Medical [Dicom]

For medical information software, the Dicom standard is a standard that has to be studied. The DICOM standard defines 27 basic data types in PS3.5, the so-called value representation (VR, value representations). The value expression is used to encapsulate all possible clinical data types. Anything written in DICOM must conform to one of these 27 basic data types. Each VR is an acronym for two English letters. The following table lists the definitions for these 27 basic data types.

DICOM VR (Value representations) table

Vr	containing righteousness	allowed Xu the character	Data Long degree
CS -Code String Code string	A string that can have meaningless spaces at the beginning, such as "Cd123_4"	Uppercase letters, 0-9, spaces, and underscore characters	Maximum of 16 characters
SH -Short String Short string	Short strings, such as: phone number, ID, etc.		Maximum of 16 characters
LO -Long String Long string	A string that may be filled with spaces at the beginning and end. Like "Introduction to DICOM."		Maximum of 64 characters
ST -Short Text Short book	A string that may contain one or more paragraphs		Maximum of 1024 characters
LT -Long Text Short book	A string that may contain one or more workouts, same as lo, but can be longer		Maximum of 10,240 characters
UT -Unlimited Text Unlimited text	A string containing one or more paragraphs, similar to LT		Up to (2 of 32 square –2) characters
AE -Application Entity Apply Entity	A string that identifies the name of a device that can have meaningless characters at the beginning and end. Like "MyPC01."		Maximum of 16 characters
PN -person Name Patient Name	A patient name with a caret (^) as the name separator. such as "Smith^john" "morrison-jones^susan^ ^^ Ph.D, chief Executive Officer"		Maximum of 64 characters
UI -Unique Identifier (UID) Unique identifiers	A string that is used to uniquely identify the containing UID for each type of item. Like "1.2.840.10008.1.1."	0-9 and half-width periods (.)	Maximum of 64 characters
DA -Date Date	The format is YYYYMMDD string; YYYY represents the year; MM represents the month; DD represents the day. For example, "20050822" means August 22, 2005.	0-9	8 characters
TM -time Time	A string formatted as HHMMSS. FRAC; HH denotes hours (range "XX"-"All"), MM indicates minutes (range "00"-"59"), while FRAC contains the number of seconds, i.e. one out of 10,000 seconds. For example, "183200.00" means 6:32.	0-9 and half-width periods (.)	Maximum of 16 characters
DT -Date time Date Time	The format is YYYYMMDDHHMMSS. FFFFFF, concatenated date-time string. The parts of the string are from left to right: year YYYY, month mm, DD, hour HH, minute mm, second SS, fractional FFFFFF of seconds. For example, 20050812183000.00 "means August 12, 2005, 18:30 P.M., 00 seconds.	0-9, plus, minus and half-width periods	Maximum of 26 characters
AS-age String Age string	A string that conforms to the following format: Nnnd, NNNW, nnnm, Nnny; where nnn represents the number of days for D, the number of weeks for W, the number of months for M, and the age for Y. For example, "018M" means his age is 18 months.	0–9, D, W,m, Y	4 characters
is-Integer String Integer string	A string that represents an integer number. Like "-1234567"	0-9, plus (+), minus (-)	Maximum of 12 characters
DS -Decimal string decimals	Represents fixed-point decimals and floating-point decimals. Like "12345.67", " -5.0e3."	0-9, plus (+), minus (-), up to 16 characters e,e and half-width periods (.)	Maximum of 16 characters
SS -Signed short Signed Short type	Symbolic binary integer, 16 bits in length		2 characters
US -Unsigned short unsigned shorter type	Unsigned binary integer, 16 bits in length		2 characters
SL -Signed Long Signed Long type	Signed binary integers		4 characters
UL -Unsigned long unsigned type	Unsigned binary integer, 32 bits in length		4 characters
at-Attribute Tag Property labels	Ordered pairs of 16-bit unsigned integers, labels for data elements		4 characters
FL -floating single precision floating point	Single-precision binary floating-point numbers		4 characters
FD -floating point Double Double-precision binary floating-point numbers	Double-precision binary floating-point numbers		8 characters
OB -Other Byte String Other byte strings	Byte string ("Other" means no content defined in VR)
OW -Other Word String Other word strings	16-bit (2-byte) word string
of-Other Float String Other floating-point strings	32-bit (4-byte) floating-point word string
SQ -Sequence Items Entry sequence	Sequence of entries
UN –unknown Unknown	A byte string in which the content is encoded in an unknown way

Medical [Dicom]