Dosimetric characteristics of dual-layer multileaf collimation for small-field and intensity-modulated radiation therapy applications.

Journal of Applied Clinical Medical Physics
Y LiuNiko Papanikolaou

Abstract

The purpose of the present work was to measure the performance characteristics in the penumbra region and on the leaf-end of an innovative dual-layer micro multileaf collimator (DmMLC). The DmMLC consists of two orthogonal (upper and lower) layers of leaves; a standard MLC consists of one layer. The DmMLC provides unique performance characteristics in smoothing dose undulation, reducing leaf-end transmission, and reducing MLC field dependence of the leaf stepping angle. Two standard MLCs (80-leaf and 120-leaf versions: Varian Medical Systems, Palo Alto, CA), a DmMLC (AccuKnife: Initia Medical Technology, Canton, MA), and a Cerrobend (Cerro Metal Products, Bellefonte, PA) block were used in performance studies involving a triangular field, a cross leaf-end field, and a circular field. Measurements were made with 6-MV X-rays and extended dose range film at a depth of 5 cm in Solid Water (Gammex rmi, Middleton, WI) at a source-axis distance of 100 cm. The field penumbra width measured between the 20% and 80% isodose lines through the MLC-80, MLC-120, DmMLC, and Cerrobend block were 9.0, 5.0, 3.0, and 2.0 mm respectively. The dose undulation amplitude of the 50% isodose line was measured as 5.5, 2.0, and 0.5 mm for the MLC-80, MLC-...Continue Reading

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Citations

Dec 24, 2019·Nihon Hoshasen Gijutsu Gakkai zasshi·Takahide HayakawaRyuta Sasamoto
Jul 12, 2019·Journal of Applied Clinical Medical Physics·Skylar S GayLaurence E Court
Aug 17, 2011·Journal of Applied Clinical Medical Physics·Dayananda Shamurailatpam SharmaMalhotra Heigrujam
Mar 8, 2019·Physics in Medicine and Biology·Qihui LyuKe Sheng

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