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Objective:We studied the relationship between impact of dose distribution and energy of radioactive ray in teletherapy with contraceptive ring.Methods:The SI Virtual Water Phantom was used to monitor medium of dose.PTW ionization chamber was used to detect the dose.AP-PA(10 cm × 10 cm) and SAD technique were adopted.Monitoring dose of different locations with different energy of radioactive ray in AP and PA respectively with and without contraceptive ring,repeated 5 times.Results:Dose of with contraceptive ring was lower than that of without contraceptive ring in AP 6 MV-X-ray(P < 0.05),while in PA was no obvious difference(P > 0.05).Dose of except for the center was higher than that of without contraceptive ring in AP and PA 15 MV-X-ray(P < 0.05).For locations,doses of the upper,the left and right were higher than that of the center in AP 6 MV-X-ray(P < 0.05),while in PA was lower(P > 0.05).In AP and PA 15 MV-X-ray,doses of the upper,the left and right was higher than that of the center(P < 0.05).Conclusion:Metallic contraceptive ring would effect the dose distribution of radioactive ray,but influence degree related to locations of contraceptive ring and energy of radioactive ray.
Objective: We studied the relationship between impact of dose distribution and energy of radioactive ray in teletherapy with contraceptive ring. Methods: The SI Virtual Water Phantom was used to monitor medium of dose. PTW ionization chamber was used to detect the dose. AP-PA (10 cm × 10 cm) and SAD technique were applied. Monitoring dose of different locations with different energy of radioactive ray in AP and PA respectively with and without contraceptive ring, repeated 5 times. Results: Dose of with contraceptive ring was lower than that of without contraceptive ring in AP 6 MV-X-ray (P <0.05), while in PA was no obvious difference (P> 0.05) .Dose of except for the center was higher than that of without contraceptive ring in AP and PA 15 For locations, doses of the upper, the left and right were higher than that of the center of the in AP6 MV-X-ray (P <0.05), while in PA was lower (P <0.05) P> 0.05) .In AP and PA 15 MV-X-ray, doses of the upper, the left and right was higher than that of the cen ter (P <0.05) .Conclusion: Metallic contraceptive ring would effect the dose distribution of radioactive ray, but influence degree related to locations of contraceptive ring and energy of radioactive ray.