)/reconstruction SNR CNR
Non-ASIR Non-ASIR
148 mA/non-ASIR 7.44 ± 0.81 1.89 ± 0.35
Tube current (mA)/ASIR reconstruction SNR SNR CNR CNR
ASIR 60% ASIR 80% ASIR 60% ASIR 80%
ASIR (n = 27) 6.43 ± 1.01 7.37 ± 0.75 1.54 ± 0.37 1.63 ± 0.27
Test of significance with non-ASIR group t = 2.37, p = 0.07 t = 0.176, p = 0.96 t = 2.11, p = 0.9 t = 2.43, p = 0.687
40 mA/ASIR (n = 7) 4.9 ± 1.13 5.67 ± 1.11 1.28 ± 0.28 1.48 ± 0.31
Test of significance with non-ASIR group t = 5.94, p = 0.001* t = 4.18, p = 0.005* t = 3.99, p = 0.0008* t = 2.62, p = 0.016*
60 mA/ASIR (n = 8) 6.37 ± 0.78 7.39 ± 0.53 1.56 ± 0.47 1.85 ± 0.28
Test of significance with non-ASIR group t = 3.02, p = 0.06 t = 0.155, p = 0.877 t = 1.88, p = 0.075 t = 0.276, p = 0.786
80 mA/ASIR (n = 7) 6.79 ± 1.24 7.56 ± 0.74 1.42 ± 0.46 1.64 ± 0.08
Test of significance with non-ASIR group t = 1.45, p = 0.163 t = 0.329, p = 0.746 t = 2.62, p = 0.017* t = 2.17, p = 0.08
100 mA/ASIR (n = 5) 7.66 ± 0.88 8.88 ± 0.517 1.88 ± 0.24 2.17 ± 0.36
Test of significance with non-ASIR group: t = 0.51, p = 0.616 t = 3.67, p = 0.0019* t = 0.06, p = 0.95 t = 1.53, p = 0.146
  1. *Statistically significant if p < 0.05
  2. All parameters are described as mean ± standard deviation
  3. ASIR adaptive statistical iterative reconstruction, mA milliampere, SNR signal-to-noise ratio, CNR contrast-to-noise ratio