Can't import back the PET images to PET-CT

  • Hello all,

    After adding the Conquest as the Dicom Server in our PET-CT machine I can't import the PET dicoms back. There is no problem with CT though. Sending CT and PET to Conquest works (both modality dicoms are on the Conquest), importing the CT works too, but during the PET there is the unknown error on the PET-CT (it doesn't even start).

    What the log shows:

    The rest of the log is in the attachment (it's from the starting the Conquest, sending CT and PET to the Conquest, and then importing the dicoms back).

    If you have any ideas what can be wrong, I'd be grateful. I tested it on the 1.5 beta version and on the previous version too. Always the same problem.

    Best regards.

  • taffer

    Changed the title of the thread from “Can't import back the PET images do PET-CT” to “Can't import back the PET images to PET-CT”.
  • You mean our PET-CT logs? Unfortunately I'll have to wait for someone from the hardware support to take a look in to it as only the service has the access. I'll try in a few days.

  • I imported the files to GE SPECT-CT machine and took a look at the dicom tags. There is a group of private tags, starting from 0067 which are filled with radnom numbers and letters, could it be that this PET-CT exclusively needs these tags to accept them? I somehow found these logs and there are many warnings about this group:

    I took a look at dicom tags directly from PET-CT, not from Conquest, and they're like in the attached image.[Blocked Image:]

  • Hi,

    is enableJpegSupport on in your server? If ON, the server will propose explicit coding which is more robust. The private tags may be miscoded because they are not in the dictionary. On the other hand the group 28 tags it complains about are in the dictionary.

    What you can do:

    enable jpeg support

    send PET image to conquest

    sent it back to PET

    See if this works.


    Marcel van Herk is developer of the Conquest DICOM server together with Lambert Zijp.

  • It worked :)

    Do you think I can safely use this option? Won't it change or miss any important information for for example calculating the SUV? Anyway, I think I can check it easily.

    Thank you very much !!!

  • No,

    conquest does not throw anything away.

    In implicit mode dicom tag type is NOT transmitted

    In explicit mode dicom tag type is transmitted

    so explicit is safer for private data. Jpeg compression will be accepted when this mode is on, but only if the scanner requests it.


    Marcel van Herk is developer of the Conquest DICOM server together with Lambert Zijp.