OSEM vs Filtered Backprojection...

The OSEM package is extremely fast and provides the following benefits: mapped (nonuniform) attenuation correction, depth dependant point spread and produces less noisy, streak free images compared to FBP.

Please remember that OSEM is just a much faster version of EM which is sometimes referred to as MLEM. Below I point you to a collection of information on OSEM and its (slower) equivalents.

Image Comparisons

Starting with a collection of image comparisons of OSEM and FBP (Filtered Backprojection).
All of which show that OSEM produces better images (of course).

Example Summary (Individual images 1 2 3 4 5 6 7 )

Other sites that mention OSEM and/or compare it with Filtered Backprojection...

Please note: the internet changes faster than I can keep up with it.
If these links do not work for you try searching Google (as I did) for "OSEM FBP comparison".

Click here to Google
Here you can search Google for last 3 months.

Search Locations other than Google...

National Center for Biotechnology Information
Here you can search for "OSEM FBP" and find more than 30 references.

www.citeseer.com
Here you can search and find more than 40 papers that have cited the original OSEM paper.

One Japanese site found...

http://web.kanazawa-u.ac.jp/~med23/lecture/SPET-OSEM.html