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Measurement of changes in linear accelerator photon energy through flatness variation using an ion chamber array
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10.1118/1.4791641
/content/aapm/journal/medphys/40/4/10.1118/1.4791641
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/4/10.1118/1.4791641
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A diagram of the IC Profiler showing the locations of the 251 ion chambers.

Image of FIG. 2.
FIG. 2.

Change in PDD at 5 at 10 cm depth in water (d5, d10) as a function of energy and field size for (a) 6-MV and (b) 18-MV beams. Energy changes were achieved by adjusting the BMI. The error bars are based on measurements of PDD at a single energy.

Image of FIG. 3.
FIG. 3.

Change in the ratio PDD(10)/PDD(5) as a function of energy and field size (FS) for 6- and 18-MV beams. Energy changes were achieved by adjusting the BMI.

Image of FIG. 4.
FIG. 4.

Changes in Flat and F ND as a function of energy for (a) 6-MV and (b) 18-MV beams. Energy changes were achieved by adjusting the BMI. The error bars shown are estimated based on repeat measurements at the nominal energy (6 or 18 MV).

Image of FIG. 5.
FIG. 5.

Changes in PDD, F DN, and Flat with changes in energy, which were achieved by adjusting the BMI. Data are presented for (a) 6-MV and (b) 18-MV beams. The PDD values are those at 10 cm in water for the 3 × 3 and 10 × 10 cm2 fields.

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/content/aapm/journal/medphys/40/4/10.1118/1.4791641
2013-03-12
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurement of changes in linear accelerator photon energy through flatness variation using an ion chamber array
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/4/10.1118/1.4791641
10.1118/1.4791641
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