DICOM PS3.5 2021d - Data Structures and Encoding

6.4 Value Multiplicity (VM) and Delimitation (Current)
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## 6.4 Value Multiplicity (VM) and Delimitation

The Value Multiplicity of a Data Element specifies the number of Values that can be encoded in the Value Field of that Data Element. The VM of each Data Element is specified explicitly in PS3.6. If the number of Values that may be encoded in an element is variable, it shall be represented by two numbers separated by a dash; e.g., "1-10" means that there may be 1 to 10 Values in the element.

### Note

Elements having a multiplicity of "S", which represented "single", in older versions of this Standard, will have a multiplicity of "1" in this version of this Standard.

When a Data Element has multiple Values, those Values shall be delimited as follows:

- For character strings, the character 5CH (BACKSLASH "\" in the case of the repertoire ISO IR-6) shall be used as a delimiter between Values.

  ### Note

  BACKSLASH ("\") is used as a delimiter between character string Values that are of fixed length as well as variable length.

- Multiple binary Values of fixed length shall be a series of concatenated Values without any delimiter.

Each string Value in a multi-valued character string may be of even or odd length, but the length of the entire Value Field (including "\" delimiters) shall be of even length. If padding is required to make the Value Field of even length, a single padding character shall be applied to the end of the Value Field (to the last Value), in which case the length of the last Value may exceed the Length of Value by 1.

### Note

A padding character may need to be appended to a fixed length character string value in the above case.

Only the last UID Value in a multi-valued Data Element with a VR of UI shall be padded with a single trailing NULL (00H) character when necessary to ensure that the entire Value Field (including "\" delimiters) is of even length.

Data Elements with a VR of LT, OB, OD, OF, OL, OW, SQ, ST, UN, UR or UT shall always have a Value Multiplicity of one. See Table 6.2-1.

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DICOM PS3.5 2021d - Data Structures and Encoding