Hi,
I tried using the fielemap toolbox for our Allegra Scanner. The gradient
fielmap sequence produces 2 series with 3 volumes.
2 Problems:
1. In the first volume we have the absolute values for the 2 echo times, but
the spm-dicom toolbox only produces the Analyze volume for the longer TE,
which I think is the one I need. Am I correct here.
Otherwise I have to apply some tricks as the header information is too
similar. I'd have to seperate the slices first.
2. The phase image is made up of unsigned intergers between 0 and 1950. From
that I would suspect that scaling would go up to 2048. I can convert the pics
to float but how is the mapping done?
a) 0..2048 -> -pi..pi
b) 0..2048 -> 0..2pi
or am I completely off?
Thanks for any help.
Roland
--
Dr. Roland Marcus Rutschmann <[log in to unmask]>
Institute for Experimental Psychology, University of Regensburg
Universitätsstraße 31, 93053 Regensburg, Germany
Tel: +49 941 943 2533, Fax: +49 941 943 3233
http://www.psychologie.uni-regensburg.de/Rutschmann
|