[Gate-users] understanding the ROOT file content

[Xinjie Cao]

Hi Dmitry,

Could you share your full geometry configuration and physics list setting?
That will be easier for all Gaters to see what they could do to help.

And for your following questions, for example, question 5. It would be
better to snapshot the part of the GATE manual you described in your
question so we could know what exactly you talked about and help you.

Hope this helps!

Best,
Xinjie

On Wed, Mar 3, 2021 at 8:41 AM Dmitry Hits <dmitry.hits at phys.ethz.ch> wrote:

> Dear Gate Users,
>
> I am trying to understand the content of the ROOT file.
> I have the following lines that are meant to specify what will be stored
> in it.
>
> #==================================================
> # OUTPUT
> #==================================================
> /gate/output/root/enable
> /gate/output/root/setFileName TrackerHits
> /gate/output/root/setRootHitFlag            1
> /gate/output/root/setRootSinglesFlag        0
> #/gate/output/root/setRootCoincidencesFlag   0
> /gate/output/root/setRootNtupleFlag         0
> /gate/output/root/setRootOpticalFlag        0
>
> I commented out the CoincidencesFlag because it gives me an error.
>
> My goal is to store "Hits" produced in a silicon sensor (see definition
> below).
>
> #system
> /gate/world/daughters/name              scanner
> /gate/world/daughters/insert            box
> /gate/scanner/geometry/setXLength      20 cm
> /gate/scanner/geometry/setYLength      1 mm
> /gate/scanner/geometry/setZLength      20 cm
> /gate/scanner/placement/setTranslation 0.0 0.0 0.0 cm
> /gate/scanner/setMaterial Air
>
> #sensor
> /gate/scanner/daughters/name sensor1
> /gate/scanner/daughters/insert box
> /gate/sensor1/geometry/setXLength      20 cm
> /gate/sensor1/geometry/setYLength      0.174 mm
> /gate/sensor1/geometry/setZLength      20 cm
> /gate/sensor1/setMaterial Silicon
> /gate/sensor1/placement/setTranslation 0.0 0.0 0.0 cm
> /gate/systems/scanner/level1/attach sensor1
> /gate/sensor1/attachCrystalSD
>
> When I open my file with uproot I see the following objects inside:
>
> ['Hits;12',
>  'Hits;11',
>  'latest_event_ID;1',
>  'total_nb_primaries;1',
>  'pet_data;1',
>  'OpticalData;1']
>
> Here are my questions:
> 1. In the "Hits" tree, for each entry (event), I get 10 subentries (sub-events)
> (see below). Each subentry has identical info with exception of the
> volumeID. The volumeID have values 0, 3 and -1.
> Does someone know:
> - Why  there are so many subentries?
> - What  is the meaning of the volumeID? I have only one sensor, shouldn't
> that mean only one volume?
> 2. Why is there two "Hits" trees? Comparing  them tells  me that  they are
> identical.
> 3. Why the cycle numbers of the trees have such high numbers? (12 and  11)
>  Are they re-written  many times? What determines the cycle numbers?
> 4. Even though I set setRootOpticalFlag 0 I still get OpticalData tree,
> why is that?
> 5. One more thing I failed to understand after reading the manual. What is
> the meaning of the "level" in relation to the sensor? I randomly used
> "level1" but I am not sure if that was a correct choice.
>
> PDGEncoding trackID parentID trackLocalTime time edep stepLength
> trackLength posX posY ... axialPos rotationAngle volumeID processName
> comptVolName RayleighVolName septalNb sourceType decayType gammaType
> entry subentry
> 0 0 2212 1 0 8.399597e-10 8.399597e-10 0.0655 0.174008 250.097992
> -3.211607 -0.087 ... 0.0 0.0 0 Transportation NULL NULL 0 0 0 0
> 1 2212 1 0 8.399597e-10 8.399597e-10 0.0655 0.174008 250.097992 -3.211607
> -0.087 ... 0.0 0.0 3 Transportation NULL NULL 0 0 0 0
> 2 2212 1 0 8.399597e-10 8.399597e-10 0.0655 0.174008 250.097992 -3.211607
> -0.087 ... 0.0 0.0 0 Transportation NULL NULL 0 0 0 0
> 3 2212 1 0 8.399597e-10 8.399597e-10 0.0655 0.174008 250.097992 -3.211607
> -0.087 ... 0.0 0.0 -1 Transportation NULL NULL 0 0 0 0
> 4 2212 1 0 8.399597e-10 8.399597e-10 0.0655 0.174008 250.097992 -3.211607
> -0.087 ... 0.0 0.0 -1 Transportation NULL NULL 0 0 0 0
>
>
> Sorry for the long email.
>
> Cheers,
>
> Dmitry
>
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-- 
*....................................................*
*Xinjie Cao*
*M.E. / Ph.D. Candidate*
*Research Project Assistant*
*Department of Electrical and Computer Engineering & Radiology *
*Novel Medical Imaging Technologies Lab*
*Health Science Center Level 8*
*Stony Brook, NY 11794-8460 *
*Tel: +1 (631)202-9445*
you.stonybrook.edu/goldan/people/
*email: **xinjie.cao at stonybroo*k.edu <xinjie.cao at stonybrook.edu>


*....................................................*
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