Table 8:

LightSpeed VCTa

Scanogram (AP–Lat)Basal Scan (Optional)Contrast Scan
CoverageSternum to midheadMidneck to cover the bifurcationFrom aortic arch to midhead
Scan modeScanogramHelicalHelical
Start timeNABolus trackingb
Range500 (mm)8 cmVariable
CollimationNA0.625 × 640.625 × 64
Rotation timeNA0.5 second0.5 second
Slice thicknessNA1 mm1 mm
Slice intervalNA0.625 mm0.625 mm
FOVWide20 cm20 cm
FilterNASharp (B)Sharp (B)
CTDI (mGy)1516
DLP (mGy × cm)0.60.6
Amount of CM40–50 mLe
IDR1.4–1.5 g I/s
Concentrationf370 mg I/mL
Flow ratef4 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.