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. 2008 Mar 31;9(2):15–29. doi: 10.1120/jacmp.v9i2.2709

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© 2008 The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Penumbra measurements of $20 % - 80 %$ isodose lines, and the dose undulation amplitude of 50% isodose line, (a) Multileaf collimator (MLC)–80 with 1‐cm leaf width. (b) MLC‐120 with 0.5‐cm leaf width. (c) Dual‐layer micro‐MLC with 0.32‐cm leaf width. (d) Cerrobend (Cerro Metal Products, Bellefonte, PA) blocks.