英文摘要
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This study compares the conformity of Nasopharyngeal Carcinoma (NPC) patients with newly TomoEDGE technique, in 5-cm and 2.5-cm Fixed and Dynamic jaws of Helical Tomotherapy (TOMO).
Thermoluminescent dosimetry (TLD) were calibrated by 6MV TOMO, then inserted into solid water and Rando phantoms. For precise TLD locations among 3 and 4 slices of Rando phantom, TLDs were first scanned by CT. NPC Treatments were performed by senior radiotherapist.The locations of organ at risk (OAR) and tissues were determined by visually comparing sections to an atlas of cross-sectional anatomy. Equivalent dose (D) and skin dose (Dskin) were also evaluated in each experiment.Radiation doses ware 2.0±0.1 Gy at the tumor center of Rando phantom. Those were effectively reduced to near 10 times using 5-cm Dynamic jaw than 5-cm Fixed jaw at 3 cm away from tumor center of Rando phantom. Extra radiations were found to decreases with tumor center.Results away from TLD-100H approach was suitable for radiation measurements.Extra radiations doses ware 1.27±0.23 Gy using 5-cm Fixed jaw, 9times more than those of 0.14±0.03 Gy using 5-cm Dynamic jaw, 3.6-cm away from center.Radiations doses ware 0.57±0.10 Gy using 2.5-cm Fixed jaw, 4 times more than those of 0.14±0.03 Gy using 2.5-cm Dynamic jaw, 3 cm away from center.
Keywords:Dosimetric conformity, Nasopharyngeal Carcinoma (NPC), Helical Tomotherapy (TOMO), Rando phantom, Thermoluminescent dosimetry, Fixed jaw, Dynamic jaw
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