Here is a mail from the archives posted by Stefan Thesen from Siemens:
It should answer your question. As far as I remember the interleaved
mode works so that the top slice is acquired in the first cycle e.g.
for 10 slices the order is : [2:2:10 1:2:9] whereas for 11 slices it
would be [1:2:11 2:2:10], but please confirm this in the header by
Hope this helps
Torben Ellegaard Lund
Assistant Professor, PhD
The Danish National Research Foundation's Center for Functionally
Integrative Neuroscience (CFIN)
Aarhus University Hospital
8000 Aarhus C
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On 10/12/2007, at 11.40, Volkmar Glauche wrote:
> Dear Qilin Lu,
> I am afraid, one can not determine slice order by looking at the data.
> Also, (at least for SIEMENS mosaic data I know of) there is no easy
> in telling the truth about ascending/descending and interleaved
> acquisition order from the DICOM header. You have to write that down
> yourself from the MR scanning protocol.
> On Mon, 2007-12-10 at 13:34 +0800, Nicolas Lue wrote:
>> Dear SPMer:
>> I want to use "slice timing" for correcting the acquisition time
>> between slices.
>> But i do not know the exact slice order, what i have is the 3d-
>> dicom file. i converted it to jpg file in this attachment. Can i
>> identify it is an ascending order (first slice=bottom) from that?
>> Thank you very much!
>> Qilin Lu
>> Institute of Neuroinformatics
>> Department of Physics
>> Dalian University of Technology
>> 2 Ling Gong Rd, Dalian 116023, China
> Volkmar Glauche
> Freiburg Brain Imaging
> Phone +49(0)761 270-5331
> Fax +49(0)761 270-5416