HRCT Patterns



Under normal circumstances the pulmonary parenchyma on HRCT has a density ranging from −700 (750) to −920 (950) Hounsfield Units (HU). A decrease in HRCT density on below −920, or −950 HU, is considered pathological. It is caused by pathologies leading to a decrease of density or by cystic formations. They arise from traction, pathological widening of bronchial walls, focal hyperinflation, or by increased endoluminal bronchial pressure. Pulmonary emphysema is divided into centrilobular, panlobular or paraseptal, according to the location of the pathology in relation to the anatomy of the secondary pulmonary lobule. Centrilobular pulmonary emphysema is most commonly associated with chronic obstructive pulmonary disease (COPD) (Fig. 5.1).


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Authors and Affiliations

  1. 1.Department of RadiologyCharles University, Faculty of Medicine in Hradec Králové, University Hospital Hradec KrálovéHradec KrálovéCzech Republic
  2. 2.Department of RadiologyUniversity Hospital and Faculty of Medicine and Dentistry, Palacky UniversityOlomoucCzech Republic
  3. 3.Department of RadiologyFirst Medical Faculty of Charles University and Thomayer HospitalPragueCzech Republic

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