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PROGRAM:

NAME

gdcmraw - Extract Data Element Value Field.

SYNOPSIS

gdcmraw [options] file-in file-out

DESCRIPTION

The gdcmraw tool is mostly used for development purpose. It is used to extract a specific
binary field from a DICOM DataSet.

PARAMETERS

file-in DICOM input filename

file-out output filename

OPTIONS

-i --input Input filename
-o --output Output filename
-t --tag Specify tag to extract value from.

SPECIFIC OPTIONS

-S --split-frags Split fragments into multiple files.
-p --pattern Specify trailing file pattern (see split-frags).
-P --pixel-data Pixel Data trailing 0.

GENERAL OPTIONS

-h --help
print this help text and exit

-v --version
print version information and exit

-V --verbose
verbose mode (warning+error).

-W --warning
warning mode, print warning information

-E --error
error mode, print error information

-D --debug
debug mode, print debug information

TYPICAL USAGE

Copy Attribute Value to file
This will extract the value at Tag (0025,101b):

$ gdcmraw -i GE_MR_0025xx1bProtocolDataBlock.dcm -t 25,101b -o pdb.raw

Extract Pixel Data
If you do not specify any tag, the Pixel Data element is the default one. So for instance
to grab the Pixel Data from an image:

$ gdcmraw -i test.acr -o test.raw

You can then for example compute the md5sum of this pixel data (very useful):

$ md5sum test.raw
f845c8f283d39a0204c325654493ba53 test.raw

Encapsulated Syntax
When the Pixel Data is encapsulated, multiple fragments can be used to store a single
slice image:

$ gdcmdump D_CLUNIE_CT1_J2KR.dcm

\&...
(7fe0,0010) OB # u/l,1 Pixel Data
(fffe,e000) ?? [] # 0,1 Item
(fffe,e000) ?? ff\\4f\\ff\\51\\00\\29\\00\\00\\00\\00\\02\\00\\00\\00\\02\\00\\00\\00\\00\\00\\00\\00\\00\\00\\00\\00\\02\\00\\00\\00\\02\\00 # 65536,1 Item
(fffe,e000) ?? 2c\\b7\\ee\\68\\de\\e3\\93\\2d\\b3\\b8\\ba\\90\\7b\\42\\3e\\f8\\42\\16\\64\\88\\46\\30\\37\\d4\\50\\95\\9b\\b6\\a5\\c7\\38\\9b # 65536,1 Item
(fffe,e000) ?? 48\\3c\\03\\e8\\c4\\3f\\44\\e1\\8a\\5c\\73\\3b\\02\\0a\\ad\\a5\\8f\\e4\\0c\\81\\76\\a2\\d7\\1b\\7f\\b7\\cd\\bc\\30\\c6\\6a\\6a # 43308,1 Item
(fffe,e0dd) 0

In order to create a J2K image out of it, we need to extract each fragments and
concatenate them:

$ gdcmraw -i D_CLUNIE_CT1_J2KR.dcm -o D_CLUNIE_CT1_J2KR.j2k

This is a valid J2K file, using the Kakadu software package:

$ kdu_expand -i D_CLUNIE_CT1_J2KR.j2k -o D_CLUNIE_CT1_J2KR.tiff -record D_CLUNIE_CT1_J2KR.txt

$ cat D_CLUNIE_CT1_J2KR.txt

Sprofile=PROFILE2
Scap=no
Sextensions=0
Ssize={512,512}
Sorigin={0,0}
Stiles={512,512}
Stile_origin={0,0}
Scomponents=1
Ssigned=yes
Sprecision=16
Ssampling={1,1}
Sdims={512,512}
Cycc=no
Cmct=0
Clayers=1
Cuse_sop=no
Cuse_eph=no
Corder=LRCP
Calign_blk_last={no,no}
Clevels=5
Cads=0
Cdfs=0
Cdecomp=B(-:-:-)
Creversible=yes
Ckernels=W5X3
Catk=0
Cuse_precincts=no
Cblk={64,64}
Cmodes=0
Qguard=1
Qabs_ranges=18,19,19,20,19,19,20,19,19,20,19,19,20,19,19,20

>> New attributes for tile 0:

Extract fragments as single file
Sometimes each fragments is in fact a single slice, so we would not need to concatenate
them:

$ gdcmdump 00191113.dcm

\&...
(7fe0,0010) OB # u/l,1 Pixel Data
(fffe,e000) ?? 00\\00\\00\\00\\6b\\38\\01\\00\\10\\77\\02\\00\\37\\b6\\03\\00\\a7\\f4\\04\\00 # 20,1 Item
(fffe,e000) ?? ff\\d8\\ff\\c3\\00\\0b\\08\\02\\00\\02\\00\\01\\00\\11\\00\\ff\\c4\\00\\1b\\00\\01\\01\\01\\01\\01\\01\\01\\01\\00\\00\\00\\00 # 79970,1 Item
(fffe,e000) ?? ff\\d8\\ff\\c3\\00\\0b\\08\\02\\00\\02\\00\\01\\00\\11\\00\\ff\\c4\\00\\1b\\00\\01\\01\\01\\01\\01\\01\\01\\01\\00\\00\\00\\00 # 81564,1 Item
(fffe,e000) ?? ff\\d8\\ff\\c3\\00\\0b\\08\\02\\00\\02\\00\\01\\00\\11\\00\\ff\\c4\\00\\1b\\00\\01\\01\\01\\01\\01\\01\\01\\01\\00\\00\\00\\00 # 81694,1 Item
(fffe,e000) ?? ff\\d8\\ff\\c3\\00\\0b\\08\\02\\00\\02\\00\\01\\00\\11\\00\\ff\\c4\\00\\1b\\00\\01\\01\\01\\01\\01\\01\\01\\01\\00\\00\\00\\00 # 81511 (81512),1 Item
(fffe,e0dd) 0

Let's try to extract those 4 individual Lossless jpeg individually:

$ gdcmraw --split-frags -i 00191113.dcm -o jpeg --pattern %02d.ljpeg

This will output 4 files:

-rw-r--r-- 1 mathieu mathieu 81512 2008-08-08 22:10 jpeg03.ljpeg
-rw-r--r-- 1 mathieu mathieu 81694 2008-08-08 22:10 jpeg02.ljpeg
-rw-r--r-- 1 mathieu mathieu 81564 2008-08-08 22:10 jpeg01.ljpeg
-rw-r--r-- 1 mathieu mathieu 79970 2008-08-08 22:10 jpeg00.ljpeg

FOOTNOTE ABOUT JPEG FILES

It is a common misunderstanding to interchange 'JPEG 8bits lossy' with simply JPEG file.
The JPEG specification is much broader than simply the common lossy 8bits file (as found
on internet).

You can have:

· JPEG Lossy 8bits

· JPEG Lossy 12bits

· JPEG Lossless 2-16bits

Those are what is defined in ITU-T T.81, ISO/IEC IS 10918-1.

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