Hi,<br> I have a problem. how to read the .mha file? Can i use the matlab?<br>Debin<br><br><div class="gmail_quote">2013/2/28 <span dir="ltr"><<a href="mailto:rtk-users-request@openrtk.org" target="_blank">rtk-users-request@openrtk.org</a>></span><br>
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Today's Topics:<br>
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1. Re: trouble projecting phantom (M Miller)<br>
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Message: 1<br>
Date: Tue, 26 Feb 2013 21:45:48 -0800 (PST)<br>
From: M Miller <<a href="mailto:croow@yahoo.com">croow@yahoo.com</a>><br>
Subject: Re: [Rtk-users] trouble projecting phantom<br>
To: Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr">simon.rit@creatis.insa-lyon.fr</a>><br>
Cc: <a href="mailto:rtk-users@openrtk.org">rtk-users@openrtk.org</a><br>
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Scaling the phantom worked perfectly.<br>
You mentioned that a reconstruction will need to specify the source outside of the volume. How can I specify that? What parameters would you pass to rtkfdk.exe to reconstruct the phantom?<br>
?<br>
Thanks<br>
Micah<br>
<br>
--- On Tue, 2/26/13, Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr">simon.rit@creatis.insa-lyon.fr</a>> wrote:<br>
<br>
<br>
From: Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr">simon.rit@creatis.insa-lyon.fr</a>><br>
Subject: Re: [Rtk-users] trouble projecting phantom<br>
To: "M Miller" <<a href="mailto:croow@yahoo.com">croow@yahoo.com</a>><br>
Cc: <a href="mailto:rtk-users@openrtk.org">rtk-users@openrtk.org</a><br>
Date: Tuesday, February 26, 2013, 12:36 AM<br>
<br>
<br>
Hi Micah,<br>
I have given it a try and I think I obtain the expected result if you use the SheppLogan file that we provide here<br>
<a href="http://midas3.kitware.com/midas/download?items=27326" target="_blank">http://midas3.kitware.com/midas/download?items=27326</a><br>
However, the result might surprise you because your source is in the phantom (sid=65.93 vs largest ellipsoid which is A=88.32 B=115.2 C=117.76). You can scale the shepp logan phantom using the following command<br>
rtkprojectshepploganphantom -g geo.xml -o proj.mha --spacing 1 --dimension 1024 --phantomscale 10<br>
You will then obtain more meaningful results, i.e., the full phantom will be in the beam.<br>
Note by the way that if you use rtkfdk afterwards, you will have to be careful to have the source outside the volume as well. I have recently noticed that there was a bug when the source was in the volume, I will fix it as soon as possible.<br>
Simon<br>
<br>
<br>
On Tue, Feb 26, 2013 at 2:23 AM, M Miller <<a href="mailto:croow@yahoo.com">croow@yahoo.com</a>> wrote:<br>
<br>
<br>
<br>
<br>
<br>
<br>
I've been unable to project a phantom, or anything else, at high magnification. Here's the steps I've think should work, but don't.<br>
?<br>
"rtksimulatedgeometry.exe --output=geo.xml --nproj=1600 --arc=360 --sdd=870.86 --sid=65.93"<br>
?<br>
These are the values from my actual CT system. Next I try using rtkprojectgeometricphantom to create some projections.<br>
?<br>
"rtkprojectgeometricphantom -g geo.xml -o projs\projections1024.mha --spacing 1 --dimension 1024 --phantomfile<br>
SheppLogan.txt"<br>
?<br>
Inspecting the output projections shows they're mostly unrecognizable. Repeating these steps with a higher SID does produce the expected phantom projections. I've had no luck using real data, so I thought I'd try a simple phantom, but it's turned out to be not so simple.<br>
?<br>
Is RTK limited somehow with respect to magnification, or are my expectations unrealsitic? Am I missing a command-line switch?<br>
?<br>
Thanks<br>
Micah<br>
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