For the section of the course on MRI Physics many of your course faculty recommend the following site, and here is a testimonial from one of your classmates:
"The website that I was speaking to you about that has been very helpful to me in understanding MRI basics is:

http://www.cis.rit.edu/htbooks/mri/

It's even helped me understand some of the hst.583 lectures better because it really delves into the very basics without including too much information in any given topic. I especially found the section on Fourier Transform helpful. -Dairon"

From Jorge Jovicich (former HST.583 lecturer):

About spatial smoothing: http://lbc.nimh.nih.gov/fidap/spatialsmooth.html
Tutorial on Smoothing: http://www.mrc-cbu.cam.ac.uk/Imaging/smoothing.html

Other MRI/FMRI educational links

Thresholding with Random Field Theory: http://www.mrc-cbu.cam.ac.uk/Imaging/randomfields.html
Full contents of listings in MRC-CBU: http://www.mrc-cbu.cam.ac.uk/Imaging/contents.html
http://www.spectroscopynow.com/Spy/basehtml/SpyH/1,2466,9-4-17950-0-17950-directories--0,00.html
http://defiant.ssc.uwo.ca/Jody_web/fmri4newbies.htm
With a very cool idea in: http://defiant.ssc.uwo.ca/Jody_web/fMRI4Dummies/how2liewithfMRIstats.htm
http://www.fmrib.ox.ac.uk/~stuart/thesis/
In particular:

From former Lecturer and HST student Dave Tuch come these recommended learning sites:

http://www.ismrm.org/mr_sites.htm#Education
http://www.mritutor.org/mritutor/
http://www.simplyphysics.com/IntroToMRI.html
http://www.mathworld.com