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Item Metadata only Comparative penumbral widths for small fields of 6 MV photon beam(Mahidol University. Mahidol University Library and Knowledge Center, 2014) Sukesorn Panyawong; Puangpen Tangboonduangjit; Lalida Tuntipumiamorn(EDR2 and EBT2) were used as a reference penumbral width measurement for comparison.AVidar scanner and the ImageJ software were used for film scanning analysis at resolution of 0.36 mm/pixel (71 DPI). The film calibration curves were fitted using a...อ้างอิงในการเปรียบเทียบบริเวณขอบพื้นที่รังสี Vidar scanner และ imageJ software ใช้ในการประมวลผลด้วยความละเอียด 0.36 มิลลิเมตรต่อพิกเซลและใช้สมการ polynomial กำลังสองในการสร้างcalibration curvesของฟิล์ม ค่าต่ำสุดและสูงสุดของบริเวณขอบพื้นที่รังสีที่วัดด้วยItem Metadata only Planning target volume (PTV) margin determination from Marker-based and the Exactrac 6D X-Ray IGRT system in prostate cancer patients(Mahidol University. Mahidol University Library and Knowledge Center, 2018) Siwadol Pleanarom; Lalida Tuntipumiamorn; Pittaya Dankulchai, 936 stereoscopic x-ray images and 271 cone beam computed tomography (CBCT) images from the On-Board Imager system were obtained for the analysis. Data of the setup deviations from three setup techniques, including initial laser setting up, marker...Modern technology, such as intensity modulated and image-guided radiation therapy, have revolutionized radiation treatment with improved outcome and reduced toxicity. However, radiotherapy is a complex process and potential errors can occur in each