An imaging method uses a radiation source, shielding body, therapeutic head, and treatment device. The imaging method uses the radiation source is applied in the treatment device. The treatment device includes a radiation source. The imaging method comprises: the radiation source emitting a radiation beam having a first energy； primary scattering the radiation beam emitted by the radiation source to emit a radiation beam having a second energy； the radiation beam after primary scattering passing through a human body lesion, wherein the second energy is lower than the first energy； receiving the radiation beam passing through the human body lesion； and establishing a lesion image according to the received radiation beam.
