[Rtk-users] Rtk-users Digest, Vol 6, Issue 6

[古月]

Hi,
   I have a problem. how to read the .mha file? Can i use the matlab?
Debin

2013/2/28 <rtk-users-request at openrtk.org>

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>    1. Re: trouble projecting phantom (M Miller)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 26 Feb 2013 21:45:48 -0800 (PST)
> From: M Miller <croow at yahoo.com>
> Subject: Re: [Rtk-users] trouble projecting phantom
> To: Simon Rit <simon.rit at creatis.insa-lyon.fr>
> Cc: rtk-users at openrtk.org
> Message-ID:
>         <1361943948.94604.YahooMailClassic at web163804.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Scaling the phantom worked perfectly.
> 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?
> ?
> Thanks
> Micah
>
> --- On Tue, 2/26/13, Simon Rit <simon.rit at creatis.insa-lyon.fr> wrote:
>
>
> From: Simon Rit <simon.rit at creatis.insa-lyon.fr>
> Subject: Re: [Rtk-users] trouble projecting phantom
> To: "M Miller" <croow at yahoo.com>
> Cc: rtk-users at openrtk.org
> Date: Tuesday, February 26, 2013, 12:36 AM
>
>
> Hi Micah,
> I have given it a try and I think I obtain the expected result if you use
> the SheppLogan file that we provide here
> http://midas3.kitware.com/midas/download?items=27326
> 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
> rtkprojectshepploganphantom -g geo.xml -o proj.mha --spacing 1 --dimension
> 1024 --phantomscale 10
> You will then obtain more meaningful results, i.e., the full phantom will
> be in the beam.
> 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.
> Simon
>
>
> On Tue, Feb 26, 2013 at 2:23 AM, M Miller <croow at yahoo.com> wrote:
>
>
>
>
>
>
> 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.
> ?
> "rtksimulatedgeometry.exe --output=geo.xml --nproj=1600 --arc=360
> --sdd=870.86 --sid=65.93"
> ?
> These are the values from my actual CT system. Next I try using
> rtkprojectgeometricphantom to create some projections.
> ?
> "rtkprojectgeometricphantom -g geo.xml -o projs\projections1024.mha
> --spacing 1 --dimension 1024 --phantomfile
> SheppLogan.txt"
> ?
> 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.
> ?
> Is RTK limited somehow with respect to magnification, or are my
> expectations unrealsitic? Am I missing a command-line switch?
> ?
> Thanks
> Micah
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