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• W2775598869 abstract "A small circular field used in stereotactic radiosurgery (SRS) is obtained using a cone accessory attached to a LINAC. Such beam modification requires that the LINAC jaws be set to a specific size must be explicitly made by the LINAC operator. Given that treatment planning systems are commissioned with correct jaw settings, it is difficult to quantify the leakage dose to the patient when the jaw setting is larger than recommended. There are documented cases indicating that the resulting overexposure can lead to long-term disability and death. This study quantifies the dose differences between correct and incorrect jaw settings by simulating a realistic treatment plan using a LINAC with a circular cone accessory. Calculations were based on a realistic treatment plan for right side trigeminal neuralgia delivering 90 Gy using a 6 MV (4 mm cone) beam with 7 arcs. The calculated doses to target and normal tissue with jaws set correctly (5×5 cm2) and incorrectly (settings ranging from 10×10 cm2 to 20×20 cm2) were then compared. Incorrect jaw settings resulted in an increase in the target dose of less than 6%. This implies that pre-treatment QA based only on point dose measurements at the isocenter will not detect jaw setting errors. However, extremely high doses (g 25 Gy) occurred 5 cm away from the isocenter. For example, dose to 50% of the volume, D50, in the eyes increased from 15 cGy with the correct jaw setting to 5318 cGy with an incorrect jaw setting of 20×20 cm2. D50 in the brain increased from 27 cGy with the correct jaw setting to 4335 cGy for a setting of 20×20 cm2. The leakage radiation is shown to originate beyond the outer edge of the beam limiting cone (outer radius=5 cm). Leakage dose can reach 15%, 40%, and 60% of target dose when incorrect jaw settings of 10×10 cm2, 15×15 cm2 and 20×20 cm2 are used in the beam delivery." @default.
• W2775598869 created "2017-12-22" @default.
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• W2775598869 date "2018-01-23" @default.
• W2775598869 modified "2023-10-13" @default.
• W2775598869 title "Dosimetric effects of incorrect jaw settings in cranial radiosurgery" @default.
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• W2775598869 doi "https://doi.org/10.1088/2057-1976/aaa162" @default.
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