What does 4D-CT mean, and how is this technology currently being used?
4D-CT 是什么意思，该技术目前是如何应用的？
Ultimately, 4D-CT scans provide a precise analysis of the tumor movement which enables more accurate radiotherapy planning. In this way, radiation is administered either on the entire area in which the tumor moves, the “motion envelope,” or during specific moments of the respiration cycle (currently under development at Brainlab).
最终，4D-CT 扫描可以精确分析肿瘤移动，从而实现了更精准的放射治疗计划。通过这种方式，可以在肿瘤移动的整个区域（“移动包络”）上或在呼吸周期的特定时刻进行辐射（目前 Brainlab 正在开发）。