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KMID : 1164220090210010009
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Journal of Korean Society for Radiotherapeutic Technology
2009 Volume.21 No. 1 p.9 ~ p.15
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Evaluating the Efficiency of the Device in Shielding Scattered Radiation during Treatment of Carcinoma of the Penis
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Kim Yang-Su
Lee Sun-Young
Lim Seok-Geon
Kwak Geun-Tak
Park Ju-Kyeong
Lee Seung-Hun
Hwang Ho-In
Cha Seok-Yong
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Abstract
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Purpose: We evaluated the device that was created for maintaining the patient’s setup and protecting the testicles from scattered radiation during treatment of carcinoma of the penis.
Materials and Methods: The phantom testicles were made of vaseline cotton gauze and the device consisted of 5 mm of acryl box and 4 mm of lead shielding. 3×3㎠,4×4㎠ ,5×5 ㎠ ,6×6㎠ , 7×7㎠ field sizes were used for this study and measurement was made at 4, 5, 6, 7, 8, 10 cm from the lower edge of the field for 10 times with lead shielding and without the shielding respectively. 200 cGy was delivered using 6 MV photons.
Results: The scatted radiation without lead shielding at 4, 5, 6, 7, 8, 10 cm from the lower edge of the field were 14.8-4.7 cGy with 3×3㎠, 15.7-5.2 cGy with 4×4㎠, 17.6-5.5 cGy with 5×5㎠, 19.9-6.6 cGy with 6×6㎠, 22.2-7.6 cGy with 7×7㎠ and the measured dose without lead shielding were 7.1-2.6 cGy with 3×3㎠ , 8.9-3.6 cGy with 4×4㎠ , 12.3-4.8 cGy with 5×5 ㎠, 14.6-5.0 cGy with 6×6㎠ and 21.1~6.4 cGy with 7×7㎠. As shown above, the scatted radiation decreased after using lead shielding. Depending of the range of field sizes, the resulting difference between without shielding values and with shielding values were: 7.8-1.1 cGy at 4 cm, 5.1-1.2 cGy at 5 cm, 3.8-1.1 cGy at 6 cm, 3.4-1.7 cGy at 7 cm, 2.8-1.7 cGy at 8 cm, 2.4-2.5 cGy at 9 cm and 2.1-1.8 cGy at 10 cm. In the situation as described above, the range in values depending on the distance was 7.8-1.1 cGy with 3×3㎠, 6.9-1.6 cGy with 4×4㎠ , 5.3-0.8 cGy with 5×5 ㎠ , 5.3-1.5 cGy with 6×6㎠ and 1.1-1.8 cGy with 7×7㎠ .
Conclusion: Using the device we created to shield the testicles from scattered radiation during treatment of carcinoma of the penis, we have found that scattered radiation to the testicles is decreased by the phantom testicles, and by increasing the distance between the testicles and penis.
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KEYWORD
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carcinoma of the penis, testis shielding, device
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