Traditional radiotherapy (x-ray, gamma ray)

Conventionally, radiation considerably affects normal cells on the body’s surface before it reaches the focal lesion, and has a weakness that the radiation is reduced and weakened at the focal lesion, and unable to demonstrate the potential effectiveness of radiotherapy fully.

 

 

 

 

Proton beam (particle beam) irradiation

Proton beam (particle beam) therapy has a characteristic that the radiation level reaches a peak at a particular depth (a Bragg peak).
Radiation can be concentrated on only the focal lesion while keeping damages to normal cells low, because cancer is irradiated by matching the peak position to the focal cancer.

 

 

 

Dose distribution curve

There is much expectation placed upon proton therapy as a wonderful new therapy that is highly effective and disturbs normal tissue the least, compared to traditional radiation, as seen from the Bragg peak characteristics of dose distribution curve.