NLST Images -- General Details
Dates
The Study Dates are fictitious. While appearing real, they are coded to represent the 3 screening years:
- 19990102 -- Screening Year 0
- 20000102 -- Screening Year 1
- 20010102 -- Screening Year 2
Patient Identifiers
The Patient Identifiers (PIDs), in DICOM tag (0010, 0020) Patient ID, are 6 digit random numbers assigned by IMS. They are called IMS-Global-IDs. PIDs beginning with '1' are LSS images; those beginning with '2' are ACRIN images; examples:
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- 2542 is an ACRIN prior-PID
- 18519 is an ACRIN prior-PID
- 022921 is an LSS prior-PID that may also be rendered as 22921
Patient Names
Patient Names appearing in DICOM tag (0010, 0010) are a construct from the participant's prior PID concatenated with a caret and the string 'ACRIN' or 'LSS'; examples:
- 2542^ACRIN
- 18519^ACRIN
- 022921^LSS
Series Descriptions
The original Series Descriptions, if present, were often vague and/or, at best, inconsistent.
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