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25
26 //GEANT4 - Depth-of-Interaction enabled Positron emission tomography (PET) advanced example
27
28 //Authors and contributors
29
30 // Author list to be updated, with names of co-authors and contributors from National Institute of Radiological Sciences (NIRS)
31
32 // Abdella M. Ahmed (1, 2), Andrew Chacon (1, 2), Harley Rutherford (1, 2),
33 // Hideaki Tashima (3), Go Akamatsu (3), Akram Mohammadi (3), Eiji Yoshida (3), Taiga Yamaya (3)
34 // Susanna Guatelli (2), and Mitra Safavi-Naeini (1, 2)
35
36 // (1) Australian Nuclear Science and Technology Organisation, Australia
37 // (2) University of Wollongong, Australia
38 // (3) National Institute of Radiological Sciences, Japan
39
40
41 #include "doiPETSteppingAction.hh"
42 #include "doiPETAnalysis.hh"
43 #include "doiPETRun.hh"
44 #include "doiPETEventAction.hh"
45
46 #include "G4Step.hh"
47 #include "G4RunManager.hh"
48 #include "G4SteppingManager.hh"
49
50 #include "G4SystemOfUnits.hh"
51 #include "G4PhysicalConstants.hh"
52 #include <limits>
53
54 ////////// Constructor //////////////////////////////////////////////
55 /*doiPETSteppingAction::doiPETSteppingAction()
56 {;}*/
57 doiPETSteppingAction::doiPETSteppingAction()
58 : G4UserSteppingAction()
59 { }
60
61 ///////// Destructor ////////////////////////////////////////////////
62 doiPETSteppingAction::~doiPETSteppingAction()
63 {;}
64
65 ///////// UserSteppingAction ///////////////////////////////////////
66 void doiPETSteppingAction::UserSteppingAction(const G4Step* aStep)
67 {
68 doiPETRun* run = static_cast<doiPETRun*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());
69
70 G4Track* track = aStep->GetTrack();
71 G4String volumeName = aStep->GetPreStepPoint()->GetPhysicalVolume()->GetName();
72 G4double edep = aStep->GetTotalEnergyDeposit();
73 G4String processName =aStep->GetPostStepPoint()->GetProcessDefinedStep()->GetProcessName();
74 G4String particleName = track->GetDynamicParticle()->GetDefinition()->GetParticleName();
75 //G4int eventID = G4RunManager::GetRunManager()->GetCurrentEvent() -> GetEventID();
76 G4ThreeVector pos = track->GetPosition();
77
78
79 //G4StepPoint* p2 = aStep->GetPostStepPoint();
80 G4StepPoint* p1 = aStep->GetPreStepPoint();
81 G4ThreeVector coord1 = p1->GetPosition();
82
83 //The following is to get the local position of the interaction with respect to the crystal block volume
84 const G4AffineTransform transformation = p1->GetTouchable()-> GetHistory()->GetTransform(2);
85 G4ThreeVector localPosition = transformation.TransformPoint(coord1);
86
87 G4int blockID;
88 G4int crystalID;
89
90 G4int scatterIndex = 0;//For checking
91
92 //If an event is created in a cold region or outside the physical volume, then it will be killed.
93 if((volumeName != "phantom_physicalV" || volumeName == "coldRegion_physicalV") && particleName== "e+"){
94 track->SetTrackStatus(fStopAndKill);
95 return;
96 }
97
98 //Get the source position if the process name is annihilation
99 if(processName == "annihil" && volumeName=="phantom_physicalV"){
100 doiPETAnalysis::GetInstance()->SetSourcePosition(pos);
101 run->SetAnnihilationTime((track->GetGlobalTime()));
102 }
103
104 //get event ID
105 //doiPETAnalysis::GetInstance()->SetEventID (eventID);
106
107 //Get scatter information in the phantom by the annihilation photon before detected by the detector. Note that the scatter index is initialized to 0.
108 //If there energy deposition in the phantom by the photon, then there is scatter, the index is 1, and if not it is 0.
109 if(edep > 0 && particleName == "gamma" && volumeName == "phantom_physicalV"){
110 scatterIndex = 1;
111 doiPETAnalysis::GetInstance()->SetScatterIndexInPhantom(scatterIndex);
112 }
113
114 /////////////////// Retrive (Extract) information in the crystal ///////////////////////////
115 if(edep>0. && volumeName=="Crystal_physicalV"){
116
117 //get the copy number of the block
118 blockID = aStep->GetPreStepPoint()->GetTouchableHandle()->GetCopyNumber(2);
119
120 //get the crystal copy number
121 crystalID = aStep->GetPreStepPoint()->GetTouchableHandle()->GetCopyNumber(0);
122
123 //G4cout<<localPosition.x()<<" "<<localPosition.y()<<" "<<localPosition.z()<<G4endl;
124
125 //get event ID
126 //doiPETAnalysis::GetInstance()->GetEventID (eventID);
127
128 //define a pointer for extracting information
129 InteractionInformation* ExtractIntInfo = new InteractionInformation();
130
131 //get the energy deposition of each interaction
132 ExtractIntInfo->SetEdep( edep );
133
134
135 //get the blockID
136 ExtractIntInfo->SetBlockNo( blockID );
137
138
139 //get the crystal ID
140 ExtractIntInfo->SetCrystalNo( crystalID );
141
142
143 //get local position interaction in the crystal
144 ExtractIntInfo->SetInteractionPositionInCrystal(localPosition);
145
146 //get the global time of the interaction with the crystal
147 ExtractIntInfo->SetGlobalTime( track->GetGlobalTime());
148
149 //pass all the obtained information to the doiPETAnalysis class
150 //doiPETAnalysis::GetInstance()->GetIntractionInfomation(ExtractIntInfo);
151 run->GetIntractionInfomation(ExtractIntInfo);
152
153 }
154 }
155