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Table 1: Parameters of different scan protocols
Standards CT CT Angiography CT Perfusion
Base Cerebrum Intracranial Cervical Protocol I Protocol II Protocol III
Collimation (mm) 20 × 1.2 20 × 1.2 64 × 0.6 64 × 0.6 20 × 1.2 20 × 1.2 20 × 1.2
Table feed (mm) 24 24 45,9 69,7 0 0 0
Pitch 1 1 1.2 1.8 0 0 0
Tube current (mAs_eff) 350 300 160 115 270 200 200
Electrical mA 350 300 383 417 270 200 200
Potential (kV) 120 120 100 120 80 80 120
Rot. time (s) 1 1 0.5 0.33 1 1 1
Scan length (mm) 48 95 250 280 24 24 24
Scan time (s) 6.25 4.58 40 40 40
CTDI_vol total (mGy) 39.86 34.16 12.79 7.9 432 320 970
DLP total (mGy x cm) 203 348 386 277 1037 768 2330
Note:—Table feed indicates table movement per second. Pitch corresponds to the dose-relevant pitch (table feed per total collimation considering the number of detector rows acquired simultaneously). CTDI indicates computed tomography dose index; DLP, dose–length product.