[Castor-users] Image reconstruction in CASToR

[Maxime Toussaint]

Greetings,

What do you mean by "I am not getting the correct image"? I have no idea of what is your "correct image" in your context.

My first random guess would be that the "problem" lies in the fact that you used a weird image space without knowing it. Most of the time, you need to set two of the following for a reconstruction: voxel size, FoV size and the number of voxels. In your case, you defined one of them (-dim), so I would guess that the default values of your scanner were used for the other two. If the FoV default size was used, it would means that your voxel would have the same length as the FoV in the z-axis which would clearly give weird results. To deal with this, either set the FoV size or the voxel size when using castor-recon.

Bests,
Maxime Toussaint


________________________________
De : Castor-users <castor-users-bounces at lists.castor-project.org> de la part de Sowmiya Raj Thirumalai <sthirum6 at asu.edu>
Envoyé : 16 octobre 2019 02:31
À : castor-users at lists.castor-project.org <castor-users at lists.castor-project.org>
Objet : [Castor-users] Image reconstruction in CASToR

Hi All,

   I installed CASToR version 2.1. I simulated Discovery 710 PET system in GATE with brain_phantom.h33 interfile and brain_phantom.i33 raw image. I stored the output in ROOT and used CASToR command to get the .Cdh file. I am trying to reconstruct the image but I am not getting the correct image. I used the following for castor-recon. I am attaching the files for reference. Could anyone please let me know what I am missing? I tried to open them with ImageJ (Import->Raw with parameters as 16 bit unsigned, 256 pixels, first image offset as 1, total no of images as 10, little endian byte order and use virtual stack).

castor-recon -df PET_phantom_voxel_df.Cdh -opti MLEM -it 10:16 -proj joseph -conv gaussian,4.,4.5,3.5::psf -dim 32,32,1 -dout PET_phantom_voxel_recon

16 images in the interfile. So, I have given 10 iterations of each image (subset)
interfile matrix is 32x32. So, I have given dimensions as 32x32x1

  Also, could anyone please let me know if castor-recon can be used for obtaining images of the particle track from PET simulation with a cylinder phantom?

Thanks & Regards
Sowmiya
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