Figure 3

(a) Sensor setup for 4D-MRI (left) and 4D-CT (right). For 4D-MRI, the bellow sensor was set to the position where it could stably detect the movement from the motion phantom insert. (b) For 4D-CT, the RPM sensor was set to the position where it could stably detect the phantom motion. RPM refers to real-time position management.