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Kilovoltage energy imaging with a radiotherapy linac with a continuously variable energy range
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10.1118/1.3681011
/content/aapm/journal/medphys/39/3/10.1118/1.3681011
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/3/10.1118/1.3681011

Figures

Image of FIG. 1.
FIG. 1.

Electron energy vs rotavane angle for various input RF power levels. VSWR is voltage standing wave ratio.

Image of FIG. 2.
FIG. 2.

Comparison of depth dose curves for the LowE beam with a kilovoltage imaging system (XVI, Elekta) and a 6 MV therapy beam from an Elekta Precise linac. All curves normalized to 100% at a depth of 5 cm.

Image of FIG. 3.
FIG. 3.

Comparison of photon spectra and detector response. LowZ and 6 MV spectra obtained from a Monte Carlo model from our earlier work.26 SpekCalc is a freely available program for calculating the x-ray emission spectra from tungsten anode x-ray tubes, based on a published model.40

Image of FIG. 4.
FIG. 4.

Planar contrast for various bone thicknesses in 25.8 cm of water for several imaging beams. Error bars not shown on convolution data as they are too small to show.

Image of FIG. 5.
FIG. 5.

Catphan images for the LowE/XVI and 100 kVp/XVI systems. CNR approximately the same in both images. (a) LowE/XVI C16 = 1.81 cGy and (b) 100 kVp/XVI C16 = 0.15 cGy.

Image of FIG. 6.
FIG. 6.

Images of a head phantom for (a) 6 MV/iViewGT (2 cGy); (b) LowE/XVI (0.015 cGy); and (c) 100kVp/XVI (0.00072 cGy). Images have been histogram equalized.

Image of FIG. 7.
FIG. 7.

3D reconstructions of a Rando-Alderson head phantom using a short scan geometry for (a) LowE/XVI (C16 = 0.89 cGy, CTDIcw16 = 0.82 cGy) and (b) 100 kV/XVI normal scan (C16 = 0.15 cGy, CTDIcw16 = 0.17 cGy).

Image of FIG. 8.
FIG. 8.

Planar contrast over a range of beam energies for a 1.6 cm thick bone layer in a 25.8 cm thick Atlantis phantom. Beam line geometry was identical to that used for experimental system with the exception of the electron absorber thickness.

Tables

Generic image for table
TABLE I.

Dose required for the same CNR as a 6 MV/iViewGT system (CNR = 2.77) for a 1.6 cm bone insert in a 25.8 cm Atlantis phantom.

Generic image for table
TABLE II.

Dose to give a CNR of 4.9 for the Delrin insert and 2.3 for the polystyrene insert of the Catphan phantom for different imaging systems.

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/content/aapm/journal/medphys/39/3/10.1118/1.3681011
2012-02-15
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Kilovoltage energy imaging with a radiotherapy linac with a continuously variable energy range
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/3/10.1118/1.3681011
10.1118/1.3681011
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