Electron energy vs rotavane angle for various input RF power levels. VSWR is voltage standing wave ratio.
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.
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
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.
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.
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.
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).
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.
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.
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.
Article metrics loading...
Full text loading...