Admin Changing the Pseudonymisation Script

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If you edit the pseudonymisation script you do this at your own risk, and you are responsible for checking that the results of using the new script are sufficiently anonymised for your needs. It is strongly advised that you do not edit the pseudonymisation scripts without first discussing with your Information Governance and IT departments.

DASHER uses a two-stage pseudonymisation process. The first stage is customisable, using a DicomEdit script and the file is located in [shared storage]/scripts1/anon.das. A guide to the DicomEdit scripting language:

https://wiki.xnat.org/display/XTOOLS/DicomEdit+4.2+Language+Reference

There are some required fields, which are in the example anon.das files:

• (0008,103E) := "unknown" // Series Description
• (0008,0090) := "ct id" // Referring Physician's Name
• (0010,0020) := "ct session id" // Patient ID
• (0010,0010) := "ct subject id" // Patient's Name
• (0012,0063) := "Secure DICOM Uploader deidentification v001" // Deidentification Code

No UID fields should be deleted or re-generated. This is done during the next stage. In Addition, structure set fields need to be kept. Therefore:

// (0008,0014)       // Instance Creator UID
// (0008,0018)       // SOP Instance UID
// (0008,1150)       // RT TSructure Set Storage
// (0008,1155)       // Referenced SOP Instance UID
// (0020,0010)
// (0002,0003)       // Media Storage SOP Instance UID
// (0020,000D)       // Study Instance UID
// (0020,000E)       // Series Instance UID
// (0020,0052)       // Frame of Reference UID
// (0020,0200)       // Synchronization FofR UID
// (0020,9161)       // Concatenation UID
// (0088,0140)       // Storage Media File-Set UID
// STRUCTURE SETs - (3006,XXXX) - DO NOT DELETE ANY OF THESE

The default DicomEdit anonymisation script is:

// Anonymisaton Script v1, Secure DICOM Uploader
// Daniel Beasley October 2019


// All UIDs are subsequently rewritten  - do nto delete or generate new UIDs

// (0008,0014)       // Instance Creator UID
// (0008,0018)       // SOP Instance UID
// (0008,1150)       // RT TSructure Set Storage
// (0008,1155)       // Referenced SOP Instance UID
// (0020,0010)
// (0002,0003)       // Media Storage SOP Instance UID
// (0020,000D)       // Study Instance UID
// (0020,000E)       // Series Instance UID
// (0020,0052)       // Frame of Reference UID
// (0020,0200)       // Synchronization FofR UID
// (0020,9161)       // Concatenation UID
// (0088,0140)       // Storage Media File-Set UID
// STRUCTURE SETs - (3006,XXXX) - DO NOT DELETE ANY OF THESE



(0008,0012) := "19000101"       // instance creation date
(0008,0013) := "120000"         // instance creation time
(0008,0020) := "19000101"       // Study Date
(0008,0021) := "19000101"       // Series Date
(0008,0023) := "19000101"       // Content date
(0008,0030) := "120000"         // Study time
(0008,0031) := "120000"         // Series time
(0008,0033) := "120000"         // Content Time


- (0008,0050)       // Accession Number
- (0008,0080)       // Institution Name         
- (0008,0081)
(0008,0090) := "clinical trial id"       // Referring Physician's Name
- (0008,0092)
- (0008,0094)
- (0008,0096)       // Referring Physician Identification SQ
- (0008,1010)
- (0008,1030)      // Study Description
(0008,103E) := "unknown"       // SERIES DSECRITPTION

- (0008,1040)
- (0008,1048)
- (0008,1050)
- (0008,1060)
- (0008,1070)
- (0008,1080)
- (0008,1111)       // Referenced Performed Procedure Step SQ
- (0008,1120)       // Referenced Patient SQ
- (0008,1032)       // Procedure Code SQ
- (0008,1140)       // Referenced Image SQ
- (0008,1048)       // Physician(s) of Record
- (0008,1049)       // Physician(s) of Record Identification SQ
- (0008,1050)       // Performing Physicians' Name
- (0008,1052)       // Performing Physician Identification SQ
- (0008,1060)       // Name of Physician(s) Reading Study
- (0008,1062)       // Physician(s) Reading Study Identification SQ
- (0008,1110)       // Referenced Study SQ
- (0008,1111)       // Referenced Performed Procedure Step SQ
- (0008,1250)       // Related Series SQ
- (0008,2111)
- (0008,9092)       // Referenced Image Evidence SQ
(0010,0010) := "ct subject id"       // Patient's Name
(0010,0020) := "ct session id"       // Patient ID
- (0010,0021)       // Issuer of Patient ID
- (0010,0030)       // Patient's Birth Date
- (0010,0032)       // Patient's Birth Time
- (0010,0040)
- (0010,0050)       // Patient's Insurance Plan Code SQ
- (0010,0101)       // Patient's Primary Language Code SQ
- (0010,1000)       // Other Patient IDs
- (0010,1001)       // Other Patient Names
- (0010,1002)       // Other Patient IDs SQ
- (0010,1005)       // Patient's Birth Name
- (0010,1010)       // Patient's Age
- (0010,1020)
- (0010,1030)
- (0010,1040)       // Patient's Address
- (0010,1060)       // Patient's Mother's Birth Name
- (0010,1080)       // Military Rank
- (0010,1081)       // Branch of Service
- (0010,1090)       // Medical Record Locator
- (0010,2000)       // Medical Alerts
- (0010,2110)       // Allergies
- (0010,2150)       // Country of Residence
- (0010,2152)       // Region of Residence
- (0010,2154)       // Patient's Telephone Numbers
- (0010,2160)       // Ethnic Group
- (0010,2180)       // Occupation
- (0010,21A0)       // Smoking Status
- (0010,21B0)       // Additional Patient History
- (0010,21C0)       // Pregnancy Status
- (0010,21D0)       // Last Menstrual Date
- (0010,21F0)       // Patient's Religious Preference
- (0010,2203)       // Patient's Sex Neutered
- (0010,2297)       // Responsible Person
- (0010,2298)       // Responsible Person Role
- (0010,2299)       // Responsible Organization
- (0010,4000)
(0012,0063) := "Secure DICOM Uploader deidentification v001"     // IMPORTANT! DO NOT CHANGE!
- (0018,1000)
- (0018,1030)

- (0020,4000)
- (0020,9221)       // Dimension Organization SQ
- (0020,9222)       // Dimension Index SQ
- (0038,0010)       // Admission ID
- (0038,0011)       // Issuer of Admission ID
- (0038,0060)       // Service Episode ID
- (0038,0061)       // Issuer of Service Episode ID
- (0038,0062)       // Service Episode Description
- (0038,0500)       // Patient State
- (0038,0100)       // Pertinent Documents SQ
- (0040,0260)       // Performed Protocol Code SQ
- (0040,1400)       // Requested Procedure Comments
- (0040,0275)
- (0040,A124)
- (0040,A730)
- (0088,0130)       // Storage Media File-Set ID
- (5200,9229)       // Shared Functional Groups SQ

The second stage removes private tags and inserts important information into the header (clinical trial subject name, trial name, if it is benchmark data etc).