Cylinderhead 1 2 3 4 5 6 7 8 9 10 Ultrasound 19.3 21.8 21.2 23.1 22.8 22.3 21.5 21.9 19.8 20.4 Sectioning 20.7 21.6 20.9 23.6 22.5 23.5 22.4 22.7 21.1 19.9