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Unintended attenuation in the Leksell Gamma Knife® Perfexion™ calibration-phantom adaptor and its effect on dose calibration
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10.1118/1.3093240
/content/aapm/journal/medphys/36/4/10.1118/1.3093240
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/4/10.1118/1.3093240

Figures

Image of FIG. 1.
FIG. 1.

Phantoms and adaptors used for LGK PFX calibration. Elekta Instrument AB polystyrene phantom with phantom adaptor (a). Elekta Instrument AB solid-water phantom with frame adaptor (b). Radiograph of the polystyrene phantom setup in the adaptor, approximate beam directions from sectors 3 and 7 are indicated (c).

Image of FIG. 2.
FIG. 2.

Film setup for the demonstration of the absorption of 16, 8, and 4 mm beams by the phantom adaptor (a). Results for sectors 3 and 7 are shown in (b) and (c). Attenuation by Lucite gamma angle plate is shown in (d).

Tables

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TABLE I.

Sector output uniformity measurement for 16 mm collimator with standard Elekta Instrument AB polystyrene phantom and Elekta Instrument AB solid-water phantom with their individual phantom adaptors. Average readings together with 1 standard deviation are given in the table. While for solid-water phantom, individual sector output is consistent within 1.0%, the sector output for polystyrene phantom and C-clamp aluminum adaptor for sectors 3 and 7 is smaller. Percentage deviations of each sector output from the average output of all eight sectors were calculated by using Eqs. (1) and (2). Percentage deviations for sectors 3 and 7 attenuated readings from the average unattenuated sectors reading were calculated by Eqs. (3) and (4) and are given in parentheses in the case of polystyrene phantom.

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/content/aapm/journal/medphys/36/4/10.1118/1.3093240
2009-03-16
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unintended attenuation in the Leksell Gamma Knife® Perfexion™ calibration-phantom adaptor and its effect on dose calibration
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/4/10.1118/1.3093240
10.1118/1.3093240
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