Chang Zheng, Wang Zhiheng, Wu Q Jackie, Yan Hui, Bowsher Jim, Zhang Junan, Yin Fang-Fang
Department of Radiation Oncology, Duke University, Box 3295, Duke University Medical Center, Durham, North Carolina 27710, USA.
Med Phys. 2008 Oct;35(10):4460-3. doi: 10.1118/1.2977668.
A new Novalis Tx system equipped with a high definition multileaf collimator (HDMLC) recently became available to perform both image-guided radiosurgery and conventional radiotherapy. It is capable of delivering a highly conformal radiation dose with three energy modes: 6 MV photon energy, 15 MV photon energy, and 6 MV photon energy in a stereotactic radiosurgery mode with 1000 MU/min dose rate. Dosimetric characteristics of the new Novalis Tx treatment unit with the HDMLC are systematically measured for commissioning. A high resolution diode detector and miniion-chamber detector are used to measure dosimetric data for a range of field sizes from 4 x 4 mm to 400 x 400 mm. The commissioned Novalis Tx system has passed the RPC stereotactic radiosurgery head phantom irradiation test. The Novalis Tx system not only expands its capabilities with three energy modes, but also achieves better beam conformity and sharer beam penumbra with HDMLC. Since there is little beam data information available for the new Novalis Tx system, we present in this work the dosimetric data of the new modality for reference and comparison.
一种配备高清多叶准直器（HDMLC）的新型诺瓦利斯Tx系统最近开始用于实施图像引导放射外科手术和传统放射治疗。它能够通过三种能量模式提供高度适形的辐射剂量：6兆伏光子能量、15兆伏光子能量以及在立体定向放射外科手术模式下剂量率为1000MU/分钟的6兆伏光子能量。为了调试，系统地测量了配备HDMLC的新型诺瓦利斯Tx治疗单元的剂量学特征。使用高分辨率二极管探测器和微型电离室探测器来测量从4×4毫米到400×400毫米一系列射野尺寸的剂量学数据。已调试的诺瓦利斯Tx系统通过了RPC立体定向放射外科手术头部体模照射测试。诺瓦利斯Tx系统不仅通过三种能量模式扩展了其功能，还通过HDMLC实现了更好的射束适形性和更窄的射束半影。由于新型诺瓦利斯Tx系统的射束数据信息很少，我们在这项工作中给出这种新模态的剂量学数据以供参考和比较。
