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Secondary neutron spectra from modern Varian, Siemens, and Elekta linacs with multileaf collimators
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10.1118/1.3159300
/content/aapm/journal/medphys/36/9/10.1118/1.3159300
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/9/10.1118/1.3159300

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the measurement location: All measurements were performed in the patient plane at a source-to-axis distance of and at a point away from the gantry isocenter (in the inferior direction along the treatment couch).

Image of FIG. 2.
FIG. 2.

Response matrix (calculated using MCNP5) for the -based Bonner sphere system. Responses are shown as a function of energy in units of for the 2, 3, 5, 8, 10, and Bonner spheres.

Image of FIG. 3.
FIG. 3.

Comparison of the starting spectrum and the final solution spectrum for the Varian linac.

Image of FIG. 4.
FIG. 4.

An example of the consistency results that are carried out for all MAXED solution spectra for the Varian linac; ratios of the measured counts and the calculated counts for Bonner sphere, .

Image of FIG. 5.
FIG. 5.

Measured photoneutron spectra for Varian 21EX, Elekta Precise, and Siemens ONCOR linacs with a nominal photon beam energy and jaws and MLC closed.

Image of FIG. 6.
FIG. 6.

Measured photoneutron spectra for Varian 21EX, Elekta Precise, and Siemens ONCOR linacs with an nominal photon beam energy and jaws and MLC closed.

Image of FIG. 7.
FIG. 7.

Measured photoneutron spectra for Varian 21EX linacs with nominal photon beam energies of 15, 18, and and the upper and lower jaws and MLC closed.

Image of FIG. 8.
FIG. 8.

Measured photoneutron spectra for Elekta Precise linacs with nominal photon beam energies of 15 and and the upper jaws and MLC closed.

Image of FIG. 9.
FIG. 9.

Measured photoneutron spectra for Siemens ONCOR linacs with nominal photon beam energies of 15 and and the lower jaws and MLC closed.

Tables

Generic image for table
TABLE I.

Irradiation parameters.

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TABLE II.

Parameters calculated from photoneutron spectra for the Varian 21EX, Elekta Precise, and Siemens ONCOR linacs for all photon beam energies investigated in this study. Total uncertainties are shown on the right as percentages.

Generic image for table
TABLE III.

Neutron source strength calculated for the linacs and photon beam energies investigated in this study.

Generic image for table
TABLE IV.

Measured photoneutron data from the current study and previously reported measured and Monte Carlo calculated data for Varian linacs with 15, 18, and photon beam energies.

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/content/aapm/journal/medphys/36/9/10.1118/1.3159300
2009-08-12
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Secondary neutron spectra from modern Varian, Siemens, and Elekta linacs with multileaf collimators
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/9/10.1118/1.3159300
10.1118/1.3159300
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