Table 2.

Image quality criteria for chest CT

Criterion no.	Description:
1	Visually sharp reproduction of a nodular hypodense structure in a high density area such as an alveolus in consolidated lung parenchyma
2	Visually sharp reproduction of a nodular hypodense structure in a low density area such as normal lung parenchyma
3	Visually sharp reproduction of a nodular hyperdense structure in a low density area such as a vessel in aerated lung parenchyma
4	Visually sharp reproduction of an inter- or intralobular septum
5	Visually sharp reproduction of the bronchial wall
6	Visually sharp reproduction of the lung fissure
7	Visually sharp reproduction of a peripheral pulmonary artery branch
8	Visually sharp reproduction of fibrous strands
9	Visually sharp reproduction of the parietal and or visceral pleura