RE: Model estimate of dose

From: "Nick Holford" n.holford@auckland.ac.nz Subject: RE: [NMusers] Model estimate of dose Date: Tue, December 7, 2004 3:13 pm Johan, With the additional information you provide then it seems the problem is quite simple. But it does depend on what assumptions you make about what the gamma camera is measuring. If the gamma camera is calibrated in such a way that it measures the total AMOUNT of radioactivity in the same units as the actually administered dose (e.g. Curies or Bequerels or whatever ...) then the problem can be solved using $PRED: $PRED K=THETA(k)*EXP(ETAk) DOSE=THETA(dose)*EXP(ETAdose) Y=DOSE*EXP(-K*TIME) + EPS If the gamma camera is not calibrated in units that involve the actual dose then there is no way to compute the actual dose from the gamma camera data. Nick