[Gate-users] Attenuation Correction of PET Images

Simon Stute gate.stute at gmail.com
Fri Aug 26 18:42:45 CEST 2011


You could do like you say to be as realistic as possible. But CT simulations
are extremely long ! And transmission scans are quite old now (even if still
used on some scanners).
Otherwise, you can manually calculate the attenuation coefficient using the
XMED database for photons at 511keV. That's what I do.
If you are using simple analytical phantoms, you have to create a program to
build images following your different objects and associated attenuation
coefficients, and then project it (using the projector of your
reconstruction tools).
If you are using voxelized phantoms, you can directly translate the
materials to attenuation coefficients and then project it.


On Fri, Aug 26, 2011 at 6:16 PM, Geron Bindseil <geron9 at gmail.com> wrote:

> Dear Gate community,
> Has anyone implemented a method in Gate for producing attenuation
> correction
> factors for PET imaging?
> I'm looking into the possibility of computing attenuation correction
> factors
> directly using the phantom materials that lie along each line of response.
> I
> have read of a few simulated approaches in the literature: using a
> simulated
> CT sinogram, and using a cylindrical ring of activity around the field of
> view to simulate blank and transmission scans.
> Any help or insight you could share would be appreciated.
> Kind Regards,
> Geron
> ---
> Geron Bindseil
> PhD Candidate, Physics
> University of Western Ontario
> London, Ontario, Canada
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