**3.3 Treatment plan**

The BNCT dose calculation program (NeuCure® dose engine Sumitomo Heavy Industries, Ltd.) was developed and approved as a medical device. The Monte Carlo code uses a simulation code called PHITS, which enables BNCT dose calculation, as well as additional functions such as external I/F including security checks, and is developed as a dose engine dedicated to BNCT dose calculation. RayStation (RaySearch Japan Co., Ltd.), a general-purpose radiotherapy program, is used for the user interface, and it has an improved drawing function and excellent operability similar to the state-of-the-art radiotherapy equipment (**Figure 4**).
