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

[Simon Rit]

This is not a RTK question but an ITK question... mha is the file
format of ITK. Many readers around, some are matlab:
http://www.itk.org/pipermail/insight-users/2005-May/013134.html
The difference between mha and mhd is that the second separates the
data in two files, raw and header, not mha.
Simon

On Thu, Feb 28, 2013 at 3:39 PM, 古月 <hdb1991a2012 at gmail.com> wrote:
> 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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>> Today's Topics:
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>>    1. Re: trouble projecting phantom (M Miller)
>>
>>
>> ----------------------------------------------------------------------
>>
>> 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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>> End of Rtk-users Digest, Vol 6, Issue 6
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