[Gate-users] Problem in Projection calculation in simulating SPECT/Gamma Camera

[Matthew Strugari]

Hi Hussain,

From first glance, it looks like you’re missing the readout module in the digitizer. Try that out and let me know.

Cheers,
Matthew

On Jan 26, 2020, at 6:03 AM, Khalid Hussain <khalidhussain1134 at gmail.com> wrote:


Dear Gate Users,

I am simulating dual head Gamma Camera with sphere source of volume 1 cm^3 (0.62 cm radius) in the center. I am using the Tc-99m as a source of radioactivity with activity 100 kBq.

I want to see the projection of photons detected by the NaI detector.

For Projection I used the following code

# D I G I T I Z E R
#####

/gate/digitizer/Singles/insert adder
/gate/digitizer/Singles/insert blurring
/gate/digitizer/Singles/blurring/setResolution 0.10
/gate/digitizer/Singles/blurring/setEnergyOfReference 140. keV
/gate/digitizer/Singles/insert spblurring
/gate/digitizer/Singles/spblurring/setSpresolution 2.0 mm
/gate/digitizer/Singles/spblurring/verbose 0
/gate/digitizer/Singles/insert thresholder
/gate/digitizer/Singles/thresholder/setThreshold 126. keV
/gate/digitizer/Singles/insert upholder
/gate/digitizer/Singles/upholder/setUphold 154. keV



# O U T P U T
#####

/gate/output/root/enable
/gate/output/root/setFileName output/benchSPECT
/gate/output/root/setRootSinglesAdderFlag 1
/gate/output/root/setRootSinglesBlurringFlag 1
/gate/output/root/setRootSinglesSpblurringFlag 1
/gate/output/root/setRootSinglesThresholderFlag 1
/gate/output/root/setRootSinglesUpholderFlag 1

# P R O J E C T I O N
#####
/gate/output/projection/enable
/gate/output/projection/setFileName output/myProjection
/gate/output/projection/pixelSizeX 0.48 cm
/gate/output/projection/pixelSizeY 0.48 cm
#/gate/output/projection/pixelNumberX 128
#/gate/output/projection/pixelNumberY 128
/gate/output/projection/projectionPlane XY

I want to analyse the projection, and interested to calculate projection/image specification.
Please see and guide where I am wrong, thanks for your cooperation.

I viewed the projection.sin file in imagej, it has no information also the hits and singles have no as such useful information. Files are attached.
Regards
Hussain
<myProjection.sin>
<myProjection.hdr>
<benchSPECT.root>
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