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KMID : 1164220120240020061
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Journal of Korean Society for Radiotherapeutic Technology
2012 Volume.24 No. 2 p.61 ~ p.66
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Comparison of Dose When Prescribed to Point A and Point H for Brachytherapy in Cervical Cancer
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Gang Ji-Hyeong
Kim Il-Hwan
Hwang Seon-Bung
Im Hyeong-Seo
Gang Jin-Mook
Kim Gi-Hwan
Lee Ah-Ram
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Abstract
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Purpose: The purpose of this study is to compare plans prescribed to point A with these prescribed to point H recommended by ABS (American Brachytherapy Society) in high dose rate intracavitary brachytherapy for cervical carcinoma. Materials and
Methods: This study selected 103 patients who received HDR (High Dose Rate) brachytherapy using tandem and ovoids from March 2010 to January 2012. Point A, bladder point, and rectal point conform with Manchester System. Point H conforms with ABS recommendation. Also Sigmoid colon point, and vagina point were established arbitrarily. We examined distance between point A and point H. The percent dose at point A was calculated when 100% dose was prescribed to point H. Additionally, the percent dose at each reference points when dose is prescribed to point H and point A were calculated.
Results: The relative dose at point A was lower when point H was located inferior to point A. The relative doses at bladder, rectal, sigmoid colon, and vagina points were higher when point H was located superior to point A, and lower when point H was located inferior to point A.
Conclusion: This study found out that as point H got located much superior to point A, the absorbed dose of surrounding normal organs became higher, and as point H got located much inferior to point A, the absorbed dose of surrounding normal organs became lower. This differences dose not seem to affect the treatment. However, we suggest this new point is worth being considered for the treatment of HDR if dose distribution and absorbed dose at normal organs have large differences between prescribed to point A and H.
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KEYWORD
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point A, point H, high dose rate intracavitary brachytherapy
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