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Comparison of film dosimetry techniques used for quality assurance of intensity modulated radiation therapy
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10.1118/1.3395574
/content/aapm/journal/medphys/37/6/10.1118/1.3395574
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/6/10.1118/1.3395574

Figures

Image of FIG. 1.
FIG. 1.

Schematic geometry of beam delivery. The film was sandwiched at the center of a solid water phantom. The phantom was exposed to radiation from the lateral side.

Image of FIG. 2.
FIG. 2.

Two-dimensional dose distributions. Grey scale represents the dose level (black: Low dose area; white: High dose area). (a) Two PDD curves were obtained and compared along the two dashed vertical lines, line numbers 1 and 2. (b) Three lateral profiles were measured at depths of 5, 10, and 15 cm, as indicated by the dashed horizontal lines.

Image of FIG. 3.
FIG. 3.

Depth dose and lateral profiles of film, ionization chamber, and MC calculations. Depth dose (a) along line 1 and (b) along line 2. Lateral profiles measured at a depth of (c) 5 and (d) 15 cm. “CA24” indicates ion-chamber array data.

Image of FIG. 4.
FIG. 4.

Comparisons of EDR2 film measurements without filters with MC calculations in two dimensions. (a) Gamma-index field. The red-colored (electronic version) or gray-colored (print version) region indicates that the gamma index is greater than 1 for 2%/2 mm criterion. (b) Isodose lines (solid line: EDR2 film data; dashed line: MC calculations).

Image of FIG. 5.
FIG. 5.

Comparisons of EDR2 film measurements with filters and MC calculations in two dimensions. (a) Gamma-index field. Red-colored region (electronic version) or gray-colored (print version) indicates that the gamma index is greater than 1 for 2%/2 mm criterion. (b) Isodose line (solid line: EDR2 film data; dashed line: MC calculations) comparisons.

Image of FIG. 6.
FIG. 6.

Comparisons of GafChromic®EBT film measurements with MC calculations in two dimensions. (a) Gamma-index field. The red-colored (electronic version) or gray-colored (print version) region indicates that gamma index is greater than 1 for 2%/2 mm criterion. (b) Isodose lines (solid line: EDR2 film data; dashed line: MC calculations).

Tables

Generic image for table
TABLE I.

Beam exposure conditions, collimator positions, and MUs.

Generic image for table
TABLE II.

Comparison of doses measured by ionization chamber (IC), films, and computed by MC along lines 1 and 2, depicted in Fig. 2. Percentage .

Generic image for table
TABLE III.

Gamma index statistics for the comparison of film measurements and MC predictions.

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/content/aapm/journal/medphys/37/6/10.1118/1.3395574
2010-05-25
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comparison of film dosimetry techniques used for quality assurance of intensity modulated radiation therapy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/6/10.1118/1.3395574
10.1118/1.3395574
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