Dose length product

Dr Craig Hacking and Dr Matt A. Morgan et al.

Dose length product (DLP) is a measure of CT tube radiation output. It is related to CTDIvol, but CTDIvol represents the dose through a slice of an appropriate phantom. DLP accounts for the length of radiation output along the z axis (the long axis of the patient).

DLP = (CTDIvol ) * (length of scan, cm)

[units: mGy*cm]

It is important to remember that DLP is not the patient's effective dose. The effective dose depends on other factors including patient size and the region of the body being scanned.

Some factors have been estimated to convert DLPs into effective doses, depending on the body region. If interested, consult reference 3.

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Article information

rID: 57651
Section: Physics
Synonyms or Alternate Spellings:
  • DLP
  • DLPs
  • Dose length products

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