Add length of encapsulated document when not even Status Assigned Date of Last Update 2018/09/13 Person Assigned David Clunie Submitter Name David Clunie Submission Date 2018/09/01 Correction Number CP-1851 Log Summary: Add length of encapsulated document when not even Name of Standard PS3.3, PS3.6 Rationale for Correction: The encapsulated document payload of an encapsulated PDF, CDA or STL is required to be encoded as even length, i.e., padded if the original document was of odd length. However, there is no means of recovering the actual odd length of the encapsulated document when extracting it and hence obtaining a lossless copy of the original. Indeed, the presence of trailing padding may disrupt the parsing of the extracted document. Add a new Attribute containing the actual length, which may be equal to or one less than the VL. Correction Wording:

Encapsulated Document Module Attributes

Attribute Name	Tag	Type	Attribute Description
...			A
MIME Type of Encapsulated Document	(0042,0012)	1	The type of the encapsulated document stream described using the MIME Media Type (see RFC 2046).
List of MIME Types	(0042,0014)	1C	MIME Types of subcomponents of the encapsulated document. Required if the encapsulated document incorporates subcomponents with MIME types different than the primary MIME Type of the encapsulated document. An Encapsulated CDA that includes an embedded JPEG image and an embedded PDF would list "image/jpeg\application/pdf".
Encapsulated Document	(0042,0011)	1	Encapsulated Document stream, containing a document encoded according to the MIME Type.
Encapsulated Document Length	(0042,eee1)	3	The length of the Encapsulated Document stream, not including any trailing padding added for encapsulation as a DICOM object. If present, shall be equal to the Value Length if even, or one less than the Value Length if odd. In the absence of this Attribute, the value of Encapsulated Document (0042,0011) may have been padded to even length as required for all DICOM Data Element Values, so it would not be possible to extract the original unpadded document if it were of odd length.

Amend DICOM PS3.6 as follows (changes to existing text are bold and underlined for additions and struckthrough for removals):

Registry of DICOM Data Elements

Tag	Name	Keyword	VR	VM
(0042,eee1)	Encapsulated Document Length	Encapsulated​Document​Length	UL	1