Proton therapy dosimetry using positron emission tomography

Figure 5 Registered PET images are shown in the axial and coronal views through the prostate. The PET images are fused with the planning computed tomography (CT). The CAX is the central beam axis. The field edge is only extended to the isocenter as provided by the TPS. The isocenter in the lateral direction was set to be the location of the marker-defined path. Good alignment between the field edge and the outer surface of the emitter distribution suggests that no prostate motion occurred after proton beam delivery (Reprinted from[36] with permission from Medical Physics).