NAME
gdcminfo - .TH "gdcminfo" 1 "Sun Aug 8 2010" "Version 2.0.15" "GDCM"
NAME
gdcminfo - .SH "SYNOPSIS"
gdcminfo [options] file-in
DESCRIPTION
The gdcminfo command line program takes as input a DICOM file, or a
directory and process it to extract meta- information about the DICOM
file processed.
PARAMETERS
file-in DICOM input filename
OPTIONS
OPTIONS
-r --recursive recursive.
-d --check-deflated check if file is proper deflated syntax.
--resources-path Resources path.
--md5sum Compute md5sum of Pixel Data attribute value.
--check-compression check the encapsulated stream compression (lossless/lossy).
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
environment variable
GDCM_RESOURCES_PATH path pointing to resources files (Part3.xml, ...)
Simple usage
gdcmData
Using data from gdcmData:
$ gdcminfo gdcmData/012345.002.050.dcm
MediaStorage is 1.2.840.10008.5.1.4.1.1.4 [MR Image Storage]
NumberOfDimensions: 2
Dimensions: (256,256)
Origin: (-85,21.6,108.7)
Spacing: (0.664062,0.664062,1.5)
DirectionCosines: (1,0,0,0,0,-1)
Rescale Intercept/Slope: (0,1)
SamplesPerPixel :1
BitsAllocated :16
BitsStored :16
HighBit :15
PixelRepresentation:1
Orientation Label: CORONAL
Davie Clunie datasets:
Using data from David Clunie datasets:
$ gdcminfo BRTUM001.dcm
MediaStorage is 1.2.840.10008.5.1.4.1.1.4.1 [Enhanced MR Image Storage]
NumberOfDimensions: 3
Dimensions: (256,256,15)
Origin: (40,-105,105)
Spacing: (0.820312,0.820312,6)
DirectionCosines: (0,1,0,0,0,-1)
Rescale Intercept/Slope: (0,1)
SamplesPerPixel :1
BitsAllocated :16
BitsStored :16
HighBit :15
PixelRepresentation:1
Orientation Label: SAGITTAL
Checking the md5sum of the Pixel Data
After compressing a DICOM file (see gdcmconv) using a lossless
compression algorithm, it is fairly easy to compare the two files for
differences at DICOM attribute level. However one operation is slightly
easier to do: how to make sure the compression was actually lossless ?
In this case one could use the --md5sum operation.
Take an uncompressed DICOM image file:
$ gdcminfo --md5sum SIEMENS_ImageLocationUN.dcm
The tool return: 0621954acd5815e0b4f7b65fcc6506b1
Now compress this file:
$ gdcmconv --jpegls SIEMENS_ImageLocationUN.dcm lossless_compressed.dcm
and then check again the md5sum:
$ gdcminfo --md5sum lossless_compressed.dcm
The tool return: 0621954acd5815e0b4f7b65fcc6506b1
Checking if Pixel Data is lossless
In come environment one wish to check whether or not the DICOM file is
lossless or not. It is fairly easy to do that in most cases. Only in
two occasion this is not clear from the sole DICOM Attribute. When the
Transfer Syntax is JPEG 2000 Image Compression (1.2.840.10008.1.2.4.91)
and when the Transfer Syntax is JPEG-LS Lossy (Near-Lossless) Image
Compression (1.2.840.10008.1.2.4.81).
In this case, the only solution is to open the Pixel Data element, read
the specific JPEG header and check whether or not the JPEG
transformation was lossless or not:
$ gdcminfo --check-compression gdcmData/MAROTECH_CT_JP2Lossy.dcm
The tool returns: 'Encapsulated Stream was found to be: lossy'
SEE ALSO
gdcmdump(1), gdcmraw(1), gdcmconv(1)
COPYRIGHT
Copyright (c) 2006-2010 Mathieu Malaterre