Kim Michele M, Kennedy Chris, Scheuermann Ryan, Freedman Gary, Li Taoran
Radiation Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA.
Cureus. 2019 May 24;11(5):e4744. doi: 10.7759/cureus.4744.
The Halcyon is a newly introduced platform to provide a simplified high-throughput workflow. A substantial fraction of patients treated with radiation are receiving breast irradiation. The Halcyon has a smaller maximum field size (28 x 28 cm) compared to traditional C-arm linacs, limiting treatment of larger breast fields. With the use of autofeathering and linked multiple isocenters, non-divergent beams can be used to treat whole breast with large mid-tangent separation. In this case report, a multiple isocenter whole breast treatment with nodal involvement is described with the Halcyon 2.0 platform. The patient was simulated with the same immobilization techniques as used for C-arm linac treatments. The treatment planning time was around 20-30 minutes, which is similar to traditional planning for C-arm linacs, and dosimetric analysis resulted in satisfactory dose-volume histogram (DVH) parameters that met all planning objectives. Treatment times were shorter with an average of 9:32 minutes from the beginning of imaging to the end of treatment and a total in-room time of around 15 minutes per fraction. The use of multiple isocenters for the extended treatment field created a half-beam block type field arrangement, which has been previously reported to produce superior dosimetry results at the supraclavicular-tangents junction area.
Halcyon是一个新推出的平台，旨在提供简化的高通量工作流程。接受放射治疗的患者中有很大一部分正在接受乳腺照射。与传统的C型臂直线加速器相比，Halcyon的最大射野尺寸较小（28×28 cm），限制了对较大乳腺射野的治疗。通过使用自动羽化和连接多个等中心，可以使用非发散束来治疗具有大的中间切线间距的全乳。在本病例报告中，描述了使用Halcyon 2.0平台对伴有淋巴结受累的全乳进行多等中心治疗的情况。该患者采用了与C型臂直线加速器治疗相同的固定技术进行模拟。治疗计划时间约为20 - 30分钟，这与传统的C型臂直线加速器计划相似，剂量分析得出的剂量体积直方图（DVH）参数令人满意，满足了所有计划目标。治疗时间较短，从成像开始到治疗结束平均为9分32秒，每次分割的总室内时间约为15分钟。使用多个等中心进行扩展治疗射野产生了半束遮挡型射野布置方式，此前已有报道称这种方式在锁骨上 - 切线交界区域能产生更好的剂量学结果。
