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Re: backprojection [message #52168 is a reply to message #52165]

Thu, 18 January 2007 17:53

Marc Reinig
Messages: 30
Registered: June 2004

Member

"David Fanning" <news@dfanning.com> wrote in message
news:MPG.2017ea6ce320271a989e7b@news.frii.com...
> TimLS writes:
>
>> I have some radar data which I want to process. I have range profiles
>> (back scattered power is recorded at different ranges) that have been
>> collected at 1 degree increments all the way round an object that I am
>> trying to image. This must be very similar to a lot of medical imaging
>> applications. I next want to use something like the inverse radon
>> transform to transform the r, theta data into an x-y type image of the
>> object. Is there anyone out there in the medical imaging world who has
>> some code or who can give me a clue as to what I need to do?
>
> Have you looked at the HOUGH and RADON functions and the
> examples in the documentation for back projection?
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Look up filtered backprojection and the Fourier slice theorem. Filtering
the back projected data compensates for the fact that the some of the data
is sampled more than others and needs to be de emphasized.

-Marco
____________________________________________________________ ____
Marc Reinig
Laboratory for Adaptive Optics
UCO/Lick Observatory

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[Message index]

		Re: backprojection By: Wox on Fri, 19 January 2007 01:52
		Re: backprojection By: Marc Reinig on Thu, 18 January 2007 17:53
		Re: backprojection By: Mike[2] on Thu, 18 January 2007 08:49
		Re: backprojection By: TimLS on Thu, 18 January 2007 00:40
		Re: backprojection By: Wox on Wed, 17 January 2007 08:32
		Re: backprojection By: David Fanning on Wed, 17 January 2007 07:11

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