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Image Reconstruction from Sinogram - iradon transform

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Alper Ozturk

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Nov 14, 2009, 7:58:02 PM11/14/09
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Hi,

I need to reconstruct this sinogram http://yfrog.com/58sinobp using matlab. I've tried using iradon, but nothing meaningful has come out. Could someone help me?

Thanks in advance,
Alper

Matt

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Nov 14, 2009, 9:15:19 PM11/14/09
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"Alper Ozturk" <alpero...@yahoo.com> wrote in message <hdnjmp$li0$1...@fred.mathworks.com>...

> Hi,
>
> I need to reconstruct this sinogram http://yfrog.com/58sinobp using matlab. I've tried using iradon, but nothing meaningful has come out. Could someone help me?
===================

You might try flipping the resulting image upside down. I get a picture of a clown when I do.

Alper Ozturk

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Nov 15, 2009, 5:24:01 AM11/15/09
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"Matt " <x...@whatever.com> wrote in message <hdno7n$pcm$1...@fred.mathworks.com>...

Thanks for the reply...
My try was:

I=imread('sino.bmp');
IR=iradon(I,360);

Since I am completely new to matlab, don't know what's wrong... Flipping does not work, also...

Matt

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Nov 15, 2009, 9:40:05 AM11/15/09
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"Alper Ozturk" <alpero...@yahoo.com> wrote in message <hdoks1$rbg$1...@fred.mathworks.com>...

> IR=iradon(I,360);

Read the help doumentaiton on iradon again.
The above is telling iradon() that there is a 360 degree angular increment between every projection view. What you really want is something like


AngularIncrement=180/size(I,2);
IR=iradon(I,AngularIncrement);

Alper Ozturk

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Nov 15, 2009, 3:35:02 PM11/15/09
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"Matt " <x...@whatever.com> wrote in message <hdp3s4$og4$1...@fred.mathworks.com>...

Oh great! Now I got it...
Thanks for the help...

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