HadrontherapyDetectorROGeometry.cc

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//
// This is the *BASIC* version of Hadrontherapy, a Geant4-based application
// See more at: http://g4advancedexamples.lngs.infn.it/Examples/hadrontherapy
//
// Visit the Hadrontherapy web site (http://www.lns.infn.it/link/Hadrontherapy) to request 
// the *COMPLETE* version of this program, together with its documentation;
// Hadrontherapy (both basic and full version) are supported by the Italian INFN
// Institute in the framework of the MC-INFN Group
//

#include "HadrontherapyDetectorROGeometry.hh"
#include "HadrontherapyDummySD.hh"
#include "G4SystemOfUnits.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
#include "G4Box.hh"
#include "G4ThreeVector.hh"
#include "G4Material.hh"

HadrontherapyDetectorROGeometry::HadrontherapyDetectorROGeometry(G4String aString,
                                 G4ThreeVector pos,
                                 G4double detectorDimX,
                                 G4double detectorDimY,
                                 G4double detectorDimZ,
                                 G4int numberOfVoxelsX,
                                 G4int numberOfVoxelsY,
                                 G4int numberOfVoxelsZ):
   
    G4VReadOutGeometry(aString),
    detectorToWorldPosition(pos),
    detectorSizeX(detectorDimX),
    detectorSizeY(detectorDimY),
    detectorSizeZ(detectorDimZ),
    numberOfVoxelsAlongX(numberOfVoxelsX),
    numberOfVoxelsAlongY(numberOfVoxelsY),
    numberOfVoxelsAlongZ(numberOfVoxelsZ)
{
}

HadrontherapyDetectorROGeometry::~HadrontherapyDetectorROGeometry()
{
}

G4VPhysicalVolume* HadrontherapyDetectorROGeometry::Build()
{
  // A dummy material is used to fill the volumes of the readout geometry.
  // (It will be allowed to set a NULL pointer in volumes of such virtual
  // division in future, since this material is irrelevant for tracking.)

  G4Material* dummyMat = new G4Material(name="dummyMat", 1., 1.*g/mole, 1.*g/cm3);

  G4double worldSizeX = 200.0 *cm;
  G4double worldSizeY = 200.0 *cm;
  G4double worldSizeZ = 200.0 *cm;

  G4double halfDetectorSizeX = detectorSizeX;
  G4double halfDetectorSizeY = detectorSizeY;
  G4double halfDetectorSizeZ = detectorSizeZ;

  // World volume of ROGeometry ...
  G4Box* ROWorld = new G4Box("ROWorld",
                 worldSizeX,
                 worldSizeY,
                 worldSizeZ);
  
  G4LogicalVolume* ROWorldLog = new G4LogicalVolume(ROWorld, dummyMat, 
                            "ROWorldLog", 0,0,0);
  
  G4VPhysicalVolume* ROWorldPhys = new G4PVPlacement(0,G4ThreeVector(), 
                             "ROWorldPhys", 
                             ROWorldLog, 
                             0,false,0);

  // Detector ROGeometry 
  G4Box *RODetector = new G4Box("RODetector", 
                   halfDetectorSizeX, 
                   halfDetectorSizeY, 
                   halfDetectorSizeZ);

  G4LogicalVolume *RODetectorLog = new G4LogicalVolume(RODetector,
                               dummyMat,
                              "RODetectorLog",
                              0,0,0);
  
  G4VPhysicalVolume *RODetectorPhys = new G4PVPlacement(0,
                            detectorToWorldPosition,
                            "DetectorPhys",
                            RODetectorLog,
                            ROWorldPhys,
                            false,0);
  
  
  // Division along X axis: the detector is divided in slices along the X axis
  
  G4double halfXVoxelSizeX = halfDetectorSizeX/numberOfVoxelsAlongX;
  G4double halfXVoxelSizeY = halfDetectorSizeY;
  G4double halfXVoxelSizeZ = halfDetectorSizeZ;
  G4double voxelXThickness = 2*halfXVoxelSizeX;

  G4Box *RODetectorXDivision = new G4Box("RODetectorXDivision",
                     halfXVoxelSizeX,
                     halfXVoxelSizeY,
                     halfXVoxelSizeZ);
  
  G4LogicalVolume *RODetectorXDivisionLog = new G4LogicalVolume(RODetectorXDivision,
                                   dummyMat,
                                   "RODetectorXDivisionLog",
                                   0,0,0);

  G4VPhysicalVolume *RODetectorXDivisionPhys = new G4PVReplica("RODetectorXDivisionPhys",
                                                              RODetectorXDivisionLog,
                                                              RODetectorPhys,
                                                              kXAxis,
                                                              numberOfVoxelsAlongX,
                                                              voxelXThickness);

  // Division along Y axis: the slices along the X axis are divided along the Y axis

  G4double halfYVoxelSizeX = halfXVoxelSizeX;
  G4double halfYVoxelSizeY = halfDetectorSizeY/numberOfVoxelsAlongY;
  G4double halfYVoxelSizeZ = halfDetectorSizeZ;
  G4double voxelYThickness = 2*halfYVoxelSizeY;

  G4Box *RODetectorYDivision = new G4Box("RODetectorYDivision",
                    halfYVoxelSizeX, 
                    halfYVoxelSizeY,
                    halfYVoxelSizeZ);

  G4LogicalVolume *RODetectorYDivisionLog = new G4LogicalVolume(RODetectorYDivision,
                                   dummyMat,
                                   "RODetectorYDivisionLog",
                                   0,0,0);
 
  G4VPhysicalVolume *RODetectorYDivisionPhys = new G4PVReplica("RODetectorYDivisionPhys",
                                  RODetectorYDivisionLog,
                                  RODetectorXDivisionPhys,
                                  kYAxis,
                                  numberOfVoxelsAlongY,
                                  voxelYThickness);
  
  // Division along Z axis: the slices along the Y axis are divided along the Z axis

  G4double halfZVoxelSizeX = halfXVoxelSizeX;
  G4double halfZVoxelSizeY = halfYVoxelSizeY;
  G4double halfZVoxelSizeZ = halfDetectorSizeZ/numberOfVoxelsAlongZ;
  G4double voxelZThickness = 2*halfZVoxelSizeZ;
 
  G4Box *RODetectorZDivision = new G4Box("RODetectorZDivision",
                    halfZVoxelSizeX,
                    halfZVoxelSizeY, 
                    halfZVoxelSizeZ);
 
  G4LogicalVolume *RODetectorZDivisionLog = new G4LogicalVolume(RODetectorZDivision,
                                   dummyMat,
                                   "RODetectorZDivisionLog",
                                   0,0,0);
 
  RODetectorZDivisionPhys = new G4PVReplica("RODetectorZDivisionPhys",
                       RODetectorZDivisionLog,
                       RODetectorYDivisionPhys,
                       kZAxis,
                       numberOfVoxelsAlongZ,
                       voxelZThickness);

  HadrontherapyDummySD *dummySD = new HadrontherapyDummySD;
  RODetectorZDivisionLog -> SetSensitiveDetector(dummySD);

  return ROWorldPhys;
}