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KMID : 0357520170400020303
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Journal of Radiological Science and Technology
2017 Volume.40 No. 2 p.303 ~ p.309
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Comparison of 2D and 3D Brachytherapy Planning for Cervical Cancer
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Kim Jung-Hoon
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Abstract
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To evaluate the usefulness of 3-dimensional brachytherapy(BT) planning technique based on CT in cervical cancer. Patients with cervical cancer underwent 2-D BT treatment planning and then CT scan with HDR intracavitary applicators in place with same positions. Dose was prescribed to Point A with 5Gy per fraction on 2-D BT planning. For 3-D BT planning, and dose was prescribed to the High risk CTV for BT (HR CTV) with 5Gy. The 3-D BT planning goal was to cover at least 90% of the HR CTV with target 5Gy isodose surface while limiting the dose to 2 cm3 of bladder to less than 7.5 Gy, and 2cm3 of rectum to less than 5Gy. In one patient of 10 patients, D2cm3 of rectal dose was over 5Gy and 6patients at D2cm3
of bladder dose on 2-D BT planning. There was a tendency to underestimate ICRU bladder dose than ICRU rectal dose. CT based 3-D BT planning for cervical cancer will enable evaluation of dose distributions for tumor and critical organs at risk. So, rectal and bladder morbidity as well as geographic miss will be reduced in case of the bulky disease or uterine malposition.
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KEYWORD
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Cervical Cancer , Intracavitary radiation , 3D brachytherapy planning
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