Anatomy of a DICOM file | DICOM 1

Structure of a DICOM file: using DCM4CHE to read the tags & extract the pixel data from a DICOM file.

Code of the entire project (2020 version, may slightly differ from the videos) is available from:

This project is a part of the INFO-H-400 - Medical Information Systems course @ Université Libre de Bruxelles.

[uzairhoosen]

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

[RitikaChhabra]

Can we get an idea which tag should be used for which file or which tags are mandatory?