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Table 1 CT calibration data

From: Detection of emphysema progression in alpha 1-antitrypsin deficiency using CT densitometry; Methodological advances

 

Baseline

Follow-up

Change from baseline

Internal air calibration (n = 68)

-998.7 ± 0.9

-997.5 ± 1.9

1.2 ± 5.5

LN300 electron density rod (n = 32)

-717.5 ± 2.4

-716.4 ± 3.2

1.1 ± 3.0

LN450 electron density rod (n = 32)

-552.4 ± 2.6

-551.6 ± 2.8

0.8 ± 3.4

'Solid' water electron density rod (n = 32)

-7.8 ± 3.5

-9.7 ± 3.6

1.9 ± 2.7

  1. All values are presented as the mean ± standard deviation in Hounsfield Units (HU).