Establishing tumour tracking accuracy in free-breathing respiratory gated SBRT of lung cancer

17th International Conference on the Use of Computers in Radiation Therapy

物理学;计算机科学

Wen, Chuan-Dong^1 ; Wong, C.^1 ; Ackerly, T.^1 ; Ruben, J.^1 ; Millar, J.^1

William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne, VIC 3004, Australia^1

关键词: Clinical conditions;    Fiducial marker;    Free breathing;    Gate widths;    Implanted markers;    Lung Cancer;    Tissue-equivalent materials;    Tracking accuracy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/489/1/012041/pdf
DOI  :  10.1088/1742-6596/489/1/012041

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Free-breathing respiratory gated SBRT of surgically inoperable lung cancer has been clinically commissioned. This study was to establish the tumour tracking accuracy under clinical conditions based on an implanted fiducial marker. A VisicoilTMmarker embedded in tissue-equivalent material mounted in a phantom (ET Gating PhantomTMBrainlab) driven by a patient's breathing data was treated with the ExacTracTMsystem. This one-dimensional moving marker represented a tumour motion in superior-inferior (S-I) direction measured through 4DCT study of the same patient. Both GafchromicTMfilms and the stereoscopic kV images were used for tracking the position of the marker. For tumour motion at magnitudes of 10, 20 and 29 mm and treated with corresponding gate widths of 50%, 33% and 20% of free breathing amplitude, the implanted marker was able to be tracked with a deviation ≤1.53 mm to its planned position.