Imaging
We used three different scanners: two single-slice scanners, Siemens Somatom Balance (Siemens Medical, Erlangen, Germany) in Helsinki, Siemens Somatom Plus 4 (Siemens Medical) in Tampere, and one multislice scanner, GE Lightspeed 16 Advantage (GE Healthcare, Milwaukee, WI, USA) in Turku. HRCT images were obtained during a full inspiration in a prone position. The slice thickness was 1–1.25mm. The slices were taken at 3-cm intervals from the lung apex to the costophrenic angle. The imaging parameters were 130–140kV and 100–111mA. The images were printed as hard copies at window settings appropriate for viewing the lung parenchyma. In Tampere and Turku the window width was 1500Hounsfield Unit (HU) and window level −600HU. In Helsinki the interpreters used two settings in the same session: 1200/−700, and 2000/−400HU. The difference between centres was due to the fact that the observer groups were used to these different settings in their clinical practice.
Imaging
We used three different scanners: two single-slice scanners, Siemens Somatom Balance (Siemens Medical, Erlangen, Germany) in Helsinki, Siemens Somatom Plus 4 (Siemens Medical) in Tampere, and one multislice scanner, GE Lightspeed 16 Advantage (GE Healthcare, Milwaukee, WI, USA) in Turku. HRCT images were obtained during a full inspiration in a prone position. The slice thickness was 1–1.25mm. The slices were taken at 3-cm intervals from the lung apex to the costophrenic angle. The imaging parameters were 130–140kV and 100–111mA. The images were printed as hard copies at window settings appropriate for viewing the lung parenchyma. In Tampere and Turku the window width was 1500Hounsfield Unit (HU) and window level −600HU. In Helsinki the interpreters used two settings in the same session: 1200/−700, and 2000/−400HU. The difference between centres was due to the fact that the observer groups were used to these different settings in their clinical practice.
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