[Gate-users] Re : SPECT intrinsic spatial resolution
sebnem erturk
sebnem.erturk at gmail.com
Thu Sep 16 20:19:39 CEST 2010
good luck!!!
sebnem
On Thu, Sep 16, 2010 at 7:55 PM, Rajaram, Ramya (H USA) <
ramya.rajaram at siemens.com> wrote:
> I will try your macro. However, in my version, the source is NOT confined,
> just kept the name of the source as SourceConfinement, and it is defined to
> be a point (in which case it doesn't need a shape/type/radius, and I thought
> that simulated a TRUE point source).
>
> -----Original Message-----
> From: sebnem erturk [mailto:sebnem.erturk at gmail.com]
> Sent: Thursday, September 16, 2010 12:39 PM
> To: Rajaram, Ramya (H USA)
> Subject: Re: [Gate-users] Re : SPECT intrinsic spatial resolution
>
> why you are putting your source inside the confinement volume?
>
> I am using below macro to simulate the point source.
>
> # Definition of Simple Gamma Emission: Tc 99m
> #
> /gate/source/addSource SphereSource1
> /gate/source/SphereSource1/setActivity 10000000000 Bq
> /gate/source/SphereSource1/gps/particle gamma
> /gate/source/SphereSource1/gps/energy 140. keV
> /gate/source/SphereSource1/gps/type Volume
> /gate/source/SphereSource1/gps/shape Sphere
> /gate/source/SphereSource1/gps/radius 0.25 mm
> /gate/source/SphereSource1/gps/centre 0. 0. 0. mm
> /gate/source/SphereSource1/gps/angtype iso
> /gate/source/SphereSource1/gps/mintheta 0. deg
> /gate/source/SphereSource1/gps/maxtheta 180. deg
> /gate/source/SphereSource1/gps/minphi 0. deg
> /gate/source/SphereSource1/gps/maxphi 360. deg
> #/gate/source/list
>
>
>
> On Thu, Sep 16, 2010 at 7:30 PM, Rajaram, Ramya (H USA) <
> ramya.rajaram at siemens.com> wrote:
>
>
> Sorry about that - I mean a point source. Planar imaging I said to
> mean that the detector is not rotating or moving. The code for the source
> definition is as follows:
>
> /gate/source/addSource SourceConfinement
> /gate/source/SourceConfinement/gps/type Point
> /gate/source/SourceConfinement/gps/centre 4. 0. 0. mm
> /gate/source/SourceConfinement/gps/particle gamma
> /gate/source/SourceConfinement/gps/energy 140. keV
> /gate/source/SourceConfinement/setActivity 10.e-3 Ci
> /gate/source/SourceConfinement/gps/angtype iso
>
>
> -----Original Message-----
> From: sebnem erturk [mailto:sebnem.erturk at gmail.com]
> Sent: Thursday, September 16, 2010 12:19 PM
> To: Rajaram, Ramya (H USA)
>
> Cc: gate-users at lists.opengatecollaboration.org
> Subject: Re: [Gate-users] Re : SPECT intrinsic spatial resolution
>
> what do you mean by planar image of a point source?
>
> what is the exact geometry of your source? (planar or point? )
>
> cheers,
>
> sebnem
>
>
>
>
>
> On Thu, Sep 16, 2010 at 7:15 PM, Rajaram, Ramya (H USA) <
> ramya.rajaram at siemens.com> wrote:
>
>
> I am simulating planar image of a point source, so there is
> no phantom. Also, I have put in only the collimator and the continuous
> crystal detector - no back compartment or any other layers. I output the
> projection images using the the following code:
>
> /gate/output/projection/enable
> /gate/output/projection/setFileName file6
> /gate/output/projection/pixelSizeX 2.4 mm
> /gate/output/projection/pixelSizeY 2.4 mm
> /gate/output/projection/pixelNumberX 256
> /gate/output/projection/pixelNumberY 256
>
> Thanks,
>
> Ramya
>
>
>
>
>
> -----Original Message-----
> From: Samuel BURG [mailto:samuel_burg at yahoo.fr]
> Sent: Thursday, September 16, 2010 10:35 AM
> To: Rajaram, Ramya (H USA);
> gate-users at lists.opengatecollaboration.org
> Subject: Re : [Gate-users] SPECT intrinsic spatial resolution
>
> 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 --
> -----------------------------------------------------------
>
>
> ________________________________
>
> 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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> --
> Sebnem Erturk
> University of Pisa
> Applied Physics Dpt.
> Largo Pontecorvo
> 56127 Pisa-Italy
> Office :0039 050 2214346
> Mobile :0039 345 3331440
> http://www.df.unipi.it/~fiig/ <http://www.df.unipi.it/%7Efiig/> <
> http://www.df.unipi.it/%7Efiig/>
>
>
>
>
>
>
> --
> Sebnem Erturk
> University of Pisa
> Applied Physics Dpt.
> Largo Pontecorvo
> 56127 Pisa-Italy
> Office :0039 050 2214346
> Mobile :0039 345 3331440
> http://www.df.unipi.it/~fiig/ <http://www.df.unipi.it/%7Efiig/>
>
>
--
Sebnem Erturk
University of Pisa
Applied Physics Dpt.
Largo Pontecorvo
56127 Pisa-Italy
Office :0039 050 2214346
Mobile :0039 345 3331440
http://www.df.unipi.it/~fiig/
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