I have a question regarding the slice timing.
I looked at the json file for my acquisition and it looks like this : [“SliceTiming”: [
0, 1, 0.05, 1.05, 0.1, 1.1, 0.15, 1.15, 0.2, 1.2, 0.25, 1.25, 0.3, 1.3, 0.35, … 0.95, 1.95]
And I need to use that information to run a connectivity analysis with the COnn Toolbox.
and I’m having trouble selecting which category of slice timing that is. I think it’s ascending but is that Interleaved?
Thank you very much in advance.
You may find my page on slice order helpful.
The NIfTI header specification is also relevant.
So Sequential Increasing (NIFTI_SLICE_SEQ_INC) timing will look like:
0, 0.05, 0.1 ...1.95
While interleaved increasing (ALT_INC; e.g. Siemens scanner with interleaved acquisition and an odd number of slices) would look like:
0, 1, 0.05, 1.05, 0.1 ... 1.95
or interleaved increasing (NIFTI_SLICE_ALT_INC2; e.g. Siemens scanner with interleaved acquisition and an even number of slices) would look like:
1, 0, 1.05, 0.05 ... 1.95
Just be aware that it is now popular to acquire resting state data using multi-band sequences (where multiple slices will share the same acquisition time) which use more complex patterns, so if there are more than one slices with a
SliceTiming of 0 you can not specify the data as merely being interleaved.
Thank you so much for your help!