As defined in the ISO Standards referenced in this section, byte values used for encoded representations of characters are represented in this section as two decimal numbers in the form column/row.
This means that the value can be calculated as (column * 16) + row, e.g., 01/11 corresponds to the value 27 (1BH).
Note: Two digit hex notation will be used throughout the remainder of this standard to represent character encoding. The column/row notation is used only within Section 6.1 to simplify any cross referencing with applicable ISO standards.
The byte encoding space is divided into four ranges of values:
CL bytes from 00/00 to 01/15
GL bytes from 02/00 to 07/15
CR bytes from 08/00 to 09/15
GR bytes from 10/00 to 15/15
Note: ISO 8859 does not differentiate between a code element, e.g. G0, and the area in the code table, e.g. GL, where it is invoked. The term “G0” specifies the code element as well as the area in the code table. In ISO/IEC 2022 there is a clear distinction between the code elements (G0, G1, G2, and G3) and the areas in which the code elements are invoked (GL or GR). In this Standard the nomenclature of ISO/IEC 2022 is used.
The Control Character set C0 shall be invoked in CL and the Graphic Character sets G0 and G1 in GL and GR respectively. Only some Control Characters from the C0 set are used in DICOM (see Section 6.1.3), and characters from the C1 set shall not be used.