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Table 4 Frequency of quality control tests performed by radiographers presented by country (n = frequency; (%) = percentage)

From: Characterization of radiographers’ mammography practice in five European countries: a pilot study

  Estonia Finland Norway Portugal Switzerland Total
Detector stability test and flat-field phantom image
 Never 1 (13) 0 0 0 7 (11) 8 (6)
 Daily 7 (87) 37 (97) 8 (89) 10 (56) 7 (11) 69 (50)
 Weekly 0 0 1 (11) 2 (11) 49 (74) 37 (52)
 Monthly 0 0 0 2 (11) 3 (4) 5 (4)
 Quarterly or semi-annually 0 1 (3) 0 4 (22) 0 5 (4)
QC test object and full-field artefacts
 Never 4 (51) 0 6 (67) 2 (11) 5 (8) 17 (12)
 Daily 2 (25) 24 (63) 2 (22) 1 (6) 0 29 (21)
 Weekly 1 (12) 11 (29) 0 8 (44) 59 (90) 79 (57)
 Monthly 0 1 (3) 0 3 (17) 1 (1) 5 (4)
 Quarterly, semi-annually or annually 1 (12) 2 (5) 1 (11) 4 (22) 1 (1) 9 (6)
Artefacts
 Never 1 (12) 0 1 (11) 3 (18) 2 (3) 7 (5)
 Daily 1 (12) 27 (71) 1 (11) 11 (62) 25 (38) 65 (47)
 Weekly 5 (64) 6 (16) 6 (67) 1 (5) 38 (58) 56 (40)
 Monthly 0 3 (8) 0 2 (10) 1 (1) 6 (4)
 Quarterly, semi-annually or annually 1 (12) 2 (5) 1 (11) 1 (5) 0 5 (4)
Monitor QC
 Never 6 (76) 4 (11) 7 (78) 9 (50) 8 (12) 34 (25)
 Daily 0 9 (24) 1 (11) 2 (11) 5 (8) 17 (12)
 Weekly 1 (12) 13 (34) 0 4 (22) 44 (67) 62 (45)
 Monthly 0 5 (13) 0 1 (6) 4 (6) 10 (7)
 Quarterly, semi-annually or annually 1 (12) 7 (18) 1 (11) 2 (11) 5 (7) 16 (11)
Printer/laser printer
 Never 0 34 (90) 0 15 (83) 42 (64) 91 (66)
 Daily 3 (37) 1 (3) 4 (44) 2 (11) 3 (4) 13 (9)
 Weekly 4 (50) 0 5 (56) 0 11 (17) 20 (14)
 Monthly 1 (13) 1 (3) 0 0 4 (6) 6 (4)
 Quarterly, semi-annually or annually 0 2 (4) 0 1 (6) 6 (9) 9 (7)