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Validation of a virtual source model for Monte Carlo dose calculations of a flattening filter free linac
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10.1118/1.4709601
/content/aapm/journal/medphys/39/6/10.1118/1.4709601
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/6/10.1118/1.4709601

Figures

Image of FIG. 1.
FIG. 1.

(a) Absolute output factors as a function of field size for FFF and conventional 6 MV beams as predicted by the TPS compared to measurement. (b) Difference in output factors, calculated minus measured.

Image of FIG. 2.
FIG. 2.

Sample beam data: (a) PDD curve for 2 × 2 cm2 field, (b) cross-profiles for a 30 × 30 cm2 field for the FFF model.

Image of FIG. 3.
FIG. 3.

Absolute dose difference between measured and calculated depth doses curves (100 cm source-surface distance) for the field sizes indicated for (a) FFF and (b) FF beams. Monte Carlo variance is set at 0.5%.

Image of FIG. 4.
FIG. 4.

Comparison of calculated vs measured beam profiles for sample field sizes of (a) 2 × 2 cm2, (b) 5 × 5 cm2, (c) 10 × 10 cm2, (d) 15 × 15 cm2, (e) 20 × 20 cm2, and (f) 30 × 30 cm2 at 100 cm SSD and a depth of 5 cm. Criteria for gamma analysis are 2%/2 mm.

Image of FIG. 5.
FIG. 5.

Beam setup for IMRT planning of a head and neck case showing sagittal and coronal color-wash maps (a) and dose volume histogram (b). The FFF beam is displayed as the dotted line, 6 MV solid.

Tables

Generic image for table
TABLE I.

Number of segments and monitor units needed for each treatment plan and the relative increase in each necessary to deliver the FFF plans.

Generic image for table
TABLE II.

Gamma analysis and absolute dose difference of individual beams for the IMRT plans. Percentage of points passing gamma analysis (γ < 1) at 3%/3 mm and 2%/2 mm for the individual beams of each plan.

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/content/aapm/journal/medphys/39/6/10.1118/1.4709601
2012-05-22
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Validation of a virtual source model for Monte Carlo dose calculations of a flattening filter free linac
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/6/10.1118/1.4709601
10.1118/1.4709601
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