Implement Clean Structured Content Option of DICOM SR

[nicolasvandooren]

http://dicom.nema.org/medical/dicom/current/output/chtml/part15/sect_E.3.4.html

[mhenx]

On 3 attributes, information should be treated differently as in the Basic Profile
"Instances of Structured Report SOP Classes may contain identifiable information in a Content Sequence (0040,A730) encoded in Content Items. Instances of other SOP Classes may contain structured content encoded in a similar manner in the Acquisition Context Sequence (0040,0555) or Specimen Preparation Sequence (0040,0610)."

In the confidentiality_profile_attributes.json file used in Karnak to implement the Basic Profile contains options to be applied to these fields. The action applied to those fields should be cleanStructContOpt instead of the basicProfile
{
"name":"Acquisition Context Sequence",
"tag":"(0040,0555)",
"stdCompIOD":"Y",
"basicProfile":"X/Z",
"cleanStructContOpt":"C",
"id":"00400555"
}
{
"name":"Content Sequence",
"tag":"(0040,A730)",
"stdCompIOD":"Y",
"basicProfile":"D",
"cleanStructContOpt":"C",
"id":"0040a730"
}
{
"name":"Specimen Preparation Sequence",
"tag":"(0040,0610)",
"stdCompIOD":"Y",
"basicProfile":"Z",
"cleanStructContOpt":"C",
"id":"00400610"
}

The C action is defined as follows : clean, that is replace with values of similar meaning known not to contain identifying information and consistent with the VR
The Basic Profile removes more information than the cleanStructContOpt actions, that may be more suited to those kind of instances to preserve information. There are no information leakage when applying the basic profile instead of the specific SR options.
Other variants are defined in the Basic Application Level Confidentiality Options in the Standard (copy pasted from https://dicom.nema.org/medical/dicom/current/output/chtml/part15/sect_E.3.html#sect_E.3.1)

Various Options are defined to be applicable to the Basic Application Level Confidentiality Profile. Some of these Options require removal of additional information, and some of these Options require retention of information that would otherwise be removed.

The following Options are defined that require removal of additional information:

• Clean Pixel Data Option
• Clean Recognizable Visual Features Option
• Clean Graphics Option

The following options are defined that require processing of information that would otherwise be removed but that is needed for specific uses:

• Clean Structured Content Option
• Clean Descriptors Option

The following Options are defined that require retention of information that would otherwise be removed but that is needed for specific uses:

• Retain Longitudinal Temporal Information with Full Dates Option
• Retain Longitudinal Temporal Information with Modified Dates Option
• Retain Patient Characteristics Option
• Retain Device Identity Option
• Retain Institution Identity Option
• Retain UIDs Option
• Retain Safe Private Option