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CTA protocol
CTA Routine CTA Postclipping
Pre-CTA Routine head precontrast Routine head precontrast
Coverage C1–2 to 2 cm below the inner table of the vertex C1–2 to 2 cm below the inner table of the vertex
Acquisition Helical Helical
Detectors 16i (64i) 16i (64i)
Rotation time 0.6 seconds 0.6 seconds
Section thickness 0.625 mm 0.625 mm
Pitch 0.938:1 (0.969:1) 0.562:1 (0.531:1)
Table speed 9.38 cm/s (19.37 cm/s) 5.62 cm/s (10.62 cm/s)
Scanning FOV 25 cm (32 cm) 25 cm (32 cm)
kV(p) 120 120
mA 750 750
Display FOV 15 cm 15 cm
Algorithm Standard Standard
Contrast injection Dual injector: 50-mL Omnipaque 300,^* 4 mL/s; 40 mL saline, 2.5 mL/s Dual injector: 50 mL Omnipaque 300,^* 4 mL/s; 40 mL saline, 2.5 mL/s
Reconstruction Sagittal and coronal MPRs, 2.5 mm thick × 2.0-mm spacing Sagittal and coronal MPRs, 2.5 mm thick × 2.0-mm spacing
Note:—MPR indicates multiplanar reconstruction image; FOV, field of view.
* Omnipaque 300 (iohexol), GE Health, Piscataway, NJ.