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DAP in DICOM header

DAP value in DICOM headers is given in dGy*cm*cm. It can be found at DICOM Tag (0018,115E).


For more detail, see for instance this web page.






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DAP unit converter

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DAP to mSv converter - radiography

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Website overview

Radiation dose converters DAP unit converter DAP to mSv converter DLP unit converter DLP to mSv converter  (CT) Dose rate converter Dose unit converter Information on quantities and website Dose Area Product (DAP) Effective dose DAP in DICOM header Feedback form About dr Wizard Miscellaneous calculators Age calculator BMI calculator Background topics Image quality Learn more?
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Dose area product (DAP)

Dose Area Product (DAP), is a multiplication of the dose and the area exposed, often expressed in Gy.cm2.  Modern x-ray systems are fitted with a DAP meter, able to record accumulated DAP during an  examination. A schematic of the imaging chain with DAP meter is given below. How is DAP measured? An ionization chamber larger than the area of the x-ray beam is placed just beyond the xray collimators. The DAP ionization chamber must intercept the entire x-ray field for an accurate reading. The DAP-value is depending on x-ray technique factors (kVp, mA, filtration) and time of the procedure and the area of the x-ray field. For example, a 5 x 5 cm x-ray field with an entrance dose of 1 mGy will yield a 25 mGy.cm2 DAP value. If the field is increased to 10 x 10 cm, with the same entrance dose of 1 mGy the DAP increases to 100 mGy-cm2, which is 4 times the DAP for the 5 x 5 cm field. Why DAP? Dose-area product is relatively easy to measure. DAP has been shown to correlate well ...
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