[Gate-users] Re : SPECT intrinsic spatial resolution

[Samuel BURG]

Yes, GATE do apply a spatial blurring in your projection when using 
/gate/digitizer/Singles/spblurring/setSpresolution

but to help you, we need your full macro file.
also remember that the collimator, phantom scattering and the background 
compartment of the PMT play a lot in sp resolution.

 -----------------------------------------------------------
Samuel Burg


Mail : <samuel_burg at yahoo.fr>
-----------------------------------------------------------
"Aw, come on, who would be so stupid as to insert a cast
to make an error go away without actually fixing the error?"
Apparently everyone. 
-- Raymond Chen --
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________________________________
De : "Rajaram, Ramya (H USA)" <ramya.rajaram at siemens.com>
À : gate-users at lists.opengatecollaboration.org
Envoyé le : Jeu 16 septembre 2010, 16h 59min 48s
Objet : [Gate-users] SPECT intrinsic spatial resolution

Dear Gaters,

Does GATE really convolve the intrinsic spatial resolution for SPECT? I
have generated 256x256 projection images from two macros, both identical
except for the fact that in one, the spResolution is set to 3.7 mm, in
the other it is set to 0 mm and yet, the two images look identical. A
simple profile also gives me the same system resolution for both - leads
me to think the spResolution is somehow not being convolved -- could
someone please explain/help?

The following code is what I used to set the digitizer up:

/gate/digitizer/Singles/insert adder
/gate/digitizer/Singles/insert blurring
/gate/digitizer/Singles/blurring/setResolution 0.09
/gate/digitizer/Singles/blurring/setEnergyOfReference 140. keV
/gate/digitizer/Singles/insert spblurring
/gate/digitizer/Singles/spblurring/setSpresolution 0. mm (3.7 mm)
/gate/digitizer/Singles/spblurring/verbose 2
/gate/digitizer/Singles/insert thresholder
/gate/digitizer/Singles/thresholder/setThreshold 50. keV
/gate/digitizer/Singles/insert upholder
/gate/digitizer/Singles/upholder/setUphold 200. keV

Thank you very much,

Ramya

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