Hi,
I can press the calculate button after entering just one phase image and two
magnitude images, but I get the following error message:
??? Error using ==> pm_make_fieldmap at 127
Requires 2 or 4 images
Error in ==> FieldMap at 1621
IP.fm = pm_make_fieldmap([IP.P{1} IP.P{2} IP.P{3} IP.P{4}],IP.uflags);
Error in ==> FieldMap at 697
status=FieldMap('CreateFieldMap',IP);
It works using one phase and one magnitude image, I am however not sure if it
matters which magnitude image (long or short TE) I pick. (I am by the way using
the field map toolbox that comes with SPM5).
Cheers,
Oliver
________________________________________
Dipl. Psych. Dr. phil. Oliver Baumann
<[log in to unmask]>
Dep. of Experimental Psychology, Univ. Regensburg
>>> Marko Wilke 07/30/10 4:42 PM >>>
Hi Oliver,
> I want to create a vdm using the SPM fieldmap toolbox; however our TRIO does
provides me not with 2 or 4 GRE images (as decribed in the manual of the
toolbox) but with 3. I get 2 magnitude (according to the header long and short
TE) and 1 phase image (according to the header long TE). How can I use the
fieldmap toolbox with 3 images? Should I just use the two long TE images?
the Siemens software alows to write a phase difference map instead of
two phase maps. The fieldmap is aware of this and you can enter a short
and long echo magnitude image and one or two phase images - you will
note that, when adding one phase image to the two magnitude images, you
can already go ahead and press "calculate". In other words, if you only
enter one, the fieldmap toolbox expects it to be the phase difference
map. An alternative is to change the setting in the sequence on the
scanner as the output can be adapted.
Hope this helps,
Marko
--
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Marko Wilke (Dr.med./M.D.)
[log in to unmask]
Universitäts-Kinderklinik University Children's Hospital
Abt. III (Neuropädiatrie) Dept. III (Pediatric neurology)
Hoppe-Seyler-Str. 1, D - 72076 Tübingen
Tel.: (+49) 07071 29-83416 Fax: (+49) 07071 29-5473
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