ANNEX L (Informative) RFC 3240 – Digital Imaging and Communications in Medicine (DICOM) – Application/dicom MIME Sub-type Registration

Network Working Group D. Clunie

Request for Comments: 3240 E. Cordonnier

Category: Informational DICOM Committee

February 2002

Digital Imaging and Communications in Medicine (DICOM) -

Application/dicom MIME Sub-type Registration

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard of any kind. Distribution of this

memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2002). All Rights Reserved.

Abstract

This document describes the registration of the MIME sub-type

application/dicom (Digital Imaging and Communications in Medicine).

The baseline encoding is defined by the DICOM Standards Committee in

"Digital Imaging and Communications in Medicine".

1. DICOM Definition

Digital Imaging and Communications in Medicine (DICOM) specifies

protocols and formats for the exchange of images, time-based

waveforms, reports, and associated information for medical

applications.

Individual DICOM objects (such as images) may be encapulsated in

files and exchanged by e-mail using the Media Type defined herein.

In addition, a set of DICOM files may be described by an index file,

DICOMDIR, which may accompany the files that it references.

2. IANA Registration

MIME media type name: Application

MIME subtype name: dicom

Required parameters:

"id" is constructed from a DICOM File ID (see DICOM PS3.11). The

total length is limited to 71 characters. Each component is

limited to 8 characters. The delimiter is a forward slash "/".

There is never a leading delimiter (i.e., this is not a

traditional path from a root directory).

If a DICOMDIR (which provides an index of files) is included, then

it will refer to other DICOM files in the file set by use of this

File ID. The File ID is not encoded within each DICOM file. If a

DICOMDIR is not present, then the "id" parameter may be absent.

Note that the DICOMDIR will also have a Media Type of

application/dicom and is distinguished from other files by its ID

of "DICOMDIR".

For example:

"ROOTDIR/SUBDIR1/MRSCAN/A789FD07/19991024/ST00234/S00003/I00023"

Each component shall be character strings made of characters from

a subset of the G0 repertoire of ISO 8859. This subset consists

of uppercase alphabetic characters, numeric characters and

underscore. The following characters are permissable:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V,

W, X, Y, Z (uppercase)

1, 2, 3, 4, 5, 6, 7, 8, 9, 0 and _ (underscore)

Optional parameters:

none

Encoding considerations:

The DICOM information is binary, therefore the encoding used shall

support lossless transfer of binary information. Typically, the

Content-Transfer-Encoding would be set to "Base64".

Multiple DICOM parts should be included as a Multipart/related

entity [2387]. Receiving agents shall also support multiple parts

as a Multipart/mixed entity. When multiple DICOM parts are

included, one of the parts may be a DICOMDIR, in which case, all

the files referred to by the DICOMDIR shall also be present. The

DICOMDIR is not required to be the first Application/dicom part

encoded in the message, in which case the optional "start"

parameter should refer to the content-id of the part containing

the DICOMDIR.

Multiple DICOM Application/dicom parts may be included with other

types of parts as a Multipart/mixed entity.

Security considerations:

Application/dicom parts contain medical information, including

individual demographic information. Accordingly, their exchange

should be restricted to a secure network or within a secure

wrapper that protects a patient's right to confidentiality

according to local and national policy. The specific security

mechanisms are outside the scope of this proposal. Such

mechanisms as Secured MIME (S/MIME) [2633] or similar might be

appropriate.

Interoperability considerations:

Because DICOM information is specific to the medical (imaging)

domain, generic e-mail applications may not be able to interpret

the information.

The Media Type has been designed in order to allow for

(i) DICOM aware applications to interoperate,

(ii) generic applications to save the files in a form

recognizable as DICOM files, that a DICOM application may

subsequently use.

Published specification:

The Digital Imaging and Communications in Medicine (DICOM)

Standard is a standard of the DICOM Standards Committee, published

by the National Electrical Manufacturers Association (NEMA), 1300

N. 17th Street, Rosslyn, Virginia 22209 USA,

(http://medical.nema.org).

Applications which use this media:

Biomedical imaging applications.

Additional information:

1. Magic number(s): "DICM" after 128 byte preamble indicates DICOM

PS 3.10 file

2. File extension(s): ".dcm" is recommended for files saved to

disk (other than DICOMDIR)

3. Macintosh file type code: Macintosh File Type "DICM" is

recommended

4. Object Identifiers: none

Person to contact for further information:

1. Name: Howard Clark

2. E-mail: how_clark@nema.org

Intended usage:

Common

Interchange of biomedical images.

Author/Change controller:

DICOM Standards Committee

3. References

[DICOM] DICOM Standards Committee, "Digital Imaging and

Communications in Medicine", 2001.

[2387] Levinson, E., "The MIME Multipart/Related Content-type", RFC

2387, August 1998.

[2633] Ramsdell, B., "S/MIME Version 3 Message Specification", RFC

2633, June 1999.

4. Authors' Addresses

David Clunie

RadPharm

943 Heiden Road

Bangor PA 18013

USA

Phone: +1-570-897-7123

Fax: +1-425-930-0171

EMail: dclunie@dclunie.com

Emmanuel Cordonnier

Etiam

20 rue du Pr J. Pecker

35000 Rennes

France

Phone: +33(0)299 14 33 88

Fax: +33(0)299 14 33 80

EMail: emmanuel.cordonnier@etiam.com

5. Full Copyright Statement

Copyright (C) The Internet Society (2002). All Rights Reserved.

This document and translations of it may be copied and furnished to

others, and derivative works that comment on or otherwise explain it

or assist in its implementation may be prepared, copied, published

and distributed, in whole or in part, without restriction of any

kind, provided that the above copyright notice and this paragraph are

included on all such copies and derivative works. However, this

document itself may not be modified in any way, such as by removing

the copyright notice or references to the Internet Society or other

Internet organizations, except as needed for the purpose of

developing Internet standards in which case the procedures for

copyrights defined in the Internet Standards process must be

followed, or as required to translate it into languages other than

English.

The limited permissions granted above are perpetual and will not be

revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an

"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING

TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION

HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

Funding for the RFC Editor function is currently provided by the

Internet Society.

L.2a EXAMPLE 1: SIMPLE DICOM FILE MIME MESSAGE (INFORMATIVE)

From: "Dr Smith" <smith@provider1.com>

To: "Dr Johnson" <johnson@provider2.com>

Subject: test DICOM Mime Type

Date: Fri, 5 Nov 1999 15:15:35 +0100

MIME-Version: 1.0

Content-Type: Multipart/mixed;

boundary="----=_NextPart_000_0027_01BF27A0.9BE21980"

This is a multi-part message in MIME format.

------=_NextPart_000_0027_01BF27A0.9BE21980

Content-Type: text/plain;

charset="iso-8859-1"

Content-Transfer-Encoding: 7bit

Message text: this is a DICOM MIME Type example for DICOM File.

------=_NextPart_000_0027_01BF27A0.9BE21980

Content-Type: Application/dicom;

id="i00023"; name="i00023.dcm"

Content-Transfer-Encoding: base64

byEAALcAAABbAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAABESUNNAgAAAFVMBACgAAAAAgABAE9CAAACAAAAAAECAAIAVUkaADEuMi44

NDAuMTAwMDguNS4xLjQuMS4xLjcAAgADAFVJFgBFeGFtaW5lZC1ieS1ESUNPTS4xLjEAAgAQAFVJ

FAAxLjIuODQwLjEwMDA4LjEuMi4xAAIAEgBVSRYAMS4yLjI1MC4xLjU5LjMuMC4zLjMuMQIAEwBT

SBAARVRJQU1fRENNVEtfMzMxIAgAAABVTAQAdgAAAAgAFgBVSRoAMS4yLjg0MC4xMDAwOC41LjEu

NC4xLjEuNwAIABgAVUkWAEV4YW1pbmVkLWJ5LURJQ09NLjEuMQAIACAAREEAAAgAMABUTQAACABQ

AFNIAAAIAGAAQ1MCAE9UCABkAENTBABXU0QgCACQAFBOAAAQAAAAVUwEAEYAAAAQABAAUE4QAERJ

Q09NIE1JTUVeVHlwZSAQACAATE8MAERJQ09NLVNVUDU0IBAAMABEQQgAMjAwMDAzMTAQAEAAQ1MC

AE0gIAAAAFVMBABkAAAAIAANAFVJEgBFeGFtaW5lZC1ieS1ESUNPTQAgAA4AVUkUAEV4YW1pbmVk

LWJ5LURJQ09NLjEAIAAQAFNIEgBFeGFtaW5lZC1ieS1ESUNPTSAgABEASVMCADEgIAATAElTAgAx

ICgAAABVTAQAZAAAACgAAgBVUwIAAQAoAAQAQ1MMAE1PTk9DSFJPTUUyICgACABJUwIAMSAoABAA

VVMCAB8AKAARAFVTAgAkACgAAAFVUwIACAAoAAEBVVMCAAgAKAACAVVTAgAHACgAAwFVUwIAAADg

fwAAVUwEAGgEAADgfxAAT0IAAFwEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAJJjosEAIAAAAACSY8

KAAPLS0tFgAAAB4tLS0AABZTW0QAAAA3YmUjBQAWLRYAAyI9IwAtt7e3t5APAIm3t7cAHqeniadb

AHq3mKC3PQBbt5AAAKC3WwAtt1sATLdxAACJtwAAkLceABY9JrdxAACgpw9bt7cmRLe3WwAtt1sA

AJi3AACJtwAAt4kAAAAAW7ctAABbty1bt5BxoIm3WwAtt1sAAJi3AACJtwAAt5gAAAAAW7c1AABj

ty1btya3pz23WwAtt1sATLdxAACJtwAAgbc9ACZMFreQDxanoABbtwCBWy23WwAtt7e3t5APAIm3

t7cAD5i3t7dEAD2nt7egHgBbtwAAAC23WwAPLS0tFgAAAB4tLS0AAAAeLQ8AAAAPLS0AAAAWLQAA

AA8tFgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAA8tHgAADy0eAB4tLS0AHi0PAAAeLQ8PLS0tLR4AAAAAAAAAAC23pw8AcbeJAIm3t7cAibdb

ABa3ty0tt7e3t4kAAAAAAAAAAC23t1sWt7eJAACJtwAAibenD3G3ty0tt1sAAAAAAAAAAAAAAC23

iaBxkLeJAACJtwAAiZinW7eBty0tt6CJiUQAAAAAAAAAAC23Pae3JreJAACJtwAAiYlbt5Bbty0t

t4lbWy0AAAAAAAAAAC23LVuBALeJAACJtwAAiYkWiTVbty0tt1sAAAAAAAAAAAAAAC23LQAAALeJ

AIm3t7cAiYkAAABbty0tt7e3t4kAAAAAAAAAAA8tDwAAAC0eAB4tLS0AHh4AAAAWLQ8PLS0tLR4A

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAWLS0tLS0mLRYAABYtDy0tLS0AABYtLS0tFgAAAAAAAAAAAABbt7e3t7c9p6cPD6CQALe3t7eg

Flu3t7e3WwAAAAAAAAAAAAAAAFu3LQAATLdqW7ceALeJAEy3W1u3LQAAAAAAAAAAAAAAAAAAAFu3

LQAAAJi3p1sAALeJAEy3U1u3mImJHgAAAAAAAAAAAAAAAFu3LQAAAB63oA8AALe3t7eQD1u3cVtb

FgAAAAAAAAAAAAAAAFu3LQAAAAC3iQAAALeYLR4AAFu3LQAAAAAAAAAAAAAAAAAAAFu3LQAAAAC3

iQAAALeJAAAAAFu3t7e3WwAAAAAAAAAAAAAAABYtDwAAAAAtHgAAAC0eAAAAABYtLS0tFgAAAAA=

------=_NextPart_000_0027_01BF27A0.9BE21980--

L.2b Example 2: DICOM File Set MIME message (Informative)

From: "Dr Johnson" <drjohnson@provider.org>

To: "Dr Smith" <drsmith@provider.org>

Subject: DICOM MIME sub-type file set example

Date: Sat, 9 Mar 2002 16:24:27 +0100

MIME-Version: 1.0

Content-Type: multipart/mixed;

boundary="----=_NextPart_000_0062_01C1C786.EA262CC0";

start="<header1@provider.org>";

type="text/plain"

This is a multi-part message in MIME format.

------=_NextPart_000_0062_01C1C786.EA262CC0

Content-Type: text/plain;

charset="iso-8859-1"

Content-Transfer-Encoding: 7bit

Content-ID: "<intro@provider.org>"

This is an example message containing a DICOM file set encoded following the

DICOM MIME sub-type (RFC3240).

------=_NextPart_000_0062_01C1C786.EA262CC0

Content-Type: text/plain;

name="header1.txt"

Content-Transfer-Encoding: quoted-printable

Content-Disposition: attachment;

filename="header1.txt"

Content-ID: "<header1@provider.org>"

Content-Description: Header of the medical message

This is the header part of the message, which contains:

- a first text document (letter1)

- a DICOM file set part (dicomfileset1) including an additional =

complementary note

This message was sent by Dr Johnson to Dr Smith.

It relates to the patient: DICOM Nema (M) 01/01/1993

------=_NextPart_000_0062_01C1C786.EA262CC0

Content-Type: multipart/related;

boundary="----=_NextPart_000_0062_01C1C786.EA262CC1_13487";

start="<dicomfileset1.dicomdir@provider.org>";

type="application/dicom"

------=_NextPart_000_0062_01C1C786.EA262CC1_13487

Content-Type: text/plain;

name="dicomfileset1note1.txt"

Content-Transfer-Encoding: 7bit

Content-Disposition: attachment;

filename="dicomfileset1note1.txt"

Content-ID: "<dicomfileset1.note1@provider.org>"

Content-Description: Note for the images use

This is a simple note, for receivers who can not read images.

These images are DICOM 3.0 images and the DICOMDIR index related file.

Please use a DICOM compatible application.

DICOM is a Standard Mark of Nema (www.nema.org).

------=_NextPart_000_0062_01C1C786.EA262CC1_13487

Content-Type: application/dicom;

id="DICOMDIR";

name="Dicomdir"

Content-Transfer-Encoding: base64

Content-Disposition: attachment;

filename="Dicomdir";

Content-ID: "<dicomfileset1.dicomdir@provider.org>"

Content-Description: Index of the images (DICOMDIR)

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAABESUNNAgAAAFVMBACIAAAAAgABAE9CAAACAAAAAQACAAIAVUkUADEuMi44

NDAuMTAwMDguMS4zLjEwAgADAFVJIAAxLjIuMjUwLjEuNTkuMi40Mi4yMDAyMDMwOTE2NDkyMAIA

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TAQAjAIAAAQAMBRDUwYAU1RVRFkgCAAgAERBCAAyMDAyMDMwOQgAMABUTQYAMTYwMzI1CABQAFNI

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uAAAAAQAABRVTAQA2gMAAAQAEBRVUwIA//8EACAUVUwEAAAAAAAEADAUQ1MGAElNQUdFIAQAABVD

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MS4yLjg0MC4xMDAwOC4xLjIuMQAIAAgAQ1MAACAAEwBJUwIAMgA=

------=_NextPart_000_0062_01C1C786.EA262CC1_13487

Content-Type: application/dicom;

id="SE0001/I0001";

name="I0001.dcm"

Content-Transfer-Encoding: base64

Content-Disposition: attachment;

filename="I0001.dcm"

Content-ID: "<dicomfileset1.se0001.i0001@provider.org>"

Content-Description: Color image

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAABESUNNAgAAAFVMBACmAAAAAgABAE9CAAACAAAAAQACAAIAVUkaADEuMi44

NDAuMTAwMDguNS4xLjQuMS4xLjcAAgADAFVJHAAxLjIuMjUwLjEuNTkuMTIzLjQ1Ni43ODkuMS4x

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09Oo2dm11tau8fHj////+/v4/v7+/////////v7++/v4/Pz6/f38////////////////////////

////////////////////////////////////////////

------=_NextPart_000_0062_01C1C786.EA262CC1_13487

Content-Type: application/dicom;

id="SE0001/I0002";

name="I0002.dcm"

Content-Transfer-Encoding: base64

Content-Disposition: attachment;

filename="I0002.dcm"

Content-ID: "<dicomfileset1.se0001.i0002@provider.org>"

Content-Description: B&W image

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAABESUNNAgAAAFVMBACmAAAAAgABAE9CAAACAAAAAQACAAIAVUkaADEuMi44

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KAADAVVTAgAAAOB/AABVTAQACgMAAOB/EABPQgAA/gIAAP/////98dPX5O//////////////////

/////////////////////////////////////////dCcjY2OnqW1yufa2tra6f///+Xa3f///+W5

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///////////59/r/////+Pj/////////////////////////////////////////////////////

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