2-D ultrasound imaging 1 Article 1 Cerebral Palsy 1 Child 1 Child, Preschool 1 Children with cerebral palsies 1 Clinical practices 1 Coefficient of variation 1 Correlation coefficient 1 Diseases 1 Elasticity 1 Elasticity Imaging Techniques 1 Female 1 Gastrocnemius muscle 1 Humans 1 Male 1 Medical imaging 1 Muscle 1 Muscle structure Muscle, Skeletal 1 Observer Variation 1 Reliability 1 Reproducibility of Results 1 Shear flow 1 Shear wave elastography 1 Shear waves 1 Spastic muscles 1 Tibialis anterior 1 Ultrasonics 1 Ultrasonography 1