Measurement of percentage depth dose and lateral beam profile for kilovoltage x-ray therapy beams.
In this work, nine commonly used dosimetry detectors have been investigated to determine suitable relative dosimeters for kilovoltage x-ray beams. By comparison with the Monte Carlo calculated data, it was determined that for the detectors studied the PTW N23342, Markus and NACP parallel-plate chambers are more suitable for the measurement of percentage depth dose (PDD) data for this beam quality range with an uncertainty of about 3%. A diode detector may be used to measure the PDD for the 100 kVp beam, but it is not suitable for higher energies (300 kVp). The Capintec parallel-plate chamber may be adequate for medium-energy photons, but it has a slightly higher uncertainty for low-energy x-rays (100 kVp). For the measurement of beam profiles, diode and film yield incorrect profile tails, which can be corrected using the RK ionization chamber.
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Department of Medical Physics, Ottawa Regional Cancer Centre, Canada. ali@therad.rpslmc.edu
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Salhani
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D006801:Humans; D008962:Models, Theoretical; D009010:Monte Carlo Method; D018482:Muscle, Skeletal; D019047:Phantoms, Imaging; D011878:Radiotherapy / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D015203:Reproducibility of Results; D014867:Water; D014965:X-Rays
D014867:Water