Borders must be visible, lines must Monthly for dry Print the TG18-QC test pattern. Control chart showing: Printer QC be straight, all corner patches must lasers and daily or (if applicable) Check visibility and distortion of several Date test performed. be visible, squares of different as used for wet items used for evaluating the quality of Person performing test. shades from black to white must lasers the image. be distinct, all high contrast Printer identification. for disturbing artefacts. resolution patterns and the two Test results. pixel low contrast patterns must Measure MD, DD, B+F and Dmax be visible in all four corners, the A record of at least the last 5% and 95% pixel value squares 25 results. must be clearly visible, and no Clearly marked control disturbing artefacts should be limits. visible on the printed TG18-QC pattern. Remarks regarding corrective actions and The number of letters visible in the baseline changes. phrase "Quality Control" for the dark, mid-grey and light renditions should be ≥11 The mid density (MD) and density difference (DD) = baseline 0.15 Base + fog (B+F) = baseline 0.03 and ≤0.25 Dmax = baseline ± 0.10 and ≥3.4 Repeat analysis Overall repeat rate Six monthly Analysis of the proportion of repeats attributable Records showing: ˂20% to positioning, a of equipment faults and (ACR, 1999) Date analysis performed. other reasons for 6 months or from at least 150 Person performing task. consecutive stereotactic examinations. Results and any corrective actions.
Printer QC (if applicable) Borders must be visible, lines must be straight, all corner patches must be visible, squares of different shades from black to white must be distinct, all high contrast resolution patterns and the two pixel low contrast patterns must be visible in all four corners, the 5% and 95% pixel value squares must be clearly visible, and no disturbing artefacts should be visible on the printed TG18-QC pattern. The number of letters visible in the phrase "Quality Control" for the dark, mid-grey and light renditions should be ≥11 The mid density (MD) and density difference (DD) = baseline 0.15 Base + fog (B+F) = baseline 0.03 and ≤0.25 Dmax = baseline ± 0.10 and ≥3.4 Monthly for dry lasers and daily or as used for wet lasers Print the TG18-QC test pattern. Check visibility and distortion of several items used for evaluating the quality of the image. for disturbing artefacts. Measure MD, DD, B+F and Dmax Control chart showing: Date test performed. Person performing test. Printer identification. Test results. A record of at least the last 25 results. Clearly marked control limits. Remarks regarding corrective actions and baseline changes. Repeat analysis Overall repeat rate ˂20% (ACR, 1999) Six monthly Analysis of the proportion of repeats attributable to positioning, a of equipment faults and other reasons for 6 months or from at least 150 consecutive stereotactic examinations. Records showing: Date analysis performed. Person performing task. Results and any corrective actions.
BSA%20NAS%20com_endorsed%20by%20SCoS%20Oct.docx