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Reference dosimetry condition and beam quality correction factor for CyberKnife beam
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10.1118/1.2978228
/content/aapm/journal/medphys/35/10/10.1118/1.2978228
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/10/10.1118/1.2978228

Figures

Image of FIG. 1.
FIG. 1.

A comparison of the 1% flat widths at of depth in water between the CyberKnife and an ordinary linac (Clinac 21EX, Varian ME). The SCD is for the CyberKnife and for the linac.

Image of FIG. 2.
FIG. 2.

The error of dosimeter reading (%) as a function of cavity length of ionization chamber and field . The cavity radius is calculated in , and these values are for a SCD of at a depth of in water.

Image of FIG. 3.
FIG. 3.

The variance between the simulated and measured PDD [60.3% of ] as function of the energy of incident electrons.

Image of FIG. 4.
FIG. 4.

A comparison between the measured and calculated PDD in water for an SSD and relative deviations from a measured PDD as a function of depth in water for a field diameter of (a) 6.0 and (b) .

Image of FIG. 5.
FIG. 5.

A comparison between the measured and the calculated OAR at depth of (a) 5 and (b) for a SSD of and a field of diameter.

Image of FIG. 6.
FIG. 6.

A comparison of the photon energy spectrum between the CyberKnife and an ordinary linac at phantom surface. (Field is for CyberKnife and for the linac).

Image of FIG. 7.
FIG. 7.

The beam quality correction factor in the CyberKnife beam as a function of (a) depth in water for a cone and (b) a field diameter at a depth of .

Tables

Generic image for table
TABLE I.

Reference conditions for determination of absorbed dose to water in CyberKnife beam.

Generic image for table
TABLE II.

Spencer–Attix stopping power ratios and the mean mass energy-absorption coefficient ratios as a function of for a field diameter of and at a depth of in water.

Generic image for table
TABLE III.

Beam quality correction factor as a function of the beam quality index and .

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/content/aapm/journal/medphys/35/10/10.1118/1.2978228
2008-09-19
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reference dosimetry condition and beam quality correction factor for CyberKnife beam
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/10/10.1118/1.2978228
10.1118/1.2978228
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