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Geant4/examples/extended/medical/DICOM/src/DicomPrimaryGeneratorAction.cc

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 26 //
 27 /// \file medical/DICOM/src/DicomPrimaryGeneratorAction.cc
 28 /// \brief Implementation of the DicomPrimaryGeneratorAction class
 29 //
 30 // The code was written by :
 31 //      *Louis Archambault louis.archambault@phy.ulaval.ca,
 32 //      *Luc Beaulieu beaulieu@phy.ulaval.ca
 33 //      +Vincent Hubert-Tremblay at tigre.2@sympatico.ca
 34 //
 35 //
 36 // *Centre Hospitalier Universitaire de Quebec (CHUQ),
 37 // Hotel-Dieu de Quebec, departement de Radio-oncologie
 38 // 11 cote du palais. Quebec, QC, Canada, G1R 2J6
 39 // tel (418) 525-4444 #6720
 40 // fax (418) 691 5268
 41 //
 42 // + Université Laval, Québec (QC) Canada
 43 //*******************************************************
 44 #include "DicomPrimaryGeneratorAction.hh"
 45 
 46 #include "CLHEP/Random/RandFlat.h"
 47 #include "DicomRegularDetectorConstruction.hh"
 48 
 49 #include "G4Event.hh"
 50 #include "G4ParticleDefinition.hh"
 51 #include "G4ParticleGun.hh"
 52 #include "G4ParticleTable.hh"
 53 #include "G4SystemOfUnits.hh"
 54 #include "Randomize.hh"
 55 
 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 57 DicomPrimaryGeneratorAction::DicomPrimaryGeneratorAction()
 58   : G4VUserPrimaryGeneratorAction(), fParticleGun(0)
 59 {
 60   G4int nParticle = 1;
 61   fParticleGun = new G4ParticleGun(nParticle);
 62 }
 63 
 64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 65 DicomPrimaryGeneratorAction::~DicomPrimaryGeneratorAction()
 66 {
 67   delete fParticleGun;
 68 }
 69 
 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 71 void DicomPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 72 {
 73   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
 74   G4String particleName;
 75   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "e-");
 76   fParticleGun->SetParticleDefinition(particle);
 77   // put the e- in the x direction of the patient (z in the accelerator axs)
 78   // to hit patient in the central slice of the phantom
 79   G4ThreeVector dir(0, 0, 1);
 80   // G4ThreeVector dir(2.*CLHEP::RandFlat::shoot()-1.,
 81   // 2.*CLHEP::RandFlat::shoot()-1.,-CLHEP::RandFlat::shoot());
 82   dir /= dir.mag();
 83   fParticleGun->SetParticleMomentumDirection(dir);
 84   fParticleGun->SetParticleEnergy(100. * MeV);
 85   // put it at SAD = 1 m on xy plane of central slice
 86   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -120.));
 87   // fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,-22.));
 88   fParticleGun->GeneratePrimaryVertex(anEvent);
 89 }
 90