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This is the command gdcminfo that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


gdcminfo - Display meta info about the input DICOM file.

SYNOPSIS


gdcminfo [options] [file-in/dir-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(s) processed.

PARAMETERS


file-in/dir-in DICOM input filename/dirname

OPTIONS


specific options
-r --recursive recursive traversal of an input directory
-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 some environment one wish to check whether or not the DICOM file is lossless. It is
fairly easy to do that in most cases. Only on two occasions this is not clear from the
sole DICOM Attributes. 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"

Pay attention that this tool also checks the Image Lossy Compression attribute
(0028,2110). This means --check-compression will also returns a value of lossy if a
predecessor was found to be lossy compressed.

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