[Gate-users] definition of sinograms

[Eva Ribežl]

Dear Gate users,

I have a question regarding defining sinograms in Gate. In file
GateRootDefs.cc, sinogramS is defined as:

/{
  G4double s;

  G4double denom = (globalPosY1-globalPosY2) * (globalPosY1-globalPosY2) +
                   (globalPosX2-globalPosX1) * (globalPosX2-globalPosX1);
 
  if (denom!=0.) {
    denom = sqrt(denom);

    s = ( globalPosX1 * (globalPosY2-globalPosY1) +
      globalPosY1 * (globalPosX1-globalPosX2)  )
          / denom;
  } else {
    s = 0.;
  }/

How is this connected to the usual definition of sinograms (s being the
distance between centre and LOR)?

Thanks for any comment,

Eva

-- 
Eva Ribežl
Jozef Stefan Institute, Experimental Particle Physics Department, Jamova 39, Ljubljana, Slovenia