]> MathieuMalaterreMain developer 20062011Mathieu Malaterre gdcminfo 1 GDCM &version; DICOM Manipulation. gdcminfo Display meta info about the input DICOM file. gdcminfo options file-in/dir-in 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. file-in/dir-in DICOM input filename/dirname -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). --force-rescale force rescale. --force-spacing force spacing. --mosaic dump image information of MOSAIC. -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 GDCM_RESOURCES_PATH path pointing to resources files (Part3.xml, ...) 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 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 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 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. Dump the image as if MOSAIC. If the input is really MOSAIC image, then print the information of the true underlying MOSAIC volume. $ gdcminfo --mosaic siemens_mosaic.dcm gdcmdump(1), gdcmraw(1), gdcmconv(1)