iaea human health series publications - SEDIM

FIG. 21. Radiologist workstation with the same clinical image displayed on both monitors.7.2.1.4. Interpretation of results and conclusions(1) Viewing conditions for the radiologist workstation should be as recommended by the medical physicist.(2) There should be no noticeable artefacts in the TG18-QC image. These might include diagonal lines,flickering, blotches, non-uniform greyscale ramps, curved ‘straight’ lines and bright or dark pixels.(3) All 16 luminance patches should be distinct from each other in shade in the TG18-QC image.(4) The smaller, 5% contrast squares in the TG18-QC image should be visible in both the dark (0–5%) and light(95–100%) squares.(5) The letters ‘QUALITY CONT’ should be visible in each of the three regions of the TG18-QC image on theradiologist workstations.(6) The images on all radiologist workstations should appear to be visually identical (i.e. the same brightness andcontrast).(7) A clinical image check should establish that the background is black, that image contrast is adequate and thatthe brightness or contrast settings of the two monitors are well matched.7.2.1.5. Recommendations and corrective actionsIf results are outside of tolerance or are unacceptable, the tests should be repeated. If the results remainunacceptable, it may be appropriate to contact the responsible medical physicist for further advice with regard toimplementing the recommendations listed below:(1) If viewing conditions appear unacceptable or do not correspond to those indicated by the medical physicist,consider changing the position of workstations.(2) If artefacts are evident in the TG18-QC images, contact the monitor service person.(3) If not all 16 luminance patches are distinct, it may be necessary to recalibrate the monitors. If recalibrationfails to correct the problem, contact the monitor service person.(4) If the luminance 5% difference squares are not visible, the monitors may need to be recalibrated. Ifrecalibration fails to correct the problem, contact the monitor service person.(5) If any of the letters in ‘QUALITY CONT’ in any of the three regions on the primary display devices(radiologist workstations) are not visible, the monitors may need to be recalibrated or the room lighting levelmay need to be changed. If recalibration fails to correct the problem, contact the monitor service person.53