DICOM/src/DicomPrimaryGeneratorAction.cc

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0027 /// \file medical/DICOM/src/DicomPrimaryGeneratorAction.cc
0028 /// \brief Implementation of the DicomPrimaryGeneratorAction class
0029 //
0030 // The code was written by :
0031 //      *Louis Archambault louis.archambault@phy.ulaval.ca,
0032 //      *Luc Beaulieu beaulieu@phy.ulaval.ca
0033 //      +Vincent Hubert-Tremblay at tigre.2@sympatico.ca
0034 //
0035 //
0036 // *Centre Hospitalier Universitaire de Quebec (CHUQ),
0037 // Hotel-Dieu de Quebec, departement de Radio-oncologie
0038 // 11 cote du palais. Quebec, QC, Canada, G1R 2J6
0039 // tel (418) 525-4444 #6720
0040 // fax (418) 691 5268
0041 //
0042 // + Université Laval, Québec (QC) Canada
0043 //*******************************************************
0044 #include "DicomPrimaryGeneratorAction.hh"
0045
0046 #include "CLHEP/Random/RandFlat.h"
0047 #include "DicomRegularDetectorConstruction.hh"
0048
0049 #include "G4Event.hh"
0050 #include "G4ParticleDefinition.hh"
0051 #include "G4ParticleGun.hh"
0052 #include "G4ParticleTable.hh"
0053 #include "G4SystemOfUnits.hh"
0054 #include "Randomize.hh"
0055
0056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0057 DicomPrimaryGeneratorAction::DicomPrimaryGeneratorAction()
0058   : G4VUserPrimaryGeneratorAction(), fParticleGun(0)
0059 {
0060   G4int nParticle = 1;
0061   fParticleGun = new G4ParticleGun(nParticle);
0062 }
0063
0064 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0065 DicomPrimaryGeneratorAction::~DicomPrimaryGeneratorAction()
0066 {
0067   delete fParticleGun;
0068 }
0069
0070 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0071 void DicomPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0072 {
0073   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0074   G4String particleName;
0075   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "e-");
0076   fParticleGun->SetParticleDefinition(particle);
0077   // put the e- in the x direction of the patient (z in the accelerator axs)
0078   // to hit patient in the central slice of the phantom
0079   G4ThreeVector dir(0, 0, 1);
0080   // G4ThreeVector dir(2.*CLHEP::RandFlat::shoot()-1.,
0081   // 2.*CLHEP::RandFlat::shoot()-1.,-CLHEP::RandFlat::shoot());
0082   dir /= dir.mag();
0083   fParticleGun->SetParticleMomentumDirection(dir);
0084   fParticleGun->SetParticleEnergy(100. * MeV);
0085   // put it at SAD = 1 m on xy plane of central slice
0086   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -120.));
0087   // fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,-22.));
0088   fParticleGun->GeneratePrimaryVertex(anEvent);
0089 }