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Study on 3D-Dose Distribution of 192Ir HDR Intracavitary Brachytherapy for Cervix Cancer Patients by TLD and Anthropomorphic Pelvic Phantom |
ZHANG Shu-xu1,2, LI Wen-hua2, XU Hai-rong2, et al |
Gunagzhou Tumor Hospital, Guangzhou 510095 China |
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Abstract Objective To investigate the feasibility of checking the 3D-dose distribution of 192Ir HDR intracavitary brachytherapy for cervix cancer patients by TLD and anthropomorphic pelvic phantom.Methods The heating program,the range of dose linear response,the reproducibility and the calibration factor of the TLD (JR1152-F,1 mm×1 mm×6 mm) were determined.The tissue equivalent pelvic phantom was cut into six segments and a set of small holes (φ1×6 mm) were drilled at the interesting organs on each segment to hold the TLDs.The lead markers (φ1×6 mm) were placed in the holes.After the tandem catheter had been put into the treatment position,the orthogonal X-films could be taken and the lead markers were replaced by the TLDs.An orthogonal radiography-based brachytherapy treatment planning was designed by microSelectron HDR treatment planning system (TPS) with the prescription dose to Point A of 200 cGy.The doses to each measuring position were calculated.After the treatment plan was delivered,the doses to each TLD were measured by dosimeter.Results The range of dose linear response of the TLD is within 300 cGy with correlation coefficient of 0.997.The average reproducibility is less than ±4.0%.The calculated and measured dose values are in good coincidence at Pont A,Point B,Point F,bladder and rectum reference points.The relative errors for those positions are within ±3.6%,±0.9%,±7.8%,±7.1% and 6.4%,respectively.Conclusion The JR1152-F TLD and the anthropomorphic pelvic phantom are accurate and reliable in checking the 3D-dose distribution of 192Ir HDR intracavitary brachytherapy for cervix cancer patients.
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Received: 03 January 2005
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[1] |
MIAO Hui, SHI Linxin, BAI Haisheng, SHAO Weixian, YUAN Cheng, LIU Yazhou, SUN Suping, CHEN Honglin, LUO Jujian, HUI Hua, ZHANG Wen. Dosimetric study on intensity-modulated radiotherapy with dissimilar position on peripheral normal tissues and organs of cervical cancer[J]. , 2018, 27(4): 381-384. |
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