Table 4 CT acquisition parameters across three centers

Parameter	Center 1 (Liaoning Cancer Hospital)	Center 2 (Shengjing Hospital of China Medical University)	Center 3 (Zhejiang Cancer Hospital)
CT Scanner	Toshiba	Philips	Philips Ingenuity
Tube Voltage	120 kV	120 kV	120 kV
Tube Current	Automatic mAs	Automatic mAs	Automatic mAs
Detector Collimation	0.5 × 64	0.625 × 64 or 0.625 × 128	0.625 × 128
Contrast Agent Concentration	320 mg I/mL	350 mg I/mL	350 mg I/mL
Contrast Agent Dose	60 mL	80 mL	80 mL
Injection Rate	3.0 mL/s	2.5 mL/s	3.0 mL/s
Venous Phase Scan Delay	45–60 s	70 s	65–70 s
Image Matrix	512 × 512	512 × 512	512 × 512
Reconstructed Slice Thickness	1–5 mm	3 mm	1–2 mm

Minor variations exist in scanner models, contrast injection protocols, and image reconstruction settings.
CT computed tomography, kV kilovoltage, mAs milliampere-seconds, mg I/mL milligrams of iodine per milliliter, mL milliliters, mL/s milliliters per second, s seconds, mm millimeters, Detector Collimation The number and thickness of detector rows used to acquire images, Image Matrix Pixel dimensions of reconstructed images.

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