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Journal of Medical Sciences
  Year: 2014 | Volume: 14 | Issue: 4 | Page No.: 162-167
DOI: 10.3923/jms.2014.162.167
 
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Comparison of Radiation Absorbed Dose Received by Bladder and Rectum between Conventional and Conformal Treatment Planning Methods in Radiotherapy of Prostate Cancer

Karim Khoshgard and Seyed Ali Rahimi

Abstract:
Nowadays prostate cancer is the second widespread cancer among men. It is important to use new techniques in radiation therapy of prostate cancer that make lower exposure to normal tissues. Not withstanding the conformal radiotherapy methods with 3-dimensional treatment planning which are known as 3-D conformal radiotherapy and IMRT are using for radiotherapy of prostate cancer, the Co-60 Unit with conventional 2-dimensional treatment planning is still using for radiotherapy of prostate cancer in some of radiotherapy centers, particular in developing countries. Therefore, this study is designed to evaluate the method that, with using of shielding blocks and 3-D treatment planning instead of 2-D planning for Co-60 unit therapy, is able to reduce the received dose by critical uninvolved organs such as bladder and rectum. Both treatment planning methods were done on a tissue-equivalent and anthropomorphic phantom in the way of equally weighted 4-field (Box method), that consist of two pairs of parallel-opposed anterioposterior and right and left lateral beams to deliver 200 cGy to isocenter point. The TLD-100 dosimeters were used for measuring the absorbed doses of rectum and bladder. Cerrobend blocks for shaping each radiation field were constructed and used in 3-D treatment planning method. The experiments were repeated five times and absorbed dose values compared with paired student's t-test for a confidence level of 95%. The average of measured values of received dose by bladder and rectum in 2-D conventional treatment planning were 117.5±3.4, 120.5±4.6, 80.4±3.8 and 77±3.2 cGy, respectively, in 3-D conformal treatment planning. The results show that use of Cerrobend blocks in 3-D conformal treatment planning, significantly reduces the absorbed dose to critical uninvolved structures in proportion to 2-D conventional radiotherapy of prostate cancer with using Co-60 unit.
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How to cite this article:

Karim Khoshgard and Seyed Ali Rahimi, 2014. Comparison of Radiation Absorbed Dose Received by Bladder and Rectum between Conventional and Conformal Treatment Planning Methods in Radiotherapy of Prostate Cancer. Journal of Medical Sciences, 14: 162-167.

DOI: 10.3923/jms.2014.162.167

URL: https://scialert.net/abstract/?doi=jms.2014.162.167

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