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Stereotactic dose planning system used in Leksell Gamma Knife model-B: EGS4 Monte Carlo versus GafChromic films MD-55 by Y.C. Cheung; K.N. Yu; R.T.K. Ho; C.P. Yu is a Physics and Astronomy article available to read on EtoBox.

What is Stereotactic dose planning system used in Leksell Gamma Knife model-B: EGS4 Monte Carlo versus GafChromic films MD-55 about?

The accuracy of the dose planning system (Leksell GammaPlan) used in Gamma Knife (model-B) radiosurgery was veri®ed using both the GafChromic ®lms MD-55 (improved) and the EGS4 Monte Carlo technique. The Monte Carlo technique was employed to calculate the dose distribution along the x-, y-and z-axes when a single shot with opening of all 201 sources was delivered at the centre of a simulated water phantom with a diameter of 160 mm. Collimator helmets with dierent size of the Gamma Knife unit were veri®ed. Good consistency (typical discrepancy less than 2%) was obtained between the results of Monte Carlo and GammaPlan. Small discrepancies, however, were obtained by GafChromic ®lms. Discrepancies, as great as 10% when using the 4 mm collimator helmet, at the low percentage isodose curve along the z-axis of the measurement results were probably due to the small energy dependency of the GafChromic ®lms. Signi®cant discrepancies were not observed along x-and y-axes because such small discrepancies were easily over-washed by other gamma beams coming from the x-and y-directions. Similar results showing the discrepancies between the GafChromic ®lms and GammaPlan were obtained when using th

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Author

Y.C. Cheung; K.N. Yu; R.T.K. Ho; C.P. Yu

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0969-8043)

Published

2000

Language

EN

Field

Physics and Astronomy (Physical Sciences)