螺旋断层放疗中重复绘画（REPEAT）照射。
Repetitive Painting (REPEAT) Irradiation in Stereotactic Radiotherapy Using Helical Tomotherapy.
机构信息
Department of Radiation Oncology, Saku Central Hospital Advanced Care Center, Nagano, Japan;
Department of Radiation Oncology, Saku Central Hospital Advanced Care Center, Nagano, Japan.
出版信息
In Vivo. 2022 Jan-Feb;36(1):330-335. doi: 10.21873/invivo.12706.
BACKGROUND/AIM: Stereotactic radiotherapy (SRT) for spine metastases with helical tomotherapy requires a long irradiation time due to the high dose per fraction. Since helical tomotherapy can neither confirm nor correct the position during irradiation, a plan with a long irradiation time cannot be used in actual clinical practice, given the intra-fractional motion error. To address this problem, we devised a method called REPEAT irradiation.
PATIENTS AND METHODS
REPEtitive pAinTing (REPEAT) irradiation is a method of dividing the irradiation for a given fraction per day into several sessions and performing the irradiation after position correction using mega-voltage computed tomography images for each session. In order to evaluate how REPEAT irradiation changes irradiation time and the dose-volume histogram (DVH), a planning study with helical tomotherapy was conducted using CT images of a patient with lumbar spine metastasis.
RESULTS
In this case, we found that dividing 3 irradiation fractions into 3 sessions per day (i.e., 9 fractions=9 sessions in 3 days) using REPEAT irradiation shortened the irradiation time per session and simultaneously improved dose-volume histogram parameters.
CONCLUSION
Although the optimal number of sessions may differ depending on the patient's condition, the fixing method, the irradiation site, and the calculation parameters, REPEAT irradiation does not require any special equipment and is a simple practical treatment method.
背景/目的：脊柱转移瘤的立体定向放疗（SRT）由于每个分次的剂量较高，因此需要较长的照射时间。由于螺旋断层放疗在照射过程中既不能确认也不能纠正位置，因此考虑到分次内运动误差，长照射时间的计划在实际临床实践中无法使用。为了解决这个问题，我们设计了一种称为重复照射（REPEAT）的方法。
患者和方法
重复Painting（REPEAT）照射是一种将每天给定分次的照射分成几个部分，并在每个部分使用兆伏 CT 图像进行位置校正后进行照射的方法。为了评估重复照射如何改变照射时间和剂量体积直方图（DVH），我们使用腰椎转移瘤患者的 CT 图像进行了螺旋断层放疗的计划研究。
结果
在这种情况下，我们发现通过重复照射将 3 个照射分次分为每天 3 次（即 9 个分次=3 天 9 次）可以缩短每次照射的时间，同时改善剂量体积直方图参数。
结论
尽管最佳的分次次数可能因患者的情况、固定方法、照射部位和计算参数而异，但重复照射不需要任何特殊设备，是一种简单实用的治疗方法。
Zotero 插件