Dose length product

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The dose-length product (DLP) is a unit of measurement in dosimetry and describes the radiation exposure from an X-ray with the help of a computer tomograph .

While the CTDI (Computed Tomography Dose Index) only quantifies the level of the radiation dose in an assumed individual slice of the computer tomograph, the dose-length product also includes the size of the irradiated volume. The value of the dose-length product is obtained by multiplying the CTDI by the length of the examination volume. The unit of the DLP is the mGy * cm (milli- gray * centimeter).

The index (w or air) indicates whether the DLP was determined in air or in water. The distinction is important because the two values ​​differ significantly from one another.

literature

  • Jürgen Freyschmidt, Theodor Schmidt: Manual of diagnostic radiology. Volume 1: Radiation Physics, Radiation Biology, Radiation Protection. Springer, Berlin 2003, ISBN 3-540-41419-3 , p. 29 ( limited preview in the Google book search).