A DICOM ﬁle presents data as a sequence of elements containing information about the image (graph etc.), where the last element has the image (graph etc.) itself. Each element comprises several parts, including:
Tag — a unique element identiﬁer comprised of a pair of values represented in the hexadecimal number system and determining the group number and the element number
Data type — a line showing the data type abbreviation (two symbols)
Data ﬁeld length;
Data — the information comprised in the element, including the image (graph etc.) itself
If the Data ﬁeld contains information that cannot be represented in the form of a text (e.g. an image or graph), then the respective column will read: Binary content. Hidden.
If the tag is standard, its name will be shown. If the tag is reserved by a certain modality manufacturer or there is an error in its name, then the ﬁeld will read: Unknown Tag & Data. To learn about the data contained in this tag, you will need to study the documents for the modality used in the study. The 7fe0,0010 (PixelData) tag contains an image, a graph or some other visual data.
Examples of elements:
|Unknown Tag & Data||0051,1009||LO||4||1.0|
|PixelData||7fe0,0010||OW||2||Binary content. Hidden.|