Tanaka Hidekazu, Ito Masaya, Yamaguchi Takahiro, Hachiya Kae, Yajima Takahiko, Kitahara Masashi, Matsuyama Katsuya, Goshima Satoshi, Futamura Manabu, Matsuo Masayuki
Department of Radiology, Graduate School of Medicine, Gifu University, Gifu, Japan.
Division of Radiation Oncology, Gifu University Hospital, Gifu, Japan.
Breast Cancer (Auckl). 2017 Sep 20;11:1178223417731297. doi: 10.1177/1178223417731297. eCollection 2017.
We evaluated whether the field-in-field (FIF) technique improves the homogeneity of the target in high tangent radiation therapy (HTRT).
This study included 30 patients. In total, 3 HTRT plans were created: 1 with conventional opposed fields (Conv-p), 1 with the FIF technique (FIF-p), and 1 with FIF technique using lung-blocked subfields (FIF-LB-p).
The maximum dose of the breast and planning target volume (PTV) was significantly lower for FIF-p and FIF-LB-p than Conv-p. Homogeneity index of PTV was also significantly lower for FIF-p and FIF-LB-p than Conv-p. Homogeneity index of the breast or PTV was significantly better for FIF-p than FIF-LB-p. The volumes of the breast or the PTV receiving 95% and 90% of the prescribed dose were also significantly better for FIF-p, indicating the advantages of FIF-p.
The FIF technique was useful in HTRT and improved homogeneity in the target.
我们评估了在高切线放疗（HTRT）中，野中野（FIF）技术是否能改善靶区的均匀性。
本研究纳入30例患者。共制定了3个HTRT计划：1个采用传统对穿野（Conv-p），1个采用FIF技术（FIF-p），1个采用使用肺部遮挡子野的FIF技术（FIF-LB-p）。
FIF-p和FIF-LB-p的乳房及计划靶区（PTV）的最大剂量显著低于Conv-p。FIF-p和FIF-LB-p的PTV均匀性指数也显著低于Conv-p。FIF-p的乳房或PTV均匀性指数显著优于FIF-LB-p。FIF-p的乳房或PTV接受95%和90%处方剂量的体积也显著更优，表明FIF-p的优势。
FIF技术在HTRT中有用，并改善了靶区的均匀性。
