DICOM PS3.5 2021d - Data Structures and Encoding

H.2 Internet Practice (Current)
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## H.2 Internet Practice

DICOM has adopted an encoding method for Japanese character sets that is similar to the method for Internet practice.

The major protocols for the Internet such as SMTP, NNTP and HTTP adopt the encoding method for Japanese characters called "ISO-2022-JP" as described in RFC 1468, Japanese Character Encoding for Internet Messages. There is also a less commonly used Internet practice called "ISO-2022-JP-2" described in RFC 1554, which supports a larger repertoire of character sets and additionally requires an escape to a single-byte character set before encoding a SPACE (unlike DICOM and ISO-2022-JP).

The character sets supported for the Japanese language in DICOM and Internet practice are shown in Table H.2-1.

Table H.2-1. Character Sets for the Japanese language in DICOM and Internet practice

DICOM | ISO-2022-JP | ISO-2022-JP-2
--- | --- | ---
ASCII (ISO-IR 6) [JIS X 0201] Katakana (ISO-IR 13) [JIS X 0201] Romaji (ISO-IR 14) [JIS X 0208] Kanji (ISO-IR 87) [JIS X 0212] Kanji (ISO-IR 159) | ASCII (ISO-IR 6) [JIS X 0201] Romaji (ISO-IR 14) [JIS X 0208]-1978 Kanji (ISO-IR 42) [JIS X 0208]-1983 Kanji (ISO-IR 87) | ASCII (ISO-IR 6) [ISO/IEC 8859-1] (ISO-IR 100) [ISO/IEC 8859-7] Greek (ISO-IR 126) [JIS X 0201] Romaji (ISO-IR 14) [JIS X 0208]-1978 Kanji (ISO-IR 42) [JIS X 0208]-1983 Kanji (ISO-IR 87) [JIS X 0212] Kanji (ISO-IR 159) [GB 2312] (ISO-IR 58) [KS X 1001] (ISO-IR 149)

The Control Characters supported in DICOM and Internet practice are shown in Table H.2-2.

Table H.2-2. Control Characters Supported in DICOM and Internet practice

DICOM | ISO-2022-JP and ISO-2022-JP-2
--- | ---
LF (00/10) FF (00/12) CR (00/13) ESC (01/11) | LF (00/10) CR (00/13) SO (00/14) SI (00/15) ESC (01/11)

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DICOM PS3.5 2021d - Data Structures and Encoding