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The effect of gantry angle on megavoltage photon beam attenuation by a carbon fiber couch insert
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10.1118/1.1852792
/content/aapm/journal/medphys/32/2/10.1118/1.1852792
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/32/2/10.1118/1.1852792

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of experimental configuration.

Image of FIG. 2.
FIG. 2.

Ratio of measurements without to with carbon fiber in the beam expressed as a function of angle of incidence for values measured experimentally and predicted theoretically.

Image of FIG. 3.
FIG. 3.

Axial CT scan of the carbon fiber couch insert with signal intensity profile positions.

Image of FIG. 4.
FIG. 4.

Average of ten signal intensity profiles taken at three positions across the couch insert in the axial CT scan.

Image of FIG. 5.
FIG. 5.

Dose plan for a sarcoma patient at Cookridge Hospital, using the posterior oblique field through the carbon fiber couch insert, gantry angle .

Image of FIG. 6.
FIG. 6.

The problem of potential overdose to tissue that is irradiated by the unattenuated field with the application of a correction factor.

Tables

Generic image for table
TABLE I.

Attenuation correction factors for the replicated clinical example with lateral couch insert displacements, where denotes a shift away from the gantry and denotes a shift towards the gantry.

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/content/aapm/journal/medphys/32/2/10.1118/1.1852792
2005-01-26
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The effect of gantry angle on megavoltage photon beam attenuation by a carbon fiber couch insert
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/32/2/10.1118/1.1852792
10.1118/1.1852792
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