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KMID : 1164220140260020345
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 2 p.345 ~ p.354
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Evaluation on Usefulness of Stereotactic Radio Surgery using Fraxionⓡ System
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Kim Tae-Won
Park Kwang-Woo
Ha Jin-Sook
Jeon Mi-Jin
Cho Yoon-Jin
Kim Jong-Dae
Shin Dong-Bong
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Abstract
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Purpose : We evaluated the usefulness of Fraxionⓡ system and s-thermoplastic mask by analyzing setup error when
stereotactic radiousurgery (SRS) was treated for brain metastasis.
Materials and Methods : 6 patients who received definite diagnosis as brain metastasis between May 2014 and October
2014 were selected. 3 patients were immobilized s-thermoplastic mask and mouthpiece (group1), while Fraxionⓡ system was used for the other 3 patients (group2). Cone Beam Computerized Tomography (CBCT) scan was acquired to register planning CT scan. The registration offset was compared for each group. We compared and reported the errors using maximum, minimum, mean, and standard deviation of registration offsets. Furthermore, We used the same method as patient specific quality assurance to verify absorbed dose of PTV.
Results : The setup error which is registration offset was reduced 83% in x, 40% in y, and 92% in z-direction when Fraxionⓡ system was used compared to the case of using s-thermoplastic mask and mouthpiece. In addition, using Fraxionⓡ system showed improved results in rotational components, pitch (rotation along x-axis), roll (y), and yaw (z) which were reduced 64, 88, and 87% respectively compared to the case of using s-thermoplastic mask and mouthpiece. In dosimetry results, when sthermoplastic mask and mouthpiece used, absorbed dose was reduce 83% compared to before and after registration. However, using Fraxionⓡ system showed only 1.9%. All percentage were calculated with respect to average value.
Conclusion : Using Fraxionⓡ system including mouthpiece, Fraxion frame, frontpiece, and thermoplastic mask, showed better repeatability and precision compared to using s-thermoplastic mask and mouthpiece, which is consequently considered as more improved immobilization system.
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KEYWORD
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Fraxionⓡ system, stereotactic radiousurgery(SRS), Setup Error
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