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Impact of the calculation resolution of AAA for small fields and RapidArc treatment plans
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

Typical RapidArc MLC setting, consisting of single leaf blocking/opening and several small effective fields.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Measured and calculated dose profile for the two open HD-MLC leaves separated by one closed leaf.

Image of FIG. 5.
FIG. 5.

Measured and calculated dose profiles for 2 arc with total monitor units of 372 (left) and 668 (right), respectively.

Image of FIG. 6.
FIG. 6.

Measured and calculated dose profiles for the clinical meningioma RapidArc plan in a homogenous polystyrene phantom.

Image of FIG. 7.
FIG. 7.

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.


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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.

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Gamma analysis of the clinical meningioma RapidArc plan.

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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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Impact of the calculation resolution of AAA for small fields and RapidArc treatment plans