[Castor-users] Problems with –im (involuntary patient motion correction)

[Schagt, I.H. van der]

Dear all,


I am having trouble with motion correction reconstruction when using the –im option. When I try to apply motion correction reconstruction I get the error:

Error, the 2th motion trigger timestamp: xxx occurs after the end of the last frame (frame 1, timestop: 0!
This error occurs in the code in the file oDynamicDataManager line 413 and arises incorrectly. When I do –im reconstruction in combination with 1 frame (so no framing), the time stop value of the frame remains 0s, it is not read from the data file. As a result, the time steps of the motion triggers are greater than the time stop value of the frame (line 407) and you will eventually get an error. When I manually adjust this time stop value to the correct value myself, this error message goes away, but I get incorrect reconstructed images. I only get black images after reconstruction where each voxel has NaN as its value. When I apply the same motion correction where I also divide the data into, for example, 2 frames (-frm…), I get correctly reconstructed images.


Does anyone of you know why the option –im gives these weird results, or what I maybe do wrong?
I use list-mode PET data with a total duration of 900 seconds. For the motion correction, I used three motion triggers (and deformations).


Thanks in advance!

Inge

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