How to save DICOM images from PACS

[@uzairhoosen2265]

Hi,
On the Dicom tag : (0018, 115E ) it stores the DAP value eg 1.149 with no units. It is known that DAP is expressed in Gy.cm2 but under dicom standards its given as dGy.cm2. I know they just differ by prefix and contextually they the same. How would I know what units my DAP value actually is ? My X ray was captured with a Siemens machine, and the image was complemented with a Dicom info. Since it follows Dicom standards can I assume it'll use dGy.cm2 as its units or could there be an exception to this ? Basically I'm asking if a system is following dicom protocols then they must have the the same units stipulated by Dicom standards or can they differ i.e instead of dGy.cm2, they present the value stored in this tag in Gy.cm2 ? Note: this is not a private tag.
Thanks

[@xrayreview-drb]

Hello Doc. If I am understanding you correctly, the images are being saved in dicom format however there are no measurement units associated with the DAP value?

[@uzairhoosen2265]

@xrayreview-drb yeah, that's correct

[@xrayreview-drb]

I have seen this a few times in association with lower-quality units such as veterinarian x-ray machines. I'm unaware of any way to fix this :/