by Feli, S.K.; Tetteh, G.K. (Ghana Univ., Legon (Ghana). Dept. of Physics); Amuasi, J.H. (Ghana Atomic Energy Commission, Accra (Ghana))
The attainment of high standards of efficiency and reliability in the practice of nuclear medicine requires an appropriate quality assurance programme. Routine monitoring of nuclear medicine instruments, using test procedures that provide check of the quality and reproducibility of instrument performance, aims at giving the user the confidence in the data collected and in updating the performance of the instrument. Quality control testing schedule for rectilinear scanners include weekly density calibration and monthly performance contrast enhancement and collimator evaluation. Discussion in this work is restricted to collimator evaluation which is required to be performed at the initial stages of installation as acceptance reference. However unlike the density, calibration and contrast enhancement, there is no documented work on this for the M800 Scintikart Scanner – a Hungarian Gamma Muvek system belonging to the Korle Bu Hospital, Accra. Tests of linearity of energy, relative sensitivity and resolution including energy and spatial resolutions were conducted in respect of collimator evaluation. In the linearity test it was ascertained that a nonlinear relationship exists between the centre of the window setting and the energy of the photopeak. The spectrometer was calibrated independently for each radionuclide and the position of Tc-99m obtained at 0.45 MeV on the MeV scale. In addition, the F272a13 Collimator offered a better resolution than the routinely used F272a136 collimator which has the highest sensitivity. (author).
Source/Report Journal of the Kumasi University of Science and Technology; v. 13(2); ISSN 0855-0395; CODEN JKUTDP; Jun 1993; p. 89-98; 10 refs.; 1 tab.; 10 figs
Publ. Year 1993