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KMID : 1164220130250020187
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Journal of Korean Society for Radiotherapeutic Technology
2013 Volume.25 No. 2 p.187 ~ p.192
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The Study of Dose Variation and Change of Heart Volume Using 4D-CT in Left Breast Radiation Therapy
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Park Seon-Mi
Chun Keum-Sung
Huh Kyung-Hoon
Shin Sung-Pil
Kim Kwang-Seok
Kim Chang-Uk
Kim Hoi-Nam
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Abstract
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Purpose: We investigate the results of changed heart volume and heart dose in the left breast cancer patients while considering the movements of respiration.
Materials and Methods: During the months of March and May in 2012, we designated the 10 patients who had tangential irradiation with left breast cancer in the department of radiation Oncology. With acquired images of free breathing pattern through 3D and 4D CT, we had planed enough treatment filed for covered up the whole left breast. It compares the results of the exposed dose and the volume of heart by DVH (Dose Volume histogram). Although total dose was 50.4 Gy (1.8 Gy/28 fraction), reirradiated 9 Gy (1.8 Gy/5 Fraction) with PTV (Planning Target Volume) if necessary.
Results: It compares the results of heart volume and heart dose with the free breathing in 3D CT and 4D CT. It represents the maximum difference volume of heart is 40.5%. In addition, it indicated the difference volume of maximum and minimum, average are 8.8% and 27.9%, 37.4% in total absorbed dose of heart.
Conclusion: In case of tangential irradiation (opposite beam) in left breast cancer patients, it is necessary to consider the changed heart volume by the respiration of patient and the heartbeat of patient.
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KEYWORD
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breast cancer, heart volume, heart dose, 4D-CT, free-breathing CT
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