First is the manual: http://www.fil.ion.ucl.ac.uk/spm/doc/manual.pdf
Also this article: http://www.fil.ion.ucl.ac.uk/spm/doc/intro/
These should also be helpful: http://www.fil.ion.ucl.ac.uk/spm/doc/mfd/2011/

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From: SPM (Statistical Parametric Mapping) [[log in to unmask]] on behalf of Sarfaraz Hussein [[log in to unmask]]
Sent: Tuesday, November 13, 2012 11:13 AM
To: [log in to unmask]
Subject: [SPM] New PhD student needs guidance

Hi!

This is Sarfaraz Hussein. I’m first year PhD student at UCF. I have been exploring the area of medical imaging specifically fMRI for research. I came across SPM. I downloaded it and tried to run it as well. I require some basic level guidance regarding medical imaging and SPM. Can anybody guide me and help me out in this regard, by referring to basic and intuitive material as well as guiding me in selecting the area for medical research. I will be really thankful.

Thanking you in anticipation,
Sarfaraz Hussein