[Dcmlib] Problem of parsing :Hopeless !
Mathieu Malaterre
mathieu.malaterre at kitware.com
Tue Jan 24 16:15:39 CET 2006
From PS5: "THE ENTIRE DATASET"...ouch !
Mathieu
A.5 DICOM DEFLATED LITTLE ENDIAN TRANSFER SYNTAX (EXPLICIT VR)
This Transfer Syntax applies to the encoding of the entire DICOM Data Set.
The entire Data Set is first encoded according to the rules specified in
Section A.2 DICOM Little Endian Transfer Syntax (Explicit VR). The
entire byte stream is then compressed using the "Deflate" algorithm
defined in Internet RFC 1951.
Notes: 1. The Pixel Data (7FE0,0010) is not handled in any special
manner. The pixel data is first encoded as sequential uncompressed
frames without encapsulation, and then is handled as part of the byte
stream fed to the "deflate" compressor in the same manner as the value
of any other attribute. 2. This transfer syntax is particularly useful
for compression of objects without pixel data, such as structured
reports. It is not particularly effective at image compression, since
any benefit obtained from compressing the non-pixel data is offset by
less effective compression of the much larger pixel data. 3. A freely
available reference implementation of the "deflate" compressor may be
found in the zlib package, which may be downloaded from
ftp://ftp.uu.net/pub/archiving/zip/zlib/.
In order to facilitate interoperability of implementations conforming to
the DICOM Standard which elect to use this Transfer Syntax, the
following policy is specified:
Any implementation which has elected to support the Deflated Explicit
VR Little Endian Transfer Syntax for any Abstract Syntax, shall also
support the Explicit VR Little Endian Transfer for that Abstract Syntax
Notes: 1.This requirement to support the (uncompressed) Explicit VR
Little Endian Transfer Syntax is in order to ensure full-fidelity
exchange of VR information in the case that the Association Acceptor
does not support the Deflated Explicit VR Little Endian Transfer Syntax.
The requirement specified in Section 10.1 of this part, that the Default
Implicit VR Little Endian Transfer Syntax be supported by all
implementations except those that only have access to lossy compressed
pixel data, is not waived. In otherwords, an implementation must support
all three transfer syntaxes. 2. There are no such "baseline"
requirements on media, since such requirements are at the discretion of
the Media Application Profile. Furthermore, sufficient object
"management" information should be present in the DICOMDIR even if an
individual application cannot decompress an instance encoded with the
deflated transfer syntax.
This DICOM Deflated Explicit VR Little Endian Transfer Syntax shall be
identified by a UID of Value "1.2.840.10008.1.2.1.99".
Jean-Pierre Roux wrote:
> Mathieu.
>
> I give up !
> The header is just a mess :-(
> Have a look a the output of hexedit vs the output of PrintFile/
> gdcm Parser does the job correctly.
> The problem comes from the header is *not* correct at all.
> The supposed to be DataElement *5ae4|707d *has *no* Explicit VR,
> therefore its length *is* x(3f75d754).
> It looks like a part of the header vanished at write time ...
> Could you tell it to David Clunie.
> Thx
> JP
>
> D 0002|0000 lg : x(4) 4 Off.: x(8c) 140
> [UL] [Group Length] [170]
> D 0002|0001 lg : x(2) 2 Off.: x(9c) 156
> [OB] [File Meta Information Version] [gdcm::Binary data
> loaded;length = 2]
> D 0002|0002 lg : x(1e) 30 Off.: x(a6) 166
> [UI] [Media Storage SOP Class UID]
> [1.2.840.10008.5.1.4.1.1.9.2.1 ] ==> [Hemodynamic Waveform Storage]
> D 0002|0003 lg : x(14) 20 Off.: x(cc) 204
> [UI] [Media Storage SOP Instance UID] [1.3.6.1.4.1.6018.1.1]
> D 0002|0010 lg : x(16) 22 Off.: x(e8) 232
> [UI] [Transfer Syntax UID] [1.2.840.10008.1.2.1.99]
> ==> [Deflated Explicit VR - Little Endian]
> D 0002|0012 lg : x(12) 18 Off.: x(106) 262 [UI
> [Implementation Class UID] [1.3.6.1.4.1.5962.2]
> D 0002|0013 lg : x(a) 10 Off.: x(120) 288
> [SH] [Implementation Version Name] [DCTOOL100 ]
> D 0002|0016 lg : x(8) 8 Off.: x(132) 306
> [AE] [Source Application Entity Title] [CLUNIE1 ]
> D *5ae4|707d* lg : x(3f75d754) 1064687444 Off.: x(142) 322 [
> ] [gdcm::Unknown] [gdcm::NotLoaded]
>
> 00000080 44 49 43 4D 02 00 00 00 55 4C 04 00 AA 00 00 00
> DICM....UL......
> 00000090 02 00 01 00 4F 42 00 00 02 00 00 00 00 01 02 00
> ....OB..........
> 000000A0 02 00 55 49 1E 00 31 2E 32 2E 38 34 30 2E 31 30
> ..UI..1.2.840.10
> 000000B0 30 30 38 2E 35 2E 31 2E 34 2E 31 2E 31 2E 39 2E
> 008.5.1.4.1.1.9.
> 000000C0 32 2E 31 00 02 00 03 00 55 49 14 00 31 2E 33 2E
> 2.1.....UI..1.3.
> 000000D0 36 2E 31 2E 34 2E 31 2E 36 30 31 38 2E 31 2E 31
> 6.1.4.1.6018.1.1
> 000000E0 02 00 10 00 55 49 16 00 31 2E 32 2E 38 34 30 2E
> ....UI..1.2.840.
> 000000F0 31 30 30 30 38 2E 31 2E 32 2E 31 2E 39 39 02 00
> 10008.1.2.1.99..
> 00000100 12 00 55 49 12 00 31 2E 33 2E 36 2E 31 2E 34 2E
> ..UI..1.3.6.1.4.
> 00000110 31 2E 35 39 36 32 2E 32 02 00 13 00 53 48 0A 00
> 1.5962.2....SH..
> 00000120 44 43 54 4F 4F 4C 31 30 30 20 02 00 16 00 41 45 DCTOOL100
> ....AE
> 00000130 08 00 43 4C 55 4E 49 45 31 20 *E4 5A 7D 70* 54 D7
> ..CLUNIE1 .Z}pT.
> 00000140 75 3F FB B4 88 F5 46 96 17 81 65 45 C6 F8 45 26
> u?....F...eE..E&
> 00000150 84 61 CC 76 B5 FA 40 50 E2 41 48 02 44 85 A4 48
> .a.v.. at P.AH.D..H
> 00000160 8B 62 33 1E 82 30 F2 80 07 63 55 96 3D 1E 9A 50
> .b3..0...cU.=..P
> 00000170 DB CD 87 43 1C 86 A1 AE ED F1 10 17 63 EA 3A D8
> ...C........c.:.
> 00000180 25 84 52 E2 32 C4 A5 0C 65 18 A2 51 55 57 C1 84
> %.R.2...e..QUW..
> 00000190 60 82 55 55 96 65 59 56 D7 62 59 8B D5 3B FD 9D
> `.UU.eYV.bY..;..
> 000001A0 F3 DE 4A FB 56 72 CB DF 81 9D A7 7D EF F7 CE 3D
> ..J.Vr.....}...=
> 000001B0 F7 DC F3 75 CF 3D 8B 8F 72 A8 B2 DC 47 E1 50 28
> ...u.=..r...G.P(
> 000001C0 54 18 0A 15 F9 68 26 45 D6 64 52 61 69 49 49 E1
> T....h&E.dRaiII.
> 000001D0 62 1F E5 D2 DA EA 39 54 18 0C 07 CB 8A 43 41 50
> b.....9T.....CAP
> 000001E0 84 CA 82 25 C1 C2 60 31 AE C2 E0 62 E0 85 E4 A3
> ...%..`1...b....
> 000001F0 3C 50 E5 82 AA 28 58 EA BC 2B 0D 15 96 E1 71 F1
> <P...(X..+....q.
> 00000200 62 F0 30 75 86 42 DC 17 86 C3 98 E1 9E B4 E7 AF
> b.0u.B..........
> 00000210 A7 3D 2F A0 CA 48 F6 F8 33 E6 5C 14 02 97 90 2D
> .=/..H..3.\....-
>
>
>
>
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