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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 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

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).

Talked with the colleagues. Currently the problem can not be reproduced (maybe another update fixed the problem). So "watchfull waiting". We will reopen/reprioritze it, if it occurs again.