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KMID : 1164220180300010169
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Journal of Korean Society for Radiotherapeutic Technology
2018 Volume.30 No. 1 p.169 ~ p.176
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Evaluation of the possibility of clinical application by surface dose measurement of ViewRay in MFW treatment
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Sun Geo-Jun
Son Sang-Jun
Lee Yang-Hoon
Lee Je-Hee
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Abstract
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Purpose : The purpose of this study is to evaluate clinical applicability of Co-60 ViewRay treatment plan to increase the skin dose in case of high skin dose is required such as Malignant Fungating Wound By measuring the presence / absence of Bolus application and skin dose by the treatment device and comparing it
Materials and Methods : Nine inner measuring points of 2.5 cm lattice arrangement and all 13 measuring points including upper and lower left and right measuring points touching the chest and skin were marked. After CT was taken, each treatment plan was formulated through Eclipse and ViewRay-TPS, and a Fixed beam-IMRT treatment plan was formulated so that the left chest V2Gy = 95 % is delivered. Before measurement QED detector was calibrated and the QED detector was positioned at the 13 measurement points displayed on Phantom and surface dose of each treatment planner was measured using 5 mm Bolus application using True-beam and View-ray before and after, measure three times and compare each before applying 5 mm Bolus.
Results : The surface dose of the Co-60 ViewRay and the linear accelerator appeared at 76.8 %±5.2 % vs. 67.3 %±7.5 % and the surface dose after application of 5 mm Bolus was 87.6 %±8.9 % vs. 80.3 %± It was measured at 10.2 % (p<0.001).
Conclusion : As a result of the surface dose measurement of each treatment instrument, Co-60 ViewRay confirmed that the surface dose reached 95.6 % of 6 MV Linac with conventional 5 mm bolus, despite not using Bolus (p<0.001). Also, by utilizing magnetic resonance images for each treatment, it is possible to observe the change in the treatment site without the problem of exposure, it is easy to formulate an adaptive treatment plan and it is easy to secure the skin dose, so the size In the case of Malignant Fungating Wound patients who need fast skin changes and need high skin doses, Co-60 ViewRay is considered to be more useful than linear accelerators.
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KEYWORD
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ViewRay, LINAC, Surface dose
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