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

Wen Chuang-Dong, C Wong, T Ackerly, J Ruben, J Millar

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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 VisicoilTM marker embedded in tissue-equivalent material mounted in a phantom (ET Gating PhantomTM Brainlab) driven by a patient's breathing data was treated with the ExacTracTM system. This one-dimensional moving marker represented a tumour motion in superior-inferior (S-I) direction measured through 4DCT study of the same patient. Both GafchromicTM films 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. © Published under licence by IOP Publishing Ltd.

Original languageEnglish
Article number012041
Number of pages5
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2014
EventXVII International Conference on the Use of Computers in Radiation Therapy - Melbourne Convention and Exhibition Centre, Melbourne, Australia
Duration: 6 May 20139 May 2013
Conference number: 17

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