Keywords:
Digital radiography, CT-High Resolution, Conventional radiography, Lung
Authors:
S. Yun, J. W. Kim, S. S. Kim, J. E. Lee; Daejeon/KR
DOI:
10.1594/ecr2011/C-0724
Methods and Materials
1.
Subjects
- From September 2009 to January 2010
- Of 3511 patients who had microbiologically confirmed influenza A (H1N1) infection,
60 patients (1.7%) underwent chest radiographs and chest CT.
Among the 60 patients,
we excluded 14 patients who had underlying pulmonary disease.
- 27 men and 19 women,
mean age of 39 years (range,
17 to 81 years)
- Positive H1N1 virus infection was confirmed by a real-time reverse transcriptase polymerase chain reaction
2.
Imaging Techniques
1) Chest radiographs
- Digital Diagnost system (Philips Medical System)
- Posteroanterior/lateral-projection radiographs
- 100kV,
4/18 mAs,
and 180-cm film–focus distance
2) Chest CT scans
- 64-MDCT scanner (Somatom Sensation,
Siemens Medical System)
- End-inspiratory acquisition,
120 kV,
70-186 mAs,
and 1-mm reformation
- The images were viewed on both lung (window width,
1,500 HU; level,
–700 HU) and mediastinal (window width,
350 HU; level,
20 HU) settings.
- All patients received IV contrast medium.
3.
Imaging Evaluation
1) Initial chest radiographs
- They are evaluated whether it is normal or abnormal.
2) Chest CT scans
- bronchial wall thickening
- nodular opacities
- ground-glass opcities
- consolidation
- diffuse, multifocal,
focal
- Presence of pleural effusion or lymphadenopathy
3) Dividing into three groups on the basis of the patterns
- Group1 - bronchial wall thickening
- Group2 - consolidation or ground-glass opacity
- Gruop3 - bronchial wall thickening and consolidation/ground-glass opacity