Measurement of percentage depth dose and lateral beam profile for kilovoltage x-ray therapy beams

X. Allen Li, C. M. Ma, D. Salhani

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)2561-2568
Number of pages8
JournalPhysics in Medicine and Biology
Volume42
Issue number12
DOIs
StatePublished - 1997

Keywords

  • Humans
  • Models, Theoretical
  • Monte Carlo Method
  • Muscle, Skeletal
  • Phantoms, Imaging
  • Radiotherapy Dosage
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy/instrumentation
  • Reproducibility of Results
  • Water
  • X-Rays

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