Phantoms used for dose measurement, in transversal view, with arrows indicating the measuring plane. (a) and (c) are two different homogeneous polystyrene phantoms. (b) is a heterogeneous phantom consisting of 3 cm of polystyrene at the top and bottom, with 6 cm of cork in the middle. (d) and (e) are lung phantoms without and with a polystyrene sphere, representing a tumor.
Typical RapidArc MLC setting, consisting of single leaf blocking/opening and several small effective fields.
Comparison between measurements and calculations using AAA8 and AAA10 with calculation grids of 2.5 and 1 mm. (a) and (b) show the dose deviations between measurements and calculations in polystyrene and cork. (c) and (d) show the calculated and measured penumbra width for small square fields.
Measured and calculated dose profile for the two open HD-MLC leaves separated by one closed leaf.
Measured and calculated dose profiles for 2 arc with total monitor units of 372 (left) and 668 (right), respectively.
Measured and calculated dose profiles for the clinical meningioma RapidArc plan in a homogenous polystyrene phantom.
Gamma evaluation of measured and calculated dose distribution carried out in cork with a polystyrene sphere. Both calculations were performed with 2.5 mm grid. The black solid line represents the outline of the sphere.
Gamma analysis of plans with different number of monitor units. Percentages of gamma >1 within the region of interest listed were averaged for two arcs, (one counter-clockwise and one clockwise arc per plan), for two patients.
Gamma analysis of the clinical meningioma RapidArc plan.
Gamma analysis for plans measured and calculated in different media. Percentages of gamma >1 and average dose difference within the region of interest between measurements and calculations were listed.
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