Real time recording with the MTS-1 (example from one subject). 1A: The position x, y and z and orientation θ and ϕ are displayed. Position of the sensor array over the body is seen to the left. To the right a recording of the movement through the duodenal arch is displayed. 1B: Duodenal passage (from 17 m 40 s to 19 m 30 s) is seen as a change in position (x, y and z) (arrow 1) and disappearance of the characteristic 3 contractions min-1 pattern of the stomach (θ and ϕ) (arrow 2). The curve at the bottom shows noise from respiration and movement.