[Castor-users] Scatter rate estimation for LM-TOF-MLEM

[Marina Filipovic]

Hi Jacub,

Have you divided the estimated TOF bin scatter rates with the spatial width
of the TOF bin, directly in the list-mode datafile, as explained in the
documentation (general and TOF-specific) ?

Marina

On Wed, 18 Aug 2021, 00:52 jbaran, <jakub.baran at ifj.edu.pl> wrote:

> Dear Castor Developers and Users,
>
> I am trying to incorporate the information about the scatter correction
> in LM-TOF-MLEM reconstruction. I have calculated the scatter fraction
> for each TOF bin. The values of scatter rate are in range 1-2. I have
> applied them for the reconstruction, however the reconstructed images
> seem to be not corrected for scatter. Please find the attached
> screenshot. On the top panel, the reconstructed image with true+scatter
> coincidences is presented and on the bottom the same coincidences were
> used but with scatter correction applied. On the right corresponding
> line profiles are presented (ots - no scatter correction; corrected1 -
> scatter correction applied)
>
> FYI: The total number of coincidences used for the reconstruction is 1
> order of magnitude lower than the number of possible LORs.
>
> Do you have any idea what kind of values should be applied for the
> scatter rate? Did you have any similar case and found the solution how
> the scatter rate should be calculated?
>
> All the best,
> Jakub
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