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Table 1 Dual-energy CT parameter acquisition and scanning scheme

From: A clinical study of inferior mesenteric artery typing in laparoscopic radical resections with left colonic artery preservation of rectal cancer

Group

Scanning scheme/parameters

Scanned area

Diaphragmatic apex to lower margin of the symphysis pubis

Body position

Supine position

Tube voltage

A ball tube 90 kV/B ball tube SN 150 kV

Tube current

A ball tube 144 mAs/ B ball tube 90 mAs

Linear fusion coefficient

0.5

Pitch

1.0

Rotate speed

0.5 s

Collimation

2×192×0.6 mm

Slice thickness

1 mm

Scanning interval

1 mm

Monitoring technique

Phase III enhancement (automatic tracking technology: when the aorta monitoring threshold reaches 100 HU, the scanning of the artery phase is triggered, the venous phase scanning is performed after 40 s, and the delayed phase scanning is performed 80 s after the completion of the venous phase scanning)

Contrast agent

Iopromide

Contrast injection concentration

370 mgI/ml

Contrast injection dose

1.5 ml/kg

Contrast injection rate

3.5 ml/s

Subsequent normal saline

20~30 ml