Table 1.
Template TID 1400—Linear Measurement
| Row | Nesting Level | Relationship with Parent | Value Type | Concept Name | Value Multiplicity | Requirement | Condition | Value Set Constraint |
|---|---|---|---|---|---|---|---|---|
| 1 | NUMa | DCID (7470) “Linear Measurements”b | 1 | M | UNITS = DCID (7460) “Units of Linear Measurement”c | |||
| 2 | > | INFERRED FROM | SCOORDd | (121055,DCM, “Path”)e | 1 | M | ||
| 3 | >> | R-SELECTED FROMf | IMAGE | 1 | MCg | XOR Row 4 | ||
| 4 | >> | SELECTED FROM | IMAGE | 1 | MC | XOR Row 3 |
Note the following explanations of the features of this template:
This template is used by other templates by inclusion; the root node of this sub-template is a single numeric measurement content item (of type NUM), which consists of a coded concept name, a single numeric value and a coded unit; only one of these content items may be present, as indicated by a value multiplicity of 1, and it is required be present, as indicated by the requirement of mandatory (M).
The concept name used for the numeric content item shall be one of a set of codes list in the context group DCID 7470, which contains a list of linear measurement types. See Table 2.
The units of the numeric content item shall be one of a set of codes list in the context group DCID 7460, which contains a list of linear measurement types. See Table 3.
Additional textual description in the standard, not included in the tabular representation, constrains the form of the SCOORD to be either a POLYLINE, CIRCLE or ELLIPSE.
The concept name for the spatial coordinates content item is a single coded value, which happens to be from the DICOM terminology.
The image to which the coordinates specified in the parent content item apply may either be present as a child item (as specified by row 4), or a reference to another location elsewhere in the content tree (as specified by row 3 and indicated by the “R-” prefix to the relationship, which means “reference”); in the latter case the structure would not be a tree but a directed acyclic graph.
Rows 3 and 4 illustrate the use of a mandatory conditional (MC) requirement with a formally described exclusive-or condition and a multiplicity of one, in order to specify that a content item instantiating one or the other row shall be present but not both.