[Gate-users] How to make complicate phantom

Tue Feb 17 04:05:08 CET 2015

Hello. Marc.

Thank you for your kind advice.

I made phantom and detector (for detect x-ray).

Here is part of my code.

# P H A N T O M

# Create the phantom volume (Plastic)

##

/gate/world/daughters/name Phantom

/gate/world/daughters/insert cylinder

/gate/Phantom/geometry/setRmax 2 cm

/gate/Phantom/geometry/setHeight 4 cm

/gate/Phantom/placement/setTranslation 0 0 0 cm

/gate/Phantom/placement/setRotationAxis 0 1 0

/gate/Phantom/placement/setRotationAngle 90 deg

/gate/Phantom/setMaterial Plastic

/gate/Phantom/vis/setColor blue

/gate/Phantom/vis/forceWireframe

(Made outer cylinder)

#

# Create the phantom volume (Air for Ce)

#

/gate/Phantom/daughters/name Phantom_Air_1

/gate/Phantom/daughters/insert cylinder

/gate/Phantom_Air_1/geometry/setRmax 0.5 cm

/gate/Phantom_Air_1/geometry/setHeight 3.9 cm

/gate/Phantom_Air_1/placement/setTranslation 0 1.05 0 cm

/gate/Phantom_Air_1/setMaterial Air

/gate/Phantom_Air_1/vis/setColor blue

/gate/Phantom_Air_1/vis/forceWireframe

(First hole in cylinder)

#

# Create the phantom volume (Air for Gd)

#

/gate/Phantom/daughters/name Phantom_Air_2

/gate/Phantom/daughters/insert cylinder

/gate/Phantom_Air_2/geometry/setRmax 0.5 cm

/gate/Phantom_Air_2/geometry/setHeight 3.9 cm

/gate/Phantom_Air_2/placement/setTranslation -0.909327 -0.525 0 cm

/gate/Phantom_Air_2/setMaterial Air

/gate/Phantom_Air_2/vis/setColor blue

/gate/Phantom_Air_2/vis/forceWireframe

(Second hole in cylinder)

#

# Create the phantom volume (Air for W)

#

/gate/Phantom/daughters/name Phantom_Air_3

/gate/Phantom/daughters/insert cylinder

/gate/Phantom_Air_3/geometry/setRmax 0.5 cm

/gate/Phantom_Air_3/geometry/setHeight 3.9 cm

/gate/Phantom_Air_3/placement/setTranslation 0.909327 -0.525 0 cm

/gate/Phantom_Air_3/setMaterial Air

/gate/Phantom_Air_3/vis/setColor blue

/gate/Phantom_Air_3/vis/forceWireframe

(Third hole in cylinder)

#

# Create the phantom (detector) volume (Ce)

##

/gate/world/daughters/name Inner_Phantom_1

/gate/world/daughters/systemType SPECThead

/gate/world/daughters/insert cylinder

/gate/Inner_Phantom_1/geometry/setRmax 0.5 cm

/gate/Inner_Phantom_1/geometry/setHeight 3.9 cm

/gate/Inner_Phantom_1/placement/setRotationAxis 0 1 0

/gate/Inner_Phantom_1/placement/setRotationAngle 90 deg

/gate/Inner_Phantom_1/placement/setTranslation 0 1.05 0 cm

/gate/Inner_Phantom_1/setMaterial Cerium

/gate/Inner_Phantom_1/vis/setColor grey

(First detector in cylinder hole)

#

# Create the phantom crystal (detector) volume (Ce)

##

/gate/Inner_Phantom_1/daughters/name Inner_Phantom_Crystal_1

/gate/Inner_Phantom_1/daughters/insert cylinder

/gate/Inner_Phantom_Crystal_1/geometry/setRmax 0.5 cm

/gate/Inner_Phantom_Crystal_1/geometry/setHeight 3.9 cm

/gate/Inner_Phantom_Crystal_1/placement/setTranslation  0. 0. 0. cm

/gate/Inner_Phantom_Crystal_1/setMaterial Cerium

/gate/Inner_Phantom_Crystal_1/vis/setColor yellow

(First detector crystal in cylinder hole)

#

# Create the phantom (detector) volume (Gd)

##

/gate/world/daughters/name Inner_Phantom_2

/gate/world/daughters/systemType SPECThead

/gate/world/daughters/insert cylinder

/gate/Inner_Phantom_2/geometry/setRmax 0.5 cm

/gate/Inner_Phantom_2/geometry/setHeight 3.9 cm

/gate/Inner_Phantom_2/placement/setRotationAxis 0 1 0

/gate/Inner_Phantom_2/placement/setRotationAngle 90 deg

/gate/Inner_Phantom_2/placement/setTranslation 0 -0.525 0.909327 cm

/gate/Inner_Phantom_2/setMaterial Gadolinium

/gate/Inner_Phantom_2/vis/setColor grey

(Second detector in cylinder hole)

#

# Create the phantom crystal (detector) volume (Gd)

##

/gate/Inner_Phantom_2/daughters/name Inner_Phantom_Crystal_2

/gate/Inner_Phantom_2/daughters/insert cylinder

/gate/Inner_Phantom_Crystal_2/geometry/setRmax 0.5 cm

/gate/Inner_Phantom_Crystal_2/geometry/setHeight 3.9 cm

/gate/Inner_Phantom_Crystal_2/placement/setTranslation  0. 0. 0. cm

/gate/Inner_Phantom_Crystal_2/setMaterial Gadolinium

/gate/Inner_Phantom_Crystal_2/vis/setColor yellow

(Second detector crystal in cylinder hole)

#

# Create the phantom (detector) volume (W)

##

/gate/world/daughters/name Inner_Phantom_3

/gate/world/daughters/systemType SPECThead

/gate/world/daughters/insert cylinder

/gate/Inner_Phantom_3/geometry/setRmax 0.5 cm

/gate/Inner_Phantom_3/geometry/setHeight 3.9 cm

/gate/Inner_Phantom_3/placement/setRotationAxis 0 1 0

/gate/Inner_Phantom_3/placement/setRotationAngle 90 deg

/gate/Inner_Phantom_3/placement/setTranslation 0 -0.525 -0.909327 cm

/gate/Inner_Phantom_3/setMaterial Tungsten

/gate/Inner_Phantom_3/vis/setColor grey

(Third detector in cylinder hole)

#

# Create the phantom crystal (detector) volume (W)

##

/gate/Inner_Phantom_3/daughters/name Inner_Phantom_Crystal_3

/gate/Inner_Phantom_3/daughters/insert cylinder

/gate/Inner_Phantom_Crystal_3/geometry/setRmax 0.5 cm

/gate/Inner_Phantom_Crystal_3/geometry/setHeight 3.9 cm

/gate/Inner_Phantom_Crystal_3/placement/setTranslation  0. 0. 0. cm

/gate/Inner_Phantom_Crystal_3/setMaterial Tungsten

/gate/Inner_Phantom_Crystal_3/vis/setColor yellow

(Thihrd detector crystal in cylinder hole)

# S Y S T E M

######

# The system acts as an interpretor between the GATE geometry and data outputs for reconstruction 

# in our case, the Interfile writer

# A system must know which components of the geometry are parts of the scanner, and what 

# their role are.

# For the moment, there is only a system SPECThead, which was built when the SPECThead volume

# was inserted. 

# The SPECThead system is made of three levels: base (for the head), crystal (for the crystal and crystal matrix) 

# and pixel (for individual crystals for pixellated gamma camera)

# For now, only the base of the system is attached to a volume: the volume SPECThead

# For the system to get information about your crystal, the level crystal must be attached to the volume 

# that has been defined for the scintillating crystal (crystal)

##

#/gate/systems/SPECT_CdTe/crystal/attach Crystal_CdTe

##/gate/systems/SPECT_CdTe/describe

#/gate/systems/SPECT_CsI/crystal/attach Crystal_CsI

##/gate/systems/SPECT_CsI/describe

/gate/systems/Inner_Phantom_1/crystal/attach Inner_Phantom_Crystal_1

#/gate/systems/Inner_Phantom_1/describe

/gate/systems/Inner_Phantom_2/crystal/attach Inner_Phantom_Crystal_2

#/gate/systems/Inner_Phantom_2/describe

/gate/systems/Inner_Phantom_3/crystal/attach Inner_Phantom_Crystal_3

#/gate/systems/Inner_Phantom_3/describe

(Attach crystal to detector)

# S E N S I T I V E   D E T E C T O R S

######

# GATE provides two sensitive detectors, which have two different functions

# Using them properly is very important for getting accurate results

##

# Crystal SD

#

# The crystal SD makes it possible to record hits in a sensitive volume (e.g.,. in a scintillation crystal)

# It must be attached to any volume for which hit-data must be obtained

# For recording hits in the NaI volume only, the name of which is crystal, this volume is attached 

# to the crystal SD

##

#/gate/Crystal_CdTe/attachCrystalSD

#/gate/Crystal_CsI/attachCrystalSD

/gate/Inner_Phantom_Crystal_1/attachCrystalSD

/gate/Inner_Phantom_Crystal_2/attachCrystalSD

/gate/Inner_Phantom_Crystal_3/attachCrystalSD

(Attach crystal to detector)

# Phantom SD

#

# The phantom SD makes it possible to record Compton events in the volumes within the field of view

# This can provide information for result analysis to discriminate between 

# scattered and unscattered photons

# It must be attached to each and every volume for whom Compton interactions have to be recorded

##

/gate/Phantom/attachPhantomSD

/gate/Phantom_Air_1/attachPhantomSD

/gate/Phantom_Air_2/attachPhantomSD

/gate/Phantom_Air_3/attachPhantomSD

/gate/SPECT_CdTe/attachPhantomSD

/gate/Collimator/attachPhantomSD

/gate/SPECT_CsI/attachPhantomSD

#/gate/Inner_Phantom_1/attachPhantomSD

#/gate/Inner_Phantom_2/attachPhantomSD

#/gate/Inner_Phantom_3/attachPhantomSD

(Attach phantom to detector)

When I simulate by using this code, empty single and hit data are obtained.

What is the problem ?? Could you tell me about that ??

Thank you.

From: Marc Chamberland [mailto:MarcChamberland at cmail.carleton.ca] 
Sent: Monday, February 16, 2015 11:18 PM
To: 윤창연
Cc: Gate Users
Subject: Re: [Gate-users] How to make complicate phantom

Hi, 

This can all be found in the User’s Guide: http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.0:Defining_a_geometry#Creating_a_volume

For example, create a water cylinder (or whatever material you want), then three daughter cylinders (daughters of your main phantom cylinder) made of air.

As for detectors: I don’t know what you mean. Detect what? I’m assuming you’re not doing imaging applications (PET or SPECT), so you want to measure dose? Energy spectrum? In any case, you need Actors: http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.0:Readout_parameters_for_Radiotherapy_applications:_Actors

Cheers,

Marc

__________________________

Marc Chamberland, MSc

PhD candidate
Department of Physics
Carleton University
Ottawa (ON)

On Feb 16, 2015, at 03:26, 윤창연 <yudoldosa at hanmail.net <mailto:yudoldosa at hanmail.net> > wrote:

Hello, Gate users.

I want to make cylinder phantom with three hole like below figure.

<image002.png>

And three detectors are placed in each hole. What can I do ??

Thank you.

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