There is often insufficient access to patients and linear accelerator treatment rooms to train radiotherapy students. An
alternative approach is for some training to use a hybrid virtual environment (HVE) that simulates an actual
radiotherapy treatment machine controlled with the actual machine's handheld control pendant. A study of training
using such a HVE is presented for "skin apposition" treatment, where the patient couch and radiotherapy equipment are
positioned so that the radiation beam strikes the skin perpendicularly. The HVE developed comprises a virtual
treatment room with a linear accelerator, modelled from laser scan data and a virtual patient. A genuine linear
accelerator control handheld "pendant" provided the user interface to the virtual linear accelerator. A virtual patient,
based on the visible human female dataset, complete with rectangular markings for a range of different treatment sites,
provided a range of treatment scenarios. Students were trained in groups with the virtual world being displayed
stereoscopically on a large work-wall. A study of 42 students was conducted to evaluate learning. 93% of students
perceived an improvement in their understanding of this treatment using the HVE and 69% found the control system to
be easy to master.
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