J Med Phys Close
 

Figure 1: Structure of the indigenous flattening filter-free medical linear accelerator considered in the Monte Carlo calculation. The dashed line is the Z-axis, with the positive X direction to the right and the Y direction coming out of the page. The origin is on the target surface at position 0. The main components of linac head consist of the target, primary collimator, ion chamber, and secondary collimator

Figure 1: Structure of the indigenous flattening filter-free medical linear accelerator considered in the Monte Carlo calculation. The dashed line is the Z-axis, with the positive X direction to the right and the Y direction coming out of the page. The origin is on the target surface at position 0. The main components of linac head consist of the target, primary collimator, ion chamber, and secondary collimator