The Philips Gemini TF PET/CT scanner (Philips Medical Systems, Best, The Netherlands) was applied to conduct the 18F-FDG PET/CT imaging. The radiolabel was 18F-FDG (Atom High-tech Isotope Pharmaceutical Co., Ltd., Guangzhou, China; radiochemical purity > 95%). Patients were fasted for more than 4 h before examination. Fasting blood glucose was measured before intravenous injection of 18F-FDG (4.07–5.18 MBq/kg). Patients were allowed to rest for 60 min in a quiet, warm, dark condition before PET/CT examination.
The CT machine was fitted with a tube voltage of 80 kV, a tube current of 150 mAs, a screw pitch of 0.8, a rotation time of 0.5 s, and a layer thickness of 2 mm. PET acquisition was performed in three-dimensional mode; the scope of acquisition was from the upper thigh to the cranial roof, and the scanning time was 70 s/bed. The EBW system (Philips, Netherlands) was used for image reading.
HRCT acquisition was conducted while the patient was holding breath, and the scope of the scan was the lung lesion only. The acquisition parameters were as follows: (1) 120 kV, (2) 250 mAs, (3) pitch 0.8, and (4) slice thickness 1.0 mm. The lung window width and window level were 1,200 (Hounsfield unit) HU and − 600 HU, and the mediastinal window width and level were 350 HU and 40 HU, respectively.
The CT machine was fitted with a tube voltage of 80 kV, a tube current of 150 mAs, a screw pitch of 0.8, a rotation time of 0.5 s, and a layer thickness of 2 mm. PET acquisition was performed in three-dimensional mode; the scope of acquisition was from the upper thigh to the cranial roof, and the scanning time was 70 s/bed. The EBW system (Philips, Netherlands) was used for image reading.
HRCT acquisition was conducted while the patient was holding breath, and the scope of the scan was the lung lesion only. The acquisition parameters were as follows: (1) 120 kV, (2) 250 mAs, (3) pitch 0.8, and (4) slice thickness 1.0 mm. The lung window width and window level were 1,200 (Hounsfield unit) HU and − 600 HU, and the mediastinal window width and level were 350 HU and 40 HU, respectively.