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J Korean Med Assoc > Volume 51(7); 2008 > Article
Kim and Park: Proton Beam Therapy

Abstract

Proton is quite different from x-ray in terms of energy emission. As it enters a cancer patient's body through skin and tissue, it releases a relatively low dose of energy before it reaches the target. It, however, hits the targeted tumor by depositing the biggest dose of energy on it, then suddenly stopping its activity afterwards. The point where the highest energy is released is called as the Bragg peak. The proton beam has many advantages over the conventional x-ray beam because the proton beam radiates primarily the tumor site, leaving the surrounding healthy tissue and organs totally unharmed or relatively less damaged. Thus, the patients can enjoy much more enhanced quality-of-life during and after the treatment as well as have a high probability to be cured from their diseases.

References

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Figure 1
Dose distribution of proton beam and x-ray.
jkma-51-638-g001-l.jpg
Figure 2
Computer planning of proton therapy for patient with hepatocellular carcinoma. The normal liver volume irradiated with x-ray beam (upper) is much larger than proton beam (lower).
jkma-51-638-g002-l.jpg
Figure 3
Comparison between conventional x-ray therapy and proton therapy for whole spinal irradiation.
jkma-51-638-g003-l.jpg
Figure 4
Graphic structural design of Proton Therapy Center in National Cancer Center (Goyang, Korea), which is composed of cyclotron, beam transport system, two rotating gantry and one fixed beam rooms.
jkma-51-638-g004-l.jpg


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