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Total scatter factors of small beams: A multidetector and Monte Carlo study
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10.1118/1.2828195
/content/aapm/journal/medphys/35/2/10.1118/1.2828195
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/2/10.1118/1.2828195

Figures

Image of FIG. 1.
FIG. 1.

Schematic of a Cyberknife treatment head. Components are not to scale, but relevant dimensions and materials are reported.

Image of FIG. 2.
FIG. 2.

Flowchart of the actions required to use the data reported in this article to determine of a Cyberknife system different from the unit investigated in this study. Note that no further Monte Carlo simulation is required. The detector shall be of the same type as one of the microchambers or the diode employed in this study.

Image of FIG. 3.
FIG. 3.

(a) and (b) Half-profiles at 1.5 cm depth and of the 5 mm diameter collimator (a) and 60 mm diam collimator (b). A comparison between measured profiles (dotted line) and calculated by MC (continuous line) is shown.

Image of FIG. 4.
FIG. 4.

Correction factors as a function of true Monte Carlo : dotted lines are the linear fit of the calculated pairs, continuous lines are the curves whose slope is the inverse of the measured , the symbols identify Monte Carlo calculated pairs for the four detectors, and the asterisks represent the intersections between the continuous and the dotted curves for each detector, corresponding to the estimated and .

Image of FIG. 5.
FIG. 5.

True Monte Carlo as a function of the FWHM: the estimated allows the FWHM of the electron beam to be estimated for the Cyberknife system under investigation.

Tables

Generic image for table
TABLE I.

Characteristics of the detectors used for measurement of total scatter factors.

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TABLE II.

TPRs measured and calculated for three different energies and for the 5 and 60 mm collimators.

Generic image for table
TABLE III.

Estimated values of and for the 5, 7.5,, and 10 mm collimators, for the four detectors.

Generic image for table
TABLE IV.

Measured and MC-simulated , for the four detectors and for the 5, 7.5, and 10 mm collimators, for the various FWHM of the Gaussian spatial distribution of the electron source.

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TABLE V.

Raw measurements and estimated values of for the 5, 7.5, and 10 mm collimators.

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TABLE VI.

Monte Carlo calculated for 6.5, 7.0, and 7.5 MeV and for the four values of the FWHM.

Generic image for table
TABLE VII.

of the four detectors for the 5, 7.5, and 10 mm collimators, as a function of the FWHM.

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/content/aapm/journal/medphys/35/2/10.1118/1.2828195
2008-01-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Total scatter factors of small beams: A multidetector and Monte Carlo study
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/2/10.1118/1.2828195
10.1118/1.2828195
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