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25 //
26 //
27 /// \file Dicom2PrimaryGeneratorAction.cc
28 /// \brief Implementation of the Dicom2PrimaryGeneratorAction class
29
30 #include "Dicom2PrimaryGeneratorAction.hh"
31
32 #include "DicomDetectorConstruction.hh"
33
34 #include "G4Box.hh"
35 #include "G4LogicalVolume.hh"
36 #include "G4LogicalVolumeStore.hh"
37 #include "G4ParticleDefinition.hh"
38 #include "G4ParticleGun.hh"
39 #include "G4ParticleTable.hh"
40 #include "G4PhysicalVolumeStore.hh"
41 #include "G4RandomDirection.hh"
42 #include "G4RunManager.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "G4UnitsTable.hh"
45 #include "G4VPhysicalVolume.hh"
46 #include "Randomize.hh"
47
48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49
50 Dicom2PrimaryGeneratorAction::Dicom2PrimaryGeneratorAction()
51 : G4VUserPrimaryGeneratorAction(),
52 fParticleGun(new G4ParticleGun(1)),
53 fEnvelopeBox(nullptr),
54 fEnvelopeVol(nullptr),
55 fPosCenter(G4ThreeVector(0.0)),
56 fPosDelta(G4ThreeVector(0.0)),
57 fGeomFactor(0.8)
58 {
59 // default particle kinematic
60 G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
61 G4String particleName;
62 G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "e-");
63 fParticleGun->SetParticleDefinition(particle);
64 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
65 fParticleGun->SetParticleEnergy(10. * MeV);
66 }
67
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70 Dicom2PrimaryGeneratorAction::~Dicom2PrimaryGeneratorAction()
71 {
72 delete fParticleGun;
73 }
74
75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76
77 void Dicom2PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
78 {
79 // this function is called at the begining of ecah event
80 //
81
82 // In order to avoid dependence of PrimaryGeneratorAction
83 // on DetectorConstruction class we get phantomContainer volume
84 // from G4LogicalVolumeStore.
85 if (!fEnvelopeBox) {
86 G4LogicalVolume* envLV = G4LogicalVolumeStore::GetInstance()->GetVolume("phantomContainer");
87 if (envLV) fEnvelopeBox = dynamic_cast<G4Box*>(envLV->GetSolid());
88 }
89
90 if (!fEnvelopeVol) {
91 fEnvelopeVol = G4PhysicalVolumeStore::GetInstance()->GetVolume("phantomContainer");
92 }
93
94 // get the center of the phantom
95 if (fEnvelopeVol) {
96 fPosCenter = fEnvelopeVol->GetObjectTranslation();
97 }
98 else {
99 G4ExceptionDescription msg;
100 msg << "Envelope physical volume not found.\n";
101 msg << "The gun will be place at the center.";
102 G4Exception("Dicom2PrimaryGeneratorAction::GeneratePrimaries()", "DICOM20002", JustWarning,
103 msg);
104 }
105
106 // get the size of the phantom
107 if (fEnvelopeBox) {
108 fPosDelta =
109 G4ThreeVector(2.0 * fEnvelopeBox->GetXHalfLength(), 2.0 * fEnvelopeBox->GetYHalfLength(),
110 2.0 * fEnvelopeBox->GetZHalfLength());
111 }
112 else {
113 G4ExceptionDescription msg;
114 msg << "Envelope volume of box shape not found.\n";
115 msg << "The gun will be place at the center.";
116 G4Exception("Dicom2PrimaryGeneratorAction::GeneratePrimaries()", "DICOM20003", JustWarning,
117 msg);
118 }
119
120 // start at center
121 G4ThreeVector pos = fPosCenter;
122 // get a random displacement
123 G4ThreeVector delta(fPosDelta.x() * (G4UniformRand() - 0.5),
124 fPosDelta.y() * (G4UniformRand() - 0.5),
125 fPosDelta.z() * (G4UniformRand() - 0.5));
126 // scale by geom factor
127 delta *= fGeomFactor;
128
129 // G4cout << "Starting position: " << G4BestUnit(pos + delta, "Length")
130 // << ", pos = " << G4BestUnit(fPosCenter, "Length")
131 // << ", size = " << G4BestUnit(fPosDelta, "Length")
132 // << ", delta = " << G4BestUnit(delta, "Length")
133 // << G4endl;
134
135 fParticleGun->SetParticlePosition(pos + delta);
136 fParticleGun->SetParticleMomentumDirection(G4RandomDirection());
137 fParticleGun->GeneratePrimaryVertex(anEvent);
138 }
139
140 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
141