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DICOM PS3.5 2020a - Data Structures and Encoding​

Page 41​

VR Name​

Definition​

Character Repertoire​

Length of Value​

 

A concatenated date-time character string in the format:​

 

 

YYYYMMDDHHMMSS.FFFFFF&ZZXX​

The components of this string, from left to right, are YYYY = Year,​

MM = Month, DD = Day, HH = Hour (range "00" - "23"), MM =​

Minute (range "00" - "59"), SS = Second (range "00" - "60").​

FFFFFF=FractionalSecondcontainsafractionalpartofasecond​ as small as 1 millionth of a second (range "000000" - "999999").​

&ZZXX is an optional suffix for offset from Coordinated Universal​ Time (UTC), where & = "+" or "-", and ZZ = Hours and XX =​ Minutes of offset.​

The year, month, and day shall be interpreted as a date of the​

Gregorian calendar system.​

A 24-hour clock is used. Midnight shall be represented by only​ "0000" since "2400" would violate the hour range.​

The Fractional Second component, if present, shall contain 1 to 6​ digits. If Fractional Second is unspecified the preceding "." shall​ not be included. The offset suffix, if present, shall contain 4 digits.​ ThestringmaybepaddedwithtrailingSPACEcharacters.Leading​ and embedded spaces are not allowed.​

A component that is omitted from the string is termed a null​ component. Trailing null components of Date Time indicate that​ the value is not precise to the precision of those components. The​ YYYY component shall not be null. Non-trailing null components​ are prohibited. The optional suffix is not considered as a​ component.​

A Date Time value without the optional suffix is interpreted to be​ inthelocaltimezoneoftheapplicationcreatingtheDataElement,​ unless explicitly specified by the Timezone Offset From UTC​ (0008,0201).​

UTC offsets are calculated as "local time minus UTC". The offset​ for a Date Time value in UTC shall be +0000.​

Note​

1.​The range of the offset is -1200 to +1400. The offset​ for United States Eastern Standard Time is -0500.​ The offset for Japan Standard Time is +0900.​

2.​The RFC 2822 use of -0000 as an offset to indicate​ local time is not allowed.​

3.​A Date Time value of 195308 means August 1953,​ not specific to particular day. A Date Time value of​ 19530827111300.0 means August 27, 1953, 11;13​ a.m. accurate to 1/10th second.​

4.​TheSecondcomponentmayhaveavalueof60only​ for a leap second.​

- Standard -​

Page 42​

DICOM PS3.5 2020a - Data Structures and Encoding​

 

VR Name​

Definition​

Character Repertoire​

Length of Value​

 

5.​The offset may be included regardless of null​

 

 

 

components; e.g., 2007-0500 is a legal value.​

 

 

FL​

Single precision binary floating point number represented in IEEE​not applicable​

4 bytes fixed​

 

754:1985 32-bit Floating Point Number Format.​

 

 

Floating Point​

 

 

Single​

 

 

 

FD​

DoubleprecisionbinaryfloatingpointnumberrepresentedinIEEE​not applicable​

8 bytes fixed​

 

754:1985 64-bit Floating Point Number Format.​

 

 

Floating Point​

 

 

Double​

 

 

 

IS​

AstringofcharactersrepresentinganIntegerinbase-10(decimal),​"0"-"9","+","-"andtheSPACE​12bytesmaximum​

 

shall contain only the characters 0 - 9, with an optional leading "+"​characterofDefaultCharacter​

Integer String​or "-". It may be padded with leading and/or trailing spaces.​

Repertoire​

 

 

Embedded spaces are not allowed.​

 

 

LO​

Long String​

LT​

Long Text​

The integer, n, represented shall be in the range:​ -231<= n <= (231-1).​

A character string that may be padded with leading and/or trailing​Default Character Repertoire​64charsmaximum​

spaces. The character code 5CH (the BACKSLASH "\" in ISO-IR​and/or as defined by​

(see Note in​

6) shall not be present, as it is used as the delimiter between​

(0008,0005) excluding​

Section 6.2)​

values in multi-valued data elements. The string shall not have​ character code 5CH (the​

 

Control Characters except for ESC.​

BACKSLASH "\" in ISO-IR 6),​

 

and all Control Characters​

 

except ESC when used for​ ISO 2022 escape sequences.​

A character string that may contain one or more paragraphs. It​ Default Character Repertoire​10240 chars​

maycontaintheGraphicCharactersetandtheControlCharacters,​and/or as defined by​

maximum (see​

CR,LF,FF,andESC.Itmaybepaddedwithtrailingspaces,which​(0008,0005)excludingControl​Note in Section​

may be ignored, but leading spaces are considered to be​

Characters except TAB, LF,​6.2)​

significant. Data Elements with this VR shall not be multi-valued​FF, CR (and ESC when used​

and therefore character code 5CH (the BACKSLASH "\" in ISO-IR​for ISO 2022 escape​

 

6) may be used.​

sequences).​

 

OB​

Other Byte​

An octet-stream where the encoding of the contents is specified​not applicable​

see Transfer​

by the negotiated Transfer Syntax. OB is a VR that is insensitive​

Syntax definition​

to byte ordering (see Section 7.3). The octet-stream shall be​

 

padded with a single trailing NULL byte value (00H) when​

 

necessary to achieve even length.​

 

OD​

A stream of 64-bit IEEE 754:1985 floating point words. OD is a​ not applicable​

232-8 bytes​

 

VR that requires byte swapping within each 64-bit word when​

maximum​

Other Double​changing byte ordering (see Section 7.3).​

 

OF​

Astreamof32-bitIEEE 754:1985floating pointwords.OFisa VR​not applicable​

232-4 bytes​

Other Float​

thatrequiresbyteswappingwithineach32-bitwordwhenchanging​

maximum​

byte ordering (see Section 7.3).​

 

OL​

Other Long​

A stream of 32-bit words where the encoding of the contents is​ not applicable​

see Transfer​

specified by the negotiated Transfer Syntax. OL is a VR that​

Syntax definition​

requires byte swapping within each word when changing byte​

 

ordering (see Section 7.3).​

 

OV​

Other 64-bit​

Very Long​

A stream of 64-bit words where the encoding of the contents is​ not applicable​

see Transfer​

specified by the negotiated Transfer Syntax. OV is a VR that​

Syntax definition​

requires byte swapping within each word when changing byte​

 

ordering (see Section 7.3).​

 

- Standard -​

DICOM PS3.5 2020a - Data Structures and Encoding​

Page 43​

VR Name​

OW​

Other Word​

Definition​

Character Repertoire​

Length of Value​

A stream of 16-bit words where the encoding of the contents is​ not applicable​

see Transfer​

specified by the negotiated Transfer Syntax. OW is a VR that​

 

Syntax definition​

requires byte swapping within each word when changing byte​

 

 

ordering (see Section 7.3).​

 

 

PN​

A character string encoded using a 5 component convention. The​Default Character Repertoire​64charsmaximum​

 

character code 5CH (the BACKSLASH "\" in ISO-IR 6) shall not​and/or as defined by​

per component​

Person Name​be present, as it is used as the delimiter between values in​

(0008,0005) excluding​

group​

 

multi-valueddataelements.Thestringmaybepaddedwithtrailing​character code 5CH (the​

 

 

spaces. For human use, the five components in their order of​

BACKSLASH "\" in ISO-IR 6)​(see Note in​

 

occurrenceare:familynamecomplex,givennamecomplex,middle​and all Control Characters​

Section 6.2)​

 

name, name prefix, name suffix.​

except ESC when used for​

 

 

Note​

ISO 2022 escape sequences.​

 

 

 

HL7prohibitsleadingspaceswithinacomponent;DICOM​ allows leading and trailing spaces and considers them​ insignificant.​

Any of the five components may be an empty string. The​ component delimiter shall be the caret "^" character (5EH). There​ shall be no more than four component delimiters, i.e., none after​ the last component if all components are present. Delimiters are​ requiredforinteriornullcomponents.Trailingnullcomponentsand​ their delimiters may be omitted. Multiple entries are permitted in​ each component and are encoded as natural text strings, in the​ format preferred by the named person.​

For veterinary use, the first two of the five components in their​ order of occurrence are: responsible party family name or​ responsible organization name, patient name. The remaining​ components are not used and shall not be present.​

This group of five components is referred to as a Person Name​ component group.​

For the purpose of writing names in ideographic characters and​ in phonetic characters, up to 3 groups of components (see Annex​ H,AnnexIandAnnexJ)maybeused.Thedelimiterforcomponent​ groups shall be the equals character "=" (3DH). There shall be no​ more than two component group delimiters, i.e., none after the​ last component group if all component groups are present. The​ threecomponentgroupsofcomponentsintheirorderofoccurrence​ are: an alphabetic representation, an ideographic representation,​ and a phonetic representation.​

Anycomponentgroupmaybeabsent,includingthefirstcomponent​ group. In this case, the person name may start with one or more​ "=" delimiters. Delimiters are required for interior null component​ groups. Trailing null component groups and their delimiters may​ be omitted.​

Precise semantics are defined for each component group. See​

Section 6.2.1.2.​

For examples and notes, see Section 6.2.1.1.​

- Standard -​

Page 44​

DICOM PS3.5 2020a - Data Structures and Encoding​

VR Name​

SH​

Short String​

Definition​ Character Repertoire​ Length of Value​

A character string that may be padded with leading and/or trailing​Default Character Repertoire​16charsmaximum​

spaces.Thecharactercode05CH(theBACKSLASH"\"inISO-IR​and/or as defined by​

(see Note in​

6) shall not be present, as it is used as the delimiter between​

(0008,0005) excluding​

Section 6.2)​

valuesformultipledataelements.ThestringshallnothaveControl​character code 5CH (the​

 

Characters except ESC.​

BACKSLASH "\" in ISO-IR 6)​

 

and all Control Characters​

 

 

except ESC when used for​

 

 

ISO 2022 escape sequences.​

SL​

Signed binary integer 32 bits long in 2's complement form.​

not applicable​

4 bytes fixed​

Signed Long​Represents an integer, n, in the range:​

 

 

 

- 231<= n <= 231-1.​

 

 

SQ​

Value is a Sequence of zero or more Items, as defined in​

not applicable (see​

notapplicable(see​

Sequence of​

Section 7.5.​

Section 7.5)​

Section 7.5)​

 

 

 

Items​

 

 

 

SS​

Signed binary integer 16 bits long in 2's complement form.​

not applicable​

2 bytes fixed​

 

Represents an integer n in the range:​

 

 

Signed Short​

-215<= n <= 215-1.​

ST​

Short Text​

A character string that may contain one or more paragraphs. It​ Default Character Repertoire​1024 chars​

maycontaintheGraphicCharactersetandtheControlCharacters,​and/or as defined by​

maximum (see​

CR,LF,FF,andESC.Itmaybepaddedwithtrailingspaces,which​(0008,0005)excludingControl​Note in Section​

may be ignored, but leading spaces are considered to be​

Characters except TAB, LF,​6.2)​

significant. Data Elements with this VR shall not be multi-valued​FF, CR (and ESC when used​

and therefore character code 5CH (the BACKSLASH "\" in ISO-IR​for ISO 2022 escape​

 

6) may be used.​

sequences).​

 

SV​

Signed binary integer 64 bits long. Represents an integer n in the​not applicable​

8 bytes fixed​

 

range:​

 

Signed 64-bit​

 

Very Long​

- 263<= n <= 263-1.​

 

- Standard -​

DICOM PS3.5 2020a - Data Structures and Encoding​

Page 45​

VR Name​

TM​

Time​

UC​

Unlimited​

Characters​

Definition​

Character Repertoire​

Length of Value​

A string of characters of the format HHMMSS.FFFFFF; where HH​"0"-"9", "." and the SPACE​

14bytesmaximum​

contains hours (range "00" - "23"), MM contains minutes (range​characterofDefaultCharacter​

"00"-"59"),SScontainsseconds(range"00"-"60"),andFFFFFF​Repertoire​

In the context of a​

contains a fractional part of a second as small as 1 millionth of a​

 

Query with range​

second (range "000000" - "999999"). A 24-hour clock is used.​ In the context of a Query with​matching (see​ Midnight shall be represented by only "0000" since "2400" would​range matching (see PS3.4),​PS3.4), the length​

violate the hour range. The string may be padded with trailing​

the character "-" is allowed.​ is 28 bytes​

spaces. Leading and embedded spaces are not allowed.​

maximum.​

One or more of the components MM, SS, or FFFFFF may be​ unspecified as long as every component to the right of an​ unspecified component is also unspecified, which indicates that​ the value is not precise to the precision of those unspecified​ components.​

The FFFFFF component, if present, shall contain 1 to 6 digits. If​

FFFFFF is unspecified the preceding "." shall not be included.​

Examples:​

1.​"070907.0705 " represents a time of 7 hours, 9 minutes and​ 7.0705 seconds.​

2.​"1010" represents a time of 10 hours, and 10 minutes.​

 

 

3.​"021 " is an invalid value.​

 

 

Note​

 

 

1.​The ACR-NEMA Standard 300 (predecessor to​

 

 

DICOM) supported a string of characters of the​

 

 

formatHH:MM:SS.fracforthisVR.Useofthisformat​

 

 

is not compliant.​

 

 

2.​See also DT VR in this table.​

 

 

3.​The SS component may have a value of 60 only for​

 

 

a leap second.​

 

 

A character string that may be of unlimited length that may be​

Default Character Repertoire​232-2 bytes​

padded with trailing spaces. The character code 5CH (the​

and/or as defined by​

maximum​

BACKSLASH "\" in ISO-IR 6) shall not be present, as it is used as​(0008,0005) excluding​

See Note 2​

the delimiter between values in multi-valued data elements. The​character code 5CH (the​

string shall not have Control Characters except for ESC.​

BACKSLASH "\" in ISO-IR 6),​

 

and all Control Characters​

 

 

except ESC when used for​

 

 

ISO 2022 escape sequences.​

UI​

AcharacterstringcontainingaUIDthatisusedtouniquelyidentify​"0"-"9","."ofDefaultCharacter​64bytesmaximum​

Unique​

awidevarietyofitems.TheUIDisaseriesofnumericcomponents​Repertoire​

 

separated by the period "." character. If a Value Field containing​

 

Identifier(UID)​

 

 

one or more UIDs is an odd number of bytes in length, the Value​

 

 

Field shall be padded with a single trailing NULL (00H) character​

 

 

toensurethattheValueFieldisanevennumberofbytesinlength.​

 

 

See Section 9 and Annex B for a complete specification and​

 

 

examples.​

 

UL​

Unsigned binary integer 32 bits long. Represents an integer n in​not applicable​

4 bytes fixed​

Unsigned​

the range:​

 

0 <= n < 232.​

 

Long​

 

- Standard -​

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