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Table 8: LightSpeed VCT^{^a}
Scanogram (AP–Lat) Basal Scan (Optional) Contrast Scan
Coverage Sternum to midhead Midneck to cover the bifurcation From aortic arch to midhead
Scan mode Scanogram Helical Helical
Start time NA Bolus tracking^{^b}
Range 500 (mm) 8 cm Variable
Collimation NA 0.625 × 64 0.625 × 64
Pitch NA 0.984 0.984
kV 120 120 120
mA 50–200^{^c} 350 350
Rotation time NA 0.5 second 0.5 second
Direction NA Craniocaudal^{^d} Craniocaudal^{^d}
Slice thickness NA 1 mm 1 mm
Slice interval NA 0.625 mm 0.625 mm
FOV Wide 20 cm 20 cm
Filter NA Sharp (B) Sharp (B)
CTDI (mGy) – 15 16
DLP (mGy × cm) – 0.6 0.6
Amount of CM – – 40–50 mL^{^e}
IDR – – 1.4–1.5 g I/s
Concentration^{^f} – – 370 mg I/mL
Flow rate^{^f} – – 4 mL/s
↵a GE Healthcare.
↵b Position of bolus tracking: aortic arch, threshold 100 HU.
↵c 50 mA in AP and 200 in Lat.
↵d Caudocranial is also possible with optimal results.
↵e Variable according to the concentration.
↵f Concentration × flow rate = IDR. The parameter to be considered is IDR.