Diagnostic accuracy of dual-layer spectral computed tomography virtual monoenergetic imaging with multiplanar reformation for T-staging of colorectal cancer

Table 1 Dual-layer spectral computed tomography parameters

Scan parameters and contrast agent injection protocol	Details
Scan parameters
Range	Diaphragmatic dome to the inferior pubic symphysis
Tube voltage (kV)	120
Tube current	Automatic tube current modulation
Detector collimation (mm)	64 × 0.625
Gantry rotation speed (second)	0.4
Pitch	1.0
Contrast agent
Concentration (mg/mL)	350
Dose (mL/kg)	1.5
Rate (mL/s)	3.0
Monitoring
Monitoring method	Bolus tracking
Monitoring level	Abdominal aorta
Monitoring threshold (HU)	150
Scan phases	Arterial phase, venous phase (delayed by 40 seconds)

HU: Hounsfield units.