[vtkusers] vtkDICOMImageReader question

Fri May 7 10:04:02 EDT 2004

hi.

i recently started working with VTK and have been using the relatively
new DICOM IO / Utilities.

we've used DICOM files for the past few years in some of our non-VTK
research applications.

aside from the mysterious 'Magic Number' most of our existing data has
read in correctly via vtkDICOMImageReader.  however, there are some datasets
that consistently generate a zero Z dimension:
  DataExtent: (0, 511, 0, 511, 0, 0)

i've examined the vtk source, and have added certain fields to some of the
offending dicom files, but have not yet discovered the cause of this problem.
i noticed that the DICOMOrderingElements class is used in many of the
image sorting templates.  but i seem to have those fields covered.

for anyone out there who is intimately familiar with this loader, i'm including
the header info of one file of a series that never returns a non-zero Z
extent.  the 'Image Position Patient' and 'Slice Location', etc. progress
in Positive Z throughout this series.
i'm hoping someone may find an obvious required field for the vtk loader
that is missing or anonymized in this header dump.

thanks in advance.

--fred

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DCM Dump Elements
Object type: ELEMENT LIST
Object size: 525458
Group: 0008, Length:      380
0008 0008       22 //                  ID Image Type//ORIGINAL\PRIMARY\AXIAL
0008 0012        8 //      ID Instance Creation Date//20040503
0008 0013        6 //      ID Instance Creation Time//132513
0008 0014        8 //        ID Instance Creator UID//0.0.0.0
0008 0016       26 //               ID SOP Class UID//1.2.840.10008.5.1.4.1.1.7
0008 0018       34 //            ID SOP Instance UID//0.0.0.0.1.0.0.0.973732320.76005.0
0008 0020       20 //                  ID Study Date//CONFIDENTIAL_DELETED
0008 0021       20 //                 ID Series Date//CONFIDENTIAL_DELETED
0008 0022       20 //            ID Acquisition Date//CONFIDENTIAL_DELETED
0008 0030        0 //                  ID Study Time//
0008 0050        0 //            ID Accession Number//
0008 0060        2 //                    ID Modality//OT
0008 0064        4 //             ID Conversion Type//WSD 
0008 0070        0 //                ID Manufacturer//
0008 0090       20 //  ID Referring Physician's Name//CONFIDENTIAL_DELETED
0008 0201        6 //                               //Unimplemented
0008 1060       20 //ID Name of Physician(s) Reading Study//CONFIDENTIAL_DELETED
0008 1070       20 //             ID Operator's Name//CONFIDENTIAL_DELETED
Group: 0010, Length:      280
0010 0010       20 //               PAT Patient Name//CONFIDENTIAL_DELETED
0010 0020       20 //                 PAT Patient ID//CONFIDENTIAL_DELETED
0010 0021       20 //       PAT Issuer of Patient ID//CONFIDENTIAL_DELETED
0010 0030       20 //          PAT Patient Birthdate//CONFIDENTIAL_DELETED
0010 0040       20 //                PAT Patient Sex//CONFIDENTIAL_DELETED
0010 1005       20 //      PAT Patient's Birth Name //CONFIDENTIAL_DELETED
0010 1010       20 //                PAT Patient Age//CONFIDENTIAL_DELETED
0010 1030       20 //             PAT Patient Weight//CONFIDENTIAL_DELETED
0010 1060       20 //PAT Patient's Mother's Birth Name//CONFIDENTIAL_DELETED
0010 21b0       20 // PAT Additional Patient History//CONFIDENTIAL_DELETED
Group: 0018, Length:       12
0018 0050        4 //            ACQ Slice Thickness//3.75
Group: 0020, Length:      354
0020 000d       30 //         REL Study Instance UID//0.0.0.0.2.0.973732320.76005.0
0020 000e       32 //        REL Series Instance UID//0.0.0.0.3.0.0.973732320.76005.0
0020 0010        6 //                   REL Study ID//66666 
0020 0011        2 //              REL Series Number//4 
0020 0013        2 //               REL Image Number//2 
0020 0020        0 //        REL Patient Orientation//
0020 0032       28 //     REL Image Position Patient//-125.000\-125.000\-16.250000
0020 0037       54 //REL Image Orientation (Patient)//1.000000\0.000000\0.000000\0.000000\1.000000\0.000000 
0020 1041       10 //             REL Slice Location//-16.250000
0020 4000      110 //             REL Image Comments//THE OUTPUT OF THIS SOFTWARE IS FOR INVESTIGATIONAL USE ONLY - NOT TESTED OR APPROVED FOR CLINICAL APPLICATION 
Group: 0028, Length:      136
0028 0002        2 //          IMG Samples Per Pixel//   1 1
0028 0004       12 // IMG Photometric Interpretation//MONOCHROME2 
0028 0006        2 //       IMG Planar Configuration//   0 0
0028 0008        2 //           IMG Number of Frames//1 
0028 0010        2 //                       IMG Rows// 200 512
0028 0011        2 //                    IMG Columns// 200 512
0028 0030       18 //              IMG Pixel Spacing//0.601562\0.601562 
0028 0100        2 //             IMG Bits Allocated//  10 16
0028 0101        2 //                IMG Bits Stored//  10 16
0028 0102        2 //                   IMG High Bit//   f 15
0028 0103        2 //       IMG Pixel Representation//   0 0
Group: 7fe0, Length:   524296
7fe0 0010   524288 //                 PXL Pixel Data//Data on disk
DCM Dump Elements Complete

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