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From: malcolm@Apple.COM (Malcolm Slaney)
Newsgroups: comp.archives
Subject: [sci.med.physics] Re: backprojection code
Keywords: tomography,backprojection
Message-ID: <1990Dec6.050334.1357@ox.com>
Date: 6 Dec 90 05:03:34 GMT
References: <1990Dec4.074044.2886@rti.rti.org> <47111@apple.Apple.COM>
Sender: emv@ox.com (Edward Vielmetti)
Reply-To: malcolm@Apple.COM (Malcolm Slaney)
Followup-To: sci.med.physics
Organization: Apple Computer Inc., Cupertino, CA
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Approved: emv@ox.com (Edward Vielmetti)
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Archive-name: med/tomography/crc-tomography/1990-12-05
Archive: apple.com:/pub/malcolm/ct.tar [130.43.2.2]
Original-posting-by: malcolm@Apple.COM (Malcolm Slaney)
Original-subject: Re: backprojection code
Reposted-by: emv@ox.com (Edward Vielmetti)

In article <1990Dec4.074044.2886@rti.rti.org> dbn@rti.rti.org 
	(Daniel B. Nissman) writes:
>Does anyone have available some code (in C, preferably) which implements the
>convolution backprojection algorithm (most important)? 

The source code for the CRC Tomography package is available for anonymous
FTP from apple.com.  This is a bunch of Unix programs originally written
by Carl Crawford and then polished and documented as part of our PhD work.

The package generates projection data and performs reconstructions using
either parallel or fan beam geometries.  The code is pretty simple and 
fairly clean.  It also has a bunch of concessions to the real world (like it
can find the center of projections if your scan axis isn't centered.)

There are manual pages included.  Most of the conventional tomographic images
in our book
	"Principles of Computerized Tomographic Imaging" by Kak and Slaney,
	IEEE Press, 1988.
were generated with this software.

Grab the software from /pub/malcolm/ct.tar using anonymous FTP into the
host apple.com.  Drop me a note if you have any questions.  I haven't done
any tomography in five years now but I should be able to help (or try to 
pass the buck.)

Cheers.

								Malcolm


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