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<head><title>Parallel Computer Processing</title></head>

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<H3>Parallel Computer Processing</H3>

Since each view can be processed independently, filtered backprojection is amendable to
parallel processing. Indeed, this has been used in commercial scanners to speed reconstruction.
This parallelism is exploited both in the <TT>CTSim</TT> graphical shell and
in the <A HREF="ctsim94.html#ctsimtextlam">LAM</A> version of <TT>CTSimText</TT>. <TT>CTSim</TT> can distribute it's workload
amongst multiple processors working in parallel.<P>
The graphical shell will automatically take advantage of multiple CPU's when
running on a <EM>Symmetric Multiprocessing</EM>
computer. Dual-CPU computers are commonly available which provide a near doubling
in reconstruction speeds. <TT>CTSim</TT>, though, has no limits on the number of CPU's
that can be used in parallel. The <EM>LAM</EM> version
of <TT>CTSimText</TT> is designed to work in a cluster of computers.
This has been testing with a cluster of 16 computers in a
<A HREF="http://www.beowulf.org">Beowulf-class</A> cluster with excellent
results.<P>

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