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

[Matthew Strugari]

Hi Hussain,

Could you possibly include your .mac file? Two things to check would be to make sure to have defined attachCrystalSD with your scintillator, and make sure your scintillator is defined as a daughter of SPECThead.

Regards,
Matthew

On Jan 26, 2020, at 1:37 PM, Khalid Hussain <khalidhussain1134 at gmail.com> wrote:


Dear Matthew,

Thank you for your reply.
I added the readout module which I missed previously, but still the situation seems to be same.
# D I G I T I Z E R
/gate/digitizer/Singles/insert adder
/gate/digitizer/Singles/insert readout
/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 59
/gate/output/projection/pixelNumberY 44
/gate/output/projection/projectionPlane XY
 The projection image is still black, no source image is reflected.
<image.png>


Further more, still I cannot see any information in .root file hit and single and others.

Please guide?

Thank you
Regards
Hussain


On Mon, Jan 27, 2020 at 12:35 AM Matthew Strugari <matthew.strugari at dal.ca<mailto:matthew.strugari at dal.ca>> wrote:
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<mailto: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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