Optimization of the Compton camera for measuring prompt gamma rays (0.478MeV) emitted
during boron neutron capture therapy (BNCT) was performed with Geant4. The parameters
of the Compton camera were determined as follows: 3cm thick - 10cm wide scatter detector
(Silicon), 10cm thick - 10cm wide absorber detector (Germanium), and 1cm distance
between the scatter and absorber detectors. For a typical brain tumor treatment, the
overall detection efficiency of the optimized Compton camera was approximately 0.1425%
using the Snyder's head phantom with a sphere tumor (4cm diameter and ~1cm depth).