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Table 2 CT imaging protocols

From: Development and external validation of a radiomics model for assessment of HER2 positivity in men and women presenting with gastric cancer

Parameters

Routine CT examinations

Dual-energy CT examinations

CT version

Phillips 256 iCT, Phillips Medical System, Netherlands; GE Discovery CT750 HD scanner or Revolution CT, GE Healthcare, USA

Spectral CT (GE Discovery CT750 HD scanner, GE Healthcare, USA)

CT tube voltage

120 kVp

Spectral imaging mode rapid switching between 80 and 140 kVp

CT tube current

120–550 mA

375 mA

CT rotation time

0.5 s

0.6 s

Contrast agent type

Omnipaque, GE Healthcare, USA

Omnipaque, GE Healthcare, USA

Contrast agent concentration

350 mgI/mL

350 mgI/mL

Contrast agent dosage

1.5 mL/kg body weight

1.5 mL/kg body weight

Contrast agent infused rate

3.0 mL/s

3.0 mL/s

Arterial phase interval time

30 s after injection of contrast agent

30 s after the injection of contrast agent

Venous phase interval time

70 s after injection of contrast agent

70 s after the injection of contrast agent

Field of view

500 × 500 mm

400 × 400 mm

Reconstruction/ image thickness

120 kVp; 0.625 mm or 1.25 mm or 5 mm

70 keV, 1.25 mm