[gate-users] sample image from my IQ_phantom simulation

[Mutanga Theodore]

Hi Ross
thanks for the hints

> Hi Theodore,
>
> Attenuation correction can be done via STIR by building an attenuation
> coefficient image and then using the projection data correction routine
> to scale the data properly.
What if my phantom is complex like the IQ phantom I designed that from
previous macros from you I suppose,(maybe we should check and see if it is
alright, i'll attach a copy of that macro to you) of what if Im using
voxel phantoms how can I use stir to build this attenuation image ? or
will CT image data of the phantom do ?
That's probably the most straight forward
> method.  Also, arc correction is important in order to avoid object

Can we do arc correction with the new version of stir (test2 1.4?)
Have you done that with stir ?
> distortions for this phantom.
>
> I have been doing a similar reconstruction with the DLS and have been
> unsure about the counting statistics with respect to the contrast
> ratios.  How many coincidences do you have in your image data? Im
generating about 10^6 coincidences but the warm sphere is completely
lost. If you dont mind ill like to know how your source distribution
looks like int the macros. The computation time is astronomical with
increased activity for the sources! If I didn't have the cluster I won't
be able to manage.

cheers

>
> Cheers,
>
> ross
>
> -----Original Message-----
> From: gate-users-bounces at lphe1pet1.epfl.ch
> [mailto:gate-users-bounces at lphe1pet1.epfl.ch] On Behalf Of Mutanga
> Theodore
> Sent: Thursday, September 15, 2005 7:20 AM
> To: gate-users at lphe1pet1.epfl.ch
> Subject: [gate-users] sample image from my IQ_phantom simulation
>
> I will like to present an image that I obtained using a simulation of
> the Discovery St and reconstruction with stir for the iq-phantom, some
> spheres are missing and there is heavy attenuation , I am currently
> exploring ways of simulating and correcting for attenuation with GATe
> and STIR, any suggestions?
>
>
>
>
>
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