APPENDIX IV: CT PROTOCOLS

   Philips iCT  GE Lightspeed VCT  GE Discovery VCT  Siemens DS Definition
MA 60 50 70 eff MAS 30-50MA
KV 100 100 100 100
Pitch 0.993 1.375: 1/55mm/rotation 1.375: 1/55mm/rotation 0.9
Collimation 128 x 0.625 mm 64 x 0.625mm 64 x 0.625mm 24 x 1.2mm
Reconstruction 1.25 x 0.625 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal 1.25 x 0.625 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal 1.25 x 0.625 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal 1.5 x 0.75 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal
Rotation Time 0.5s 0.6s 0.6s 0.5s
CTDi ~1.22 ~1.48 ~1.56 ~1.19
Software iDOSE (iterative recon) ACIR (iterative recon) standard processing IRIS (iterative recon)