Fig. 1

A The mixed reality simulator of lumbar puncture used in the study. In the virtual environment, the puncture process of the subjects was displayed on in real-time the laptop screen; B The 3-dimensional images were sighted with HoloLens smart glasses of Microsoft. The photo was taken with the camera of Glasses, was 2-dimensional and looked deformed compared to the 3-dimensional image seen in Glasses. In fact, in the glasses, it was a realistic 3D image