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Development and characterization of a tissue equivalent plastic scintillator based dosimetry system
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10.1118/1.2140118
/content/aapm/journal/medphys/33/1/10.1118/1.2140118
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/1/10.1118/1.2140118

Figures

Image of FIG. 1.
FIG. 1.

IMRT verification system, (a) phantom outer box with CCD camera capturing light reflected out of viewing window; (b) inner wedge insert with Lucite mirror at to scintillator sheet.

Image of FIG. 2.
FIG. 2.

Central profiles through optimized blurring kernel described in Eq. (6) in the direction (a) and the direction (b).

Image of FIG. 3.
FIG. 3.

Profiles across original, blurred distribution, deblurred distribution, and treatment-planning system (TPS) calculated distribution for an square field showing effects of deconvolution of optimized kernel in the direction (a) and the direction (b).

Image of FIG. 4.
FIG. 4.

Average pixel intensity of the system with respect to field size and dose delivered. The solid line represents a linear fit of the average response of all fields.

Image of FIG. 5.
FIG. 5.

Acquired image field size in pixels with respect to physical field size in centimeters as shaped by collimator jaws. Data is shown for both the and directions.

Image of FIG. 6.
FIG. 6.

Average region-of-interest pixel intensity as a function of time. Data has been normalized such that the average observed response over the 180 day period is equal to unity.

Image of FIG. 7.
FIG. 7.

Calibration curve for converting measured intensity distributions to dose. Data was acquired using square fields and delivering 12 varying MU levels.

Image of FIG. 8.
FIG. 8.

Relative dose distributions for a wedged field in the direction measured using (a) scintillator based verification system and (b) 2D film dosimetry. Crosshairs indicate positions of 1D profiles shown in Fig. 9.

Image of FIG. 9.
FIG. 9.

Profiles across measured relative dose distributions for wedged field in direction for both scintillator based verification system and film dosimetry in (a) direction and (b) direction.

Image of FIG. 10.
FIG. 10.

Relative dose distributions for a wedged field in the direction measured using (a) scintillator based verification system and (b) 2D film dosimetry. Crosshairs indicate positions of 1D profiles shown in Fig. 11.

Image of FIG. 11.
FIG. 11.

Profiles across measured relative dose distributions for wedged field in direction for both scintillator based verification system and film dosimetry in (a) direction and (b) direction.

Tables

Generic image for table
TABLE I.

Important physical properties of the tissue equivalent plastic scintillator detection screen.

Generic image for table
TABLE II.

Dose rate dependence of verification system. Region-of-interest comprised a square centered at the field isocenter. Error values indicate standard deviations over 10 trials at each dose rate.

Generic image for table
TABLE III.

Summary of percent dose difference and gamma factor maps for wedges in the and directions.

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/content/aapm/journal/medphys/33/1/10.1118/1.2140118
2005-12-20
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Development and characterization of a tissue equivalent plastic scintillator based dosimetry system
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/1/10.1118/1.2140118
10.1118/1.2140118
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