Median Polish for Quality Assurance of a PET Scanner

Sorting a large set of heavily used LiF:Mg,Ti thermoluminescent detectors into repeatable subsets of similar response

“…Such behavior is consistent with both short-and long-term sensitivity variations for similar radiation equipment involving PMTs or electronics, such as x-ray transmission computerized tomographs, positron emission tomographs, well counters, dose calibrators, and gamma ray spectroscopy systems (Kearfott et al, 1983(Kearfott et al, , 1984Kearfott, 1989aKearfott, , 1989bKearfott and Rucker, 1989;Dewey and Kearfott, 2008). It is strongly recommended that checks for systematic drift be incorporated into dosimetry programs regardless of whether such drifts are considered to result from the reader or the dosimeters themselves.…”

“…It is strongly recommended that checks for systematic drift be incorporated into dosimetry programs regardless of whether such drifts are considered to result from the reader or the dosimeters themselves. Depending upon the application and the nature of the observed data, more complex methods of monitoring for drift or correction (Kearfott et al, 1983(Kearfott et al, , 1984Kearfott, 1989aKearfott, , 1989bKearfott and Rucker, 1989;Dewey and Kearfott, 2008) may be indicated than those presented here.…”