The TMRs are essentially identical to those of comparable-size circular collimators. Results: MMLC fields using 3, 5, 7, 9, 11, and 13 leaves on each side of the Radionics MMLC were created to approximate circular fields. ![]() ![]() Treatment plans were completed and evaluated using both the MMLC ‘circular’ fields and the circular collimators. The MMLC data were input to the XKnife Treatment Planning System. These were compared to the Radionics circular collimators traditionally used for radiosurgery. ![]() Beam data, including tissue maximum ratios, output factors, penumbrae and isodose distributions of these fields were measured. Materials and Methods: ‘Circular’ fields were created with the Radionics MMLC (leaf width 3.53 mm at isocenter). Purpose: To evaluate the miniature multileaf collimator (MMLC) as an alternative to traditional circular collimators for radiosurgery.
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