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Table 2 Assessment of image quality

From: Impact of penalizing factor in a block-sequential regularized expectation maximization reconstruction algorithm for 18F-fluorocholine PET-CT regarding image quality and interpretation

  Observers (median, range)  
  #1 #2 #3 #4 #5 Overall
1.5 min, β 300 2 (1–3) 2 (2–4) 2 (1–3) 3 (2–4) 2 (1–2) 2
1.5 min, β 400 3 (1–3) 3 (2–4) 2.5 (2–5) 3 (2–4) 2 (2–3) 3
1.5 min, β 500 3 (3–4) 3 (3–4) 3 (3–4) 3 (2–4) 3 (2–4) 3
2.0 min, β 300 2 (1–3) 3.5 (2–4) 2 (1–5) 4 (3–4) 2 (2–3) 3
2.0 min, β 400 3.5 (1–4) 3 (3–4) 3 (2–4) 3 (2–4) 3 (2–4) 3
2.0 min, β 500 3 (3–4) 3 (2–4) 3 (3–4) 2.5 (2–3) 3.5 (2–4) 3
2.0 min, OSEM 3.5 (2–4) 3 (2–3) 2.5 (1–3) 2 (2) 2.5 (2–3) 2.5
  1. Assessment of image quality. Assessment of median (and range) image quality in 18F-FCH PET-CT examinations by five observers by grading images on a scale 1–5 (where 1 = unacceptable image quality and 5 = very high image quality) for the remaining ten patients for each image. The overall median image quality score for each series of reconstructions is also presented