Blood on-line detector calibration file
The calibration of blood radioactivity curve measured using on-line detector ("blood pump") requires a file containing the measured calibration coefficients. PET physicists are responsible of the calibration measurements and the updating of the calibration file, currently in /pet-storage/Lab/plasma/bsampler_calibration/pump_cal.dat (UNIX) or S:\Lab\plasma\bsampler_calibration\pump_cal.dat (Windows).
The calibration file is in ASCII text format, and it contains the calibration dates, and the detector-to-gamma counter coefficients for each of the three different on-line detectors (3rd one was installed during summer 2004), and the common gamma counter-to-pet coefficient.
The contents of the on-line detector calibration file on autumn 2004 was:
# YYYY-MM-DD Pump1(ecat) Pump2(ge) Pump3(allogg) WizardGammacounter 1900-01-01 51 47 1 0.00270 1997-07-01 47 42 1 0.00270 1999-12-15 43 40 1 0.00270 2000-01-13 46.5 42.5 1 0.00270 2000-09-06 45.9 44.6 1 0.00288 2000-11-15 44.9 42.5 1 0.00288 2000-12-05 48.5 45.4 1 0.00288 2001-02-02 46.0 41.6 1 0.00288 2001-03-28 47.8 44.3 1 0.00288 2001-06-07 48.1 43.5 1 0.00288 2001-09-18 42 37 1 0.00288 2001-11-14 44.5 41.4 1 0.00288 2001-12-13 47.5 40 1 0.00277 2002-02-07 47.5 144 1 0.00277 2002-02-26 45.7 133 1 0.00277 2002-03-12 45 40 1 0.00277 2002-12-12 45 41 1 0.00277 2003-06-07 45 42 1 0.00277 2003-08-20 44 41 1 0.00278 2004-01-16 47 41 1 0.00278 2004-09-09 47 41 14 0.00278 2004-09-29 45 40 14 0.00278
For accurate calibration, also the isotope of the tracer must be known to apply a correct branching ratio correction. All calibration steps can be done using program blo2kbq.
