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Table 2: 
Technical parameters of investigated protocols (brain perfusion and head and neck angiography), measured eye lens dose (for left, right eye and mean), and effective dose for the anthropomorphic ATOM male phantom on Somatom Force
3D Imaging Protocol ParametersNeuroVPCT_Prolonged, DynMulti4DNeuroVPCT_Prolonged, Head Angio
Scan coverage (cm)11.424
Tube voltage (kV)7090
Scan duration (sec)60NA
Number of cycles @ 1.5 seconds cycle time30NA
CTDIvol (mGy)144.219,9
DLP (mGy × cm)2169.5550
Eye lens dose (mean) (mGy)119 and 125 (SD, 122)11.8 and 11.7 (SD, 11.8)
Estimated effective dose (mSv)2.171.35
  • Note:—CTDIvol indicates volume CT dose index; DLP, dose-length product; NA, not applicable.