The starburst shot is a new, effective technique for detailed Gamma Knife isocenter QA, providing a comprehensive analysis of all 192 beams. It successfully verifies the isocenter's position and size with submillimeter accuracy. The starburst shot differs significantly from standard techniques, such as the pinprick tool test, and we propose a tiered system of acceptable p 0. 5 {p₀. ₅} values of 0. 90 for 4 mm, 0. 80 for 8 mm, and 0. 70 for 16 mm, as a QA standard for clinical use.
Corns et al. (Wed,) studied this question.