Fig. 1.
Measurement device. Measurement device with ultrasound probe in probeholder. The ultrasound probe can rotate around the z-axis and slide horizontally (craniocaudal) along the y-axis. The gelatin-embedded cervical spine can be rotated around the gelatin-embedded cervical model (GECM) axis. Two crossing laserbeams project the center of the ultrasound image on the cervical spinal model.