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Table 4 Dose and noise evaluationa

From: Low-dose CT for quantitative analysis in acute respiratory distress syndrome

Measurement

140 mAs

60 mAs

15 mAs

7.5 mAs

P-value

CTDIvol (mGy)

22.1 ± 0.0

9.2 ± 0.8

2.2 ± 0.3

1.1 ± 0.1

<0.001

DLP (mGy/cm)

870.5 ± 47.7

362.2 ± 45.2

96.5 ± 39.0

44.9 ± 6.4

<0.001

E (mSv)

17.8 ± 1.0

7.4 ± 0.9

2.0 ± 0.8

0.9 ± 0.1

<0.001

Image noise (HU)

10.0 ± 1.1

15.9 ± 3.5

37.5 ± 10.6

73.8 ± 17.5

<0.001

  1. aCTDIvol = volume computed tomography dose index; DLP = dose-length product; E = effective dose; HU = Hounsfield unit; Image noise = image noise of each applied mAs calculated as the mean SD of tissue density (expressed in HUs) of ten regions of interest placed on a uniform tissue (aorta) in ten different scans; mAs: tube current-exposure time product; mSv = millisievert; P = P-value of one-way analysis of variance. Data are expressed as mean ± SD.