Ge lightspeed vct 64

The CT scan was performed using a 64-detector CT scanner (GE Lightspeed VCT 64, Philips Medical Systems, Amsterdam, the Netherlands) or a 128-detector CT scanner (Brilliance ICT, Philips Medical Systems). A tube voltage of 80–120 kV was applied with the tube current being automatically regulated. A collimation of 0.6 mm was used, and images with a slice thickness of 5 mm with a gap of 1 mm were reconstructed using a standard reconstruction algorithm. Digital Imaging and Communications in Medicine (DICOME) images were downloaded from the picture archiving and communication system (PACS). Data were randomly divided into training and validation cohorts at a ratio of 3.3:6.7, and 74 random seeds were used.

All patients had an un-enhanced chest CT scan before treatment. The CT scan was performed using a 64-detector CT scanner (GE Lightspeed VCT 64, Philips Medical Systems, Amsterdam, the Netherlands) or a 128-detector CT scanner (Brilliance ICT, Philips Medical Systems). The CT acquisition parameters were as follows: tube voltage of 100 Kv, the tube current being automatically regulated, pitch of 0.984:1, slice thickness of 5.0 mm, and slice interval of 5.0 mm. The scans ranged from the apex to the bottom of the lung.