6.1.3 CONTROL CHARACTERS

Textual data that is interchanged may require some formatting information. Control Characters are used to indicate formatting, but their use in DICOM is kept to a minimum since some machines may handle them inappropriately. ISO 646:1990 and ISO 6429:1990 define Control Characters. As shown in Table 6.1-1 below, only a subset of four Control Characters from the C0 set shall be used in DICOM for the encoding of Control Characters in text strings.

Table 6.1-1 DICOM CONTROL CHARACTERS AND THEIR ENCODING

Acronym Name Coded Value
LF Line Feed 00/10
FF Form Feed 00/12
CR Carriage Return 00/13
ESC Escape 01/11

In text strings a new line shall be represented as CR LF.

Note: Some machines (such as UNIX based machines) may interpret LF (00/10) as a new line. In such cases, it is expected that the DICOM format is converted to the correct internal representation for that machine.