DICOM files contain one header and zero, one, or several image pages. Image header applies to all pages in the image. ImageGear.Net loads the same metadata tree for each page in the image, and attaches this tree to the corresponding page. ImageGear .NET does not put any tags to document level metadata for DICOM images.

DICOM Metadata Root Level

Name	Id	Type	Value Type	Value	Value Length	Read Only
Preamble	Preamble	Leaf	Byte[]		128	No
MetaInfoHeader	MetaInfoHeader	Tree
DataSet	DataSet	Tree

MetaInfoHeader Level

Name	Id	Type	Value Type	Value	Value Length	Read Only
<tag name>	<tag id>	Leaf

DataSet may contain subtrees, corresponding to DICOM tags that have "Sequence" (SQ) type. Sequences can non contain normal tags (leafs). Instead, each Sequence contains one or more "Items". Items can contain normal tags including Sequences. All items within one Sequence must have the same set of tags, but tag values can be different.

DataSet Level

Name	Id	Type	Value Type	Value	Value Length	Read Only
<tag name>	<tag id>	Leaf
...
<SQ tag name>	<SQ tag id>	Tree
...

Sequence Level

Name	Id	Type	Value Type	Value	Value Length	Read Only
Item	Item	Tree
...

Item Level

Name	Id	Type	Value Type	Value	Value Length	Read Only
<tag name>	<tag id>	Leaf
...
<SQ tag name>	<SQ tag id>	Tree
...

When ImageGear saves images, it overwrites the following tags:

Id	Location	Type
FileMetaInformationVersion	MetaInfoHeader	Leaf
TransferSyntaxUID	MetaInfoHeader	Leaf
SamplesPerPixel	DataSet	Leaf
PhotometricInterpretation	DataSet	Leaf
Rows	DataSet	Leaf
Columns	DataSet	Leaf
BitsAllocated	DataSet	Leaf
BitsStored	DataSet	Leaf
HighBit	DataSet	Leaf
PixelRepresentation	DataSet	Leaf
PlanarConfiguration	DataSet	Leaf
Red Palette Color Look Up Table Descriptor	DataSet	Leaf
Green Palette Color Look Up Table Descriptor	DataSet	Leaf
Blue Palette Color Look Up Table Descriptor	DataSet	Leaf
Red Palette Color Look Up Table Data	DataSet	Leaf
Green Palette Color Look Up Table Data	DataSet	Leaf
Blue Palette Color Look Up Table Data	DataSet	Leaf
PixelData	DataSet	Leaf