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Hi Zhenhao


yes this is correct - enter the time of slices as they were acquired :-)

>> hdr1 = spm_dicom_headers(xDicomFile{1});
>> hdr1{1}.Private_0019_1029'

ans =

         0
  180.0000
  360.0000
   60.0000
  240.0000
  420.0000
  120.0000
  300.0000
         0
  180.0000
  360.0000
   60.0000
  240.0000
  420.0000
  120.0000
  300.0000
         0
  180.0000
  360.0000
   60.0000
  240.0000
  420.0000
  120.0000
  300.0000
         0
  180.0000
  360.0000
   60.0000
  240.0000
  420.0000
  120.0000
  300.0000
         0
  180.0000
  360.0000
   60.0000
  240.0000
  420.0000
  120.0000
  300.0000
         0
  180.0000
  360.0000
   60.0000
  240.0000
  420.0000
  120.0000
  300.0000

I assume that these numbers should go to "Slice Timing - Slice order", and TR set to 0.5. My questions are:

(1) Should  "Slice Timing - TA" be 0.42?

would not that be 0.48? you can see your last slice is 0.42 so the end of that would be 0.48 right

(2) Can "Slice Timing - Reference Slice" be 180? (i.e. either one of the two middle numbers in Slice order)

if can be any, typically the middle in time (not space) so maybe 0.24

(3) Can "fMRI model specification - Microtime resolution" be 500? (as if there were 500 1-ms time-bins)

I'd rather choose the number of slices ie 42

(4) Can "fMRI model specification - Microtime onset" be 180? (reference slice was acquired at the 180th 1-ms time-bin)

yes define as the same as your reference in slice timing


-- The second study had TR = 2000 ms, and acquisition times below:

I'll you work out the other one ..

best
cyril