Fig. 3

Representative images showing the 3-point grading scale for gastric visualization: a1. 1, poor, < 70% of the mucosa was observed; a2. 2, fair, 70–90% of the mucosa was observed; and a3. 3, good, > 90% of the mucosa was observed. b. Representative image of food debris. c. Representative images showing the 4-point grading scale for stomach cleanliness during magnetic capsule endoscopy. c1. 1, poor, large amount of mucus or foam residue; c2. 2, fair, considerable amount of mucus or foam present to preclude a completely reliable examination; c3. 3, good, small amount of mucus and foam, but not enough to interfere with the examination; c4. 4, excellent, no more than small bits of adherent mucus and foam