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RADIATION DOSIMETRY AND CALIBRATION

About : Computation of absorbed dose to water and dose calibration using GUI application.

To run the application open calibration.fig

FILE CONTENTS

  • Calibration.m : Main function.

  • Calibration.fig : Calibration Gui.

  • BeamQual.m : Correction for the user beam quality. Collects and stores data for the beam quality at the corresponding HVL value.

  • BeamQual.fig : Beam quality data Gui

  • DetRespData.m : Collects data for the ionization chamber response (Air-Kerma) with time (sec). Important: Please use the corrected dose values here as the detector response. The End effect correction must be applied only after the correction calculations have been performed.

  • DetRespData.fig : Detector response data Gui.

  • EndEffLinRegr.m : Performs linear regression on the detector response data.

  • Error.m : Generates the error statements throughout the program.

  • Error.fig : Error statement Gui.

  • KqViewGraph.m : Performs extrapolation and interpolation on the beam quality data.

  • KqViewGraph.fig : Shows the piecewice cubic polynomial fit of the beam quality data.

  • LinRegr.m : Performs linear regression to find the ion recombination correction factor.

  • MminusMeasurement.m : Function to collect and store the negative polarity measurements from the ionization chamber.

  • MminusMeasurement.fig : Gui to collect and store the negative polarity measurements from the ionization chamber.

  • MplusMeasurement.m : Function to collect and store the positive polarity measurements from the ionization chamber.

  • MplusMeasurement.fig : Gui to collect and store the positive polarity measurements from the ionization chamber.

  • Pressure.m : Function to collect and store the pressure values at the test location.

  • Pressure.fig : Gui to collect and store the pressure values at the test location.

  • SaveFile.m : Function to save the entered and calculated data from the Calibration Gui.

  • SaveFile.fig : Gui to save the entered and calculated data from the Calibration Gui.

  • Temp.m : Function to collect and store the pressure values at the test location.

  • Temp.fig : Gui to collect and store the pressure values at the test location.

  • ValueSet.m : ValueSet1, ValueSet2, ValueSet3 and ValueSet4 collects the current measurements (M+ and M-) at a selected electrometer voltage.

  • ViewGraph.m : This function executes the LinRegr.m to perform linear regression on the ValueSet data and produces the regression statistics.

  • ViewGraph.fig : Gui to shows the linear regression results of the ValueSet data and displays the regression statistics.

FILE CONTENTS IN SUB-FOLDER ../WaterToAirMeanMassEnergyAbsCoeff/

  • DetectorEfficiency.m : Function to model the quantum efficiency of the photon counting detector.

  • MMEACSaveFile.m : Function to save the entered and calculated data from the water to air mean mass energy absorption coefficient Gui.

  • MMEACSaveFile.fig : Gui to save the entered and calculated data from the water to air mean mass energy absorption coefficient Gui.

  • Note.m : Function to pass helping statements and suggestions.

  • Note.fig : Gui to display helping statements and suggestions.

  • The functions ParseChemicalFormula.m, PhotonAttenuation.m, PhotonAttenuationQ.m and PhysProps.m provide the attenuation and energy absorption of x-ray and gamma-ray photons in various materials including mixtures and compounds, based on NIST report 5632, by J. Hubbell and S.M. Seltzer.

  • TotalEfficiency.m : Function to approximate the total efficiency of the photon counting detector by including the solid angle calculations.

  • WaterToAirMeanMassEnergyAbsCoeff.m : Function to approximate the water to air mean mass energy absorption coefficient form the incident X-Ray spectra.

  • WaterToAirMeanMassEnergyAbsCoeff.fig : Gui to to approximate the water to air mean mass energy absorption coefficient form the incident X-Ray spectra by loading the measured spectrum and getting the user data to approximate the detector properties.

References

  • Andreo, Pedro, et al. "Absorbed dose determination in external beam radiotherapy: an international code of practice for dosimetry based on standards of absorbed dose to water." IAEA TRS 398 (2000).

  • Chica, U., et al. "Quality indexes based on water measurements for low and medium energy x‐ray beams: A theoretical study with PENELOPE." Medical physics 41.1 (2014).

  • Ma, C. M., and J. P. Seuntjens. "Mass-energy absorption coefficient and backscatter factor ratios for kilovoltage x-ray beams." Physics in Medicine & Biology 44.1 (1999): 131.

  • Hill, Robin, et al. "An evaluation of ionization chambers for the relative dosimetry of kilovoltage x‐ray beams." Medical physics 36.9Part1 (2009): 3971-3981.

  • Bruggmoser, G., et al. "Determination of the recombination correction factor kS for some specific plane-parallel and cylindrical ionization chambers in pulsed photon and electron beams." Physics in Medicine & Biology 52.2 (2006): N35.

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Computation of absorbed dose to water and dose calibration.

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