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Incorrect loading of DICOM images generated by SIEMENS MR-PET
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Description

Status: Since the newest software update, dynamic images acquired by the DKFZ MR-PET device, cannot be loaded correctly. Multiple frames of a 3D+t data set have the same time point. It seems like our used tags (acquisition time/date, trigger time) contain not enough information to correctly reconstruct the time geometry of the images generated by the device.

Event Timeline

floca created this task.Jul 18 2018, 12:58 PM
floca moved this task from Restricted Project Column to Restricted Project Column on the Restricted Project board.Sep 13 2018, 9:30 PM
kislinsk triaged this task as Normal priority.Nov 22 2018, 11:53 AM
kalali added a subscriber: kalali.Mon, Feb 18, 3:18 PM

I found some PET data in XNAT (FS-E Demodata)

Dataset: 3274483764_20171122_PT

When loading both images simultaneously:

Imagereal timepointsMITK 2018.4.0Timesteps in 2018MITK 2016.11.0Timesteps in 2016
40012-_Multigate_4Phasen_PRR_AC_Images430.00 ms, 648.00 ms, 1222.00 ms, 2444.00 ms, 3328 ms40 ms, 1 ms, 2 ms, 3 ms
40014-_Multigate_4Ampl_PRR_AC_Images430.00 ms, 648.00 ms, 1222.00 ms, 2444.00 ms, 3328 ms40 ms, 1 ms, 2 ms, 3 ms
NOTE: MITK 2016.11.0: All 4 timesteps show a different image
NOTE: MITK 2018.4.0: 4Phasen only timesteps 0, 2, 3 show a different image; 4Ampl only timesteps 0, 1, 3 show a different image

Timebounds information is as follows:

40012-_Multigate_4Phasen_PRR_AC_Images

min TimeBounds: 
        Step 0: 0 ms
        Step 1: 1222 ms
        Step 2: 2444 ms
        Step 3: 3337 ms

max TimeBounds: 
        Step 0: 1222 ms
        Step 1: 2444 ms
        Step 2: 3337 ms
        Step 3: 3337 ms
40014-_Multigate_4Ampl_PRR_AC_Images:

min TimeBounds: 
        Step 0: 0 ms
        Step 1: 648 ms
        Step 2: 2444 ms
        Step 3: 3328 ms

max TimeBounds: 
        Step 0: 648 ms
        Step 1: 2444 ms
        Step 2: 3328 ms
        Step 3: 3328 ms

When loading each image separately:

Imagereal timepointsMITK 2018.4.0Time in 2018MITK 2016.11.0Time in 2016
40012-_Multigate_4Phasen_PRR_AC_Images430.00 ms, 1222.00 ms, 2440.00 ms, NA40 ms, 1 ms, 2 ms, 3 ms
40014-_Multigate_4Ampl_PRR_AC_Images430.00 ms, 648.00 ms, 2444.00 ms, NA40 ms, 1 ms, 2 ms, 3 ms

Last timestep in each image can not be accessed (comp. T24766).