Journal of Medical Physics
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Year : 2003  |  Volume : 28  |  Issue : 4  |  Page : 238-242

Physical Aspects And Methodology Of Three Dimensional Conformal External Radiation Therapy

Correspondence Address:
S S Narayanan

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Source of Support: None, Conflict of Interest: None

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In modem radiotherapy, treatment planning plays a vital role in optimal dose delivery. The treatment plan for execution should include optimal beam arrangement, minimum complexity in execution, minimum possible dose to the normal organs surrounding the tumor without jeopardizing the tumor conformity and dose. This is greatly achievable through three dimensional conformal radiation therapy. With the advent of various diagnostic tools, such as CT scan, the dose distribution to the tumor and the surrounding normal organs can be effectively computed. The tumor conformity is achieved, mainly, by using either conformal block or multi-leaf collimators of modern linear accelerators. This development of state-of-the-art three dimensional conformal radiation treatment planning in radiation therapy helps in tumor dose escalation with minimum possible acute and late morbidity and possible higher tumor control rate. This paper describes, in detail, the physical aspects and methodology of three-dimensional conformal radiation therapy.

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