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Group Cancer type Mean setup time (min:s) SD (min:s) Estimated mean setup dose (μSv) SD (μSv) Radiation therapists Lung 5:22 2:11 4.94 3.78 Head and neck cancer 4:49 1:45 3.93 1.51 Nuclear medicine technologists Lung 1:58 0:24 3.30 1.28 Head and neck cancer 2:12 0:38 3.10 1.78 Number of scans performed Mean setup dose (μSv) n ≥5 4.91 13 <5 3.66 7