Table 1:

Descriptions for MSAD and CTDI variants

Dose IndexDescription
MSADAverage dose over 1 scan interval in the center region of multiple scans
CTDIIntegrated dose profile for a single section, normalized to the beam width; equivalent to MSAD and measured by using multiple TLDs or 1 ionization chamber
CTDI100Radiation dose index for 100 mm along the length of an entire pencil ionization chamber
CTDIwWeighted average of the CTDI100 measured at the periphery and at the center of phantoms
CTDIvolCTDIw divided by pitch
DLPCTDIvol multiplied by the length of the scan
  • Note:—TLD indicates thermoluminescent dosimeter; MSAD, multiple scan average dose.