Calculation of backscatter factors for diagnostic radiology using Monte Carlo methods

Phys Med Biol. 1998 Aug;43(8):2237-50. doi: 10.1088/0031-9155/43/8/017.


Backscatter factors were determined for x-ray beams relevant to diagnostic radiology using Monte Carlo methods. The phantom size considered most suitable for calibration of dosimeters is a cuboid of 30 x 30 cm2 front surface and 15 cm depth. This phantom size also provides a good approximation to adult patients. Three different media were studied: water, PMMA and ICRU tissue; the source geometry was a point source with varying field size and source-to-phantom distance. The variations of the backscatter factor with phantom medium and field geometry were examined. From the obtained data, a set of backscatter factors was selected and proposed for adoption as a standard set for the calibration of dosimeters to be used to measure diagnostic reference doses.

MeSH terms

  • Adult
  • Calibration
  • Humans
  • Monte Carlo Method*
  • Phantoms, Imaging*
  • Polymethyl Methacrylate
  • Radiation Dosage
  • Radiographic Image Interpretation, Computer-Assisted*
  • Radiography*
  • Scattering, Radiation
  • Water
  • X-Rays


  • Water
  • Polymethyl Methacrylate