1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Assessment of the setup dependence of detector response functions for mega-voltage linear accelerators
Rent:
Rent this article for
USD
10.1118/1.3284529
/content/aapm/journal/medphys/37/2/10.1118/1.3284529
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/2/10.1118/1.3284529

Figures

Image of FIG. 1.
FIG. 1.

Edge detector cross-plane profile measurement obtained for a 90 cm SSD and a detector point of measurement of 15 cm depth. The measured raw data (circle) and data fit (solid) are shown. The data were obtained for an Elekta Synergy at a nominal energy of 6 MV. The profile fit to the measured data was obtained using a three Gaussian fitting algorithm with additional smoothed subtraction fit inside the penumbral region.

Image of FIG. 2.
FIG. 2.

Kernels obtained for a CC04 ionization chamber relative to the Edge detector (a) at 95 cm SSD for an Elekta Synergy and nominal energy 6 MV. The detector point of measurement varied from 0.8 to 25 cm. (b) shows a selection of calculated kernels, averaged over the measurement depth range of 0.8–25 cm, obtained for a CC13 ionization chamber, relative to the Edge detector, at 90 cm SSD. The field size and energy are given. The accelerator make to which the data are associated are listed as Elekta Synergy (E), Varian Trilogy (V), and Siemens Oncor (S).

Image of FIG. 3.
FIG. 3.

The 70%–30% penumbral widths obtained for several detectors on an Elekta Synergy at nominal energy 6 MV. The data collected correspond to a field, 90 cm SSD setup, and depth of measurement ranging from 0.8 to 25 cm. Data are normalized at 15 cm depth for visualization purposes. The solid lines show linear fits to the data.

Image of FIG. 4.
FIG. 4.

(a) Measured CC04 (circle) cross-plane ionization chamber data obtained for an Elekta Synergy at 95 cm SSD and 10 cm depth for a field and 6 MV beam. Corresponding deconvolved CC04 (square) and Edge (line) cross-plane profiles are shown. (b) shows a measured CC13 (circle) ionization chamber cross-plane profile obtained for an Elekta Synergy at 90 cm SSD and 15 cm depth for a field and 6 MV beam. The deconvolved CC13 (square) profile and measured Edge (line) cross-plane profile are shown.

Image of FIG. 5.
FIG. 5.

Calculated convolution kernels obtained for a 6 MV beam on an Elekta Synergy at 90 cm SSD and 10 cm measurement depth. Kernels are shown for the CC13 ionization chamber relative to the Edge detector for both in-plane (dashed) and cross-plane (solid) profile measurements. Kernels are shown for the FC65 ionization chamber relative to the Edge detector for both cross-plane (square) and in-plane (circle) profile measurements

Image of FIG. 6.
FIG. 6.

Measured CC13 ionization chamber cross-plane profile (line-circle) obtained on an Elekta Synergy for a at nominal energy 6 MV, 90 cm SSD, and 10 cm measurement depth. Deconvolution was performed using the averaged kernel parameter (dot) and the averaged kernel parameter (solid) and −10% (dashed).

Tables

Generic image for table
TABLE I.

Convolution kernel shaping parameters for ionization chambers obtained relative to the Edge detector for cross-plane and in-plane measurements. Data were collected on an Elekta Synergy at nominal energy 6 MV and field size . Averaged shaping parameters are from all shaping parameters obtained for all measurement depths in the range 0.8–25 cm and all SSDs in the range 90–110 cm. The maximum and minimum observed shaping parameters are also presented.

Generic image for table
TABLE II.

Convolution kernel shaping parameters obtained for a CC13 ionization chamber obtained relative to the Edge detector at an SSD of 90 cm. Averaged shaping parameters are from all shaping parameters obtained for all measurement depths in the range 0.8–25 cm. Data were collected on an Elekta Synergy at nominal energy 6 MV and field size of .

Generic image for table
TABLE III.

Convolution kernel shaping parameters obtained for a CC13 ionization chamber obtained relative to the Edge detector at 90 cm SSD. Shaping parameters shown are averaged from shaping parameters obtained for all measurement depths in the range 0.8–25 cm. Data are shown for a Varian Trilogy and Siemens Oncor at a nominal energy of 6 MV.

Loading

Article metrics loading...

/content/aapm/journal/medphys/37/2/10.1118/1.3284529
2010-01-07
2014-04-23
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Assessment of the setup dependence of detector response functions for mega-voltage linear accelerators
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/2/10.1118/1.3284529
10.1118/1.3284529
SEARCH_EXPAND_ITEM