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January 23, 2019 10:44PM
Dear afni experts,

I'm doing slice timing correction for data from GE MR750 machine.

Up to now, i get the interleaved scan order from engineer, and find some interesting tags from DICOM header:
First scan Direction: Superior
First scan Location:75.135
Last scan Direction: Inferior
Last scan Location: -91.658

And I've checked that these two slice are the highest and lowest slice for 1 TR.

For the tpattern option from 3dTshift:
S L I C E   N U M B E R
   tpattern    0   1   2   3   4   Comment
   --------- --- --- --- --- ---   -------------------------------
   altplus     0 600 200 800 400   Alternating in the +z direction
   alt+z2    400   0 600 200 800   Alternating, but starting at #1
   altminus  400 800 200 600   0   Alternating in the -z direction
   alt-z2    800 200 600   0 400   Alternating, starting at #nz-2
   seqplus     0 200 400 600 800   Sequential  in the +z direction
   seqminus  800 600 400 200   0   Sequential  in the -z direction

I think i should choose between alt+z and alt-z, but I am quite confused with which one to choose with the information above, what's the relationship between +z/-z and the information above? I can't figure out where's the corresponding Slice Number in my DICOM header, would you mind giving me some advice?

Best wishes,
Peng



Edited 1 time(s). Last edit at 01/23/2019 10:52PM by Peng Ren.
Subject Author Posted

Confusion about Slicing timing correction

Peng Ren January 23, 2019 10:44PM

Re: Confusion about Slicing timing correction

rick reynolds January 24, 2019 08:59AM

Re: Confusion about Slicing timing correction

Peng Ren January 24, 2019 09:05PM

Re: Confusion about Slicing timing correction

rick reynolds January 24, 2019 10:08PM

Re: Confusion about Slicing timing correction

Peng Ren January 24, 2019 11:20PM

Re: Confusion about Slicing timing correction

rick reynolds January 25, 2019 08:54AM

Re: Confusion about Slicing timing correction

Peng Ren January 25, 2019 09:03PM



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