Table 1.

HRCT technical parameters for the assessment of airways (* kVp: Peak kilovoltage; **mAs: Milliampere seconds; ^# HU: Hounsfield unit)

Parameter	Value
Volumetric acquisition	-
Tube potential	120–80 kVp*; 100 or 80 kVp* to be preferred for small size patients
Tube current	≤240 milliampere (mA);≤100 mAs** or effective mAs**
Slice thickness	≤1.5 millimetres (mm)
Gantry rotation time	As short as possible (e.g. 200–500 ms), always ≤1 sec
Pitch	1–1.5
Reconstruction algorithm	High spatial frequency
Lung parenchyma windows mean/width	−400 to −700 HU#/>1000 HU #
Soft tissue windows mean/width	50/350 HU