DCMTK读取DICOM文件头信息的三种方法

最新推荐文章于 2025-01-07 18:11:56 发布

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本文介绍如何不读取数据集而加载DICOM文件的元信息头，包括使用DcmMetaInfo类、DcmFileFormat类的两种方法及结合读取元信息头和数据集的方法。

Howto: Load File Meta-Header

Here's an example that shows how to load the File Meta Information Header of a DICOMfile without reading the dataset. This could be useful if you are e.g. only interested in theSOP Class UID and Transfer Syntax UID of the file.

There are three different approaches:

Use the loadFile() method of the DcmMetaInfo class.
Use the loadFile() method of the DcmFileFormat class with read mode ERM_metaOnly.
Use the read() method of the DcmFileFormat class in order to successively load the meta-header and the dataset.

The third approach allows for reading the dataset only if certain criteria (based on the data elements in the meta-header) are met. Please note that in this case the same input stream is used and that the meta-header is only read once.

Source Code

#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmdata/dctk.h"
#include "dcmtk/dcmdata/dcistrmf.h"
 
int main(int argc, char *argv[])
{
    OFCondition status;
 
    /* approach 1 */
    DcmMetaInfo metainfo;
    status = metainfo.loadFile("test.dcm");
    if (status.good())
    {
        OFString sopClassUID, xferUID;
        if (metainfo.findAndGetOFString(DCM_MediaStorageSOPClassUID, sopClassUID).good())
            COUT << "SOP Class UID: " << sopClassUID << OFendl;
        if (metainfo.findAndGetOFString(DCM_TransferSyntaxUID, xferUID).good())
            COUT << "Transfer Syntax UID: " << xferUID << OFendl;
        metainfo.print(COUT);
    }
 
    /* approach 2 */
    DcmFileFormat fileformat;
    status = fileformat.loadFile("test.dcm", EXS_Unknown, EGL_noChange, DCM_MaxReadLength, ERM_metaOnly);
    if (status.good())
    {
        OFString sopClassUID, xferUID;
        if (fileformat.getMetaInfo()->findAndGetOFString(DCM_MediaStorageSOPClassUID, sopClassUID).good())
            COUT << "SOP Class UID: " << sopClassUID << OFendl;
        if (fileformat.getMetaInfo()->findAndGetOFString(DCM_TransferSyntaxUID, xferUID).good())
            COUT << "Transfer Syntax UID: " << xferUID << OFendl;
        fileformat.print(COUT);
    }
 
    /* approach 3 */
    fileformat.clear();
    DcmInputFileStream fileStream("test.dcm");
    status = fileStream.status();
    if (status.good())
    {
        /* first, read meta-header */
        fileformat.setReadMode(ERM_metaOnly);
        fileformat.transferInit();
        status = fileformat.read(fileStream);
        if (status.good())
        {
            OFString sopClassUID, xferUID;
            if (fileformat.getMetaInfo()->findAndGetOFString(DCM_MediaStorageSOPClassUID, sopClassUID).good())
                COUT << "SOP Class UID: " << sopClassUID << OFendl;
            if (fileformat.getMetaInfo()->findAndGetOFString(DCM_TransferSyntaxUID, xferUID).good())
                COUT << "Transfer Syntax UID: " << xferUID << OFendl;
            /* then read dataset if certain criteria are met */
            if (sopClassUID == UID_SecondaryCaptureImageStorage)
            {
                fileformat.setReadMode(ERM_autoDetect);
                status = fileformat.read(fileStream);
                if (status.good())
                {
                    fileformat.print(COUT);
                }
            }
        }
        fileformat.transferEnd();
    }
 
    return 0;
}