[Dcmlib] force loading elements (follows)

[Jean-Pierre Roux]

Mathieu Malaterre wrote:

> Jean-Pierre Roux wrote:
>
>> Hi!
>>
>> According to some users requirement, we can now force the loading of 
>> some elements whose length exceeds the current 
>> MAX_SIZE_LOAD_ELEMENT_VALUE.
>>
>>
[...]

Mathieu :
Just for information.
The document
http://www.enac.northwestern.edu/~tew/archives/2003/02/25/incomplete-dicom-headers/ 

seems to contain unacurate information about the description of the 
/famous/ 0029, 1010 Siemens tag :
It's *not* an ASCII field (as told in the document), but a mix of ASCII 
and 'binary' information.

hexedit on the formerly called MR_0007_0001.dcm file (now : 
gdcmSampleData/were_in_gdcmData/MR_forceLoad29-1010_29-1020.dcm)
shows me :

000007C8   *29 00 10 10*  84 1A 00 00  53 56 31 30  ).......SV10
000007D4   04 03 02 01  38 00 00 00  4D 00 00 00  ....8...M...
000007E0   45 63 68 6F  4C 69 6E 65  50 6F 73 69  EchoLinePosi
000007EC   74 69 6F 6E  00 00 00 00  02 00 00 00  tion........
000007F8   02 00 00 00  02 00 00 00  02 00 00 00  ............
00000804   02 00 00 00  03 00 00 00  02 00 00 00  ............
00000810   02 00 00 00  02 00 00 00  02 00 00 00  ............
0000081C   02 00 00 00  01 00 00 00  49 53 00 00  ........IS..
00000828   06 00 00 00  06 00 00 00  4D 00 00 00  ........M...
00000834   09 00 00 00  09 00 00 00  4D 00 00 00  ........M...
00000840   09 00 00 00  36 34 20 20  20 20 20 20  ....64
0000084C   00 00 00 00  00 00 00 00  00 00 00 00  ............
00000858   CD 00 00 00  00 00 00 00  00 00 00 00  ............
00000864   00 00 00 00  CD 00 00 00  00 00 00 00  ............
00000870   00 00 00 00  00 00 00 00  CD 00 00 00  ............
0000087C   00 00 00 00  00 00 00 00  00 00 00 00  ............
00000888   CD 00 00 00  00 00 00 00  00 00 00 00  ............
00000894   00 00 00 00  CD 00 00 00  00 00 00 00  ............
000008A0   45 63 68 6F  43 6F 6C 75  6D 6E 50 6F  EchoColumnPo
000008AC   73 69 74 69  6F 6E 00 07  90 EA DA 07  sition......
000008B8   C0 EA DA 07  D0 EA DA 07  E0 EA DA 07  ............
000008C4   B0 EA DA 07  D0 FA DA 07  F0 EA DA 07  ............
000008D0   D0 E9 DA 07  00 EB DA 07  80 FA DA 07  ............
000008DC   80 EA DA 07  01 00 00 00  49 53 00 00  ........IS..
000008E8   06 00 00 00  06 00 00 00  4D 00 00 00  ........M...
000008F4   09 00 00 00  09 00 00 00  4D 00 00 00  ........M...
00000900   09 00 00 00  36 34 20 20  20 20 20 20  ....64
0000090C   00 00 00 00  00 00 00 00  00 00 00 00  ............
00000918   CD 00 00 00  00 00 00 00  00 00 00 00  ............
00000924   00 00 00 00  CD 00 00 00  00 00 00 00  ............
00000930   00 00 00 00  00 00 00 00  CD 00 00 00  ............
0000093C   00 00 00 00  00 00 00 00  00 00 00 00  ............
00000948   CD 00 00 00  00 00 00 00  00 00 00 00  ............
00000954   00 00 00 00  CD 00 00 00  00 00 00 00  ............
---  MR_forceLoad29-1010_29-1020.dcm       --0x954/0x16C94----



>
>
> Really neat !
>
>     Just for background information, gdcm has a default behavior of 
> skeeping reading the long binary stream. So far this was ok because 
> user are only interested in the DICOM image. But the /famous/ 0029, 
> 1010 Siemens tag is actually needed when you start doing any thing 
> fancy. Indeed the so called /Siemens addendum/ contain lot of 
> information that allow proper reconstruction of the DICOM volume.
>
> Mathieu
> For more info, on this private tag:
>
> original report:
> <...>
> Thanks for your help. I will give your suggestion a try.This field as
> actually an ASCII parameter map for the Siemens pulse sequence used to
> create the images. It provides all information allowing you to take an
> image from one Siemens scanner to another scanner and completely specify
> the imaging parameters. An example of some of the fields are shown at
> this site:
>
> http://www.enac.northwestern.edu/~tew/archives/2003/02/25/incomplete-dicom-headers/ 
>
>
>
> Since information about the DTI study such as number of directions and
> number of b values applied are stored in this header, it will allow me
> to convert the 3D data to a 4D representation that we use to analyze the
> data.
> <...>
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