A comparison of four indices for combining distance and dose differences

International Journal of Radiation Oncology, Biology, Physics
Simon J Thomas, Ian R Cowley

Abstract

When one is comparing two dose distributions, a number of methods have been published to combine dose difference and distance to agreement into a single measure. Some have been defined as pass/fail indices and some as numeric indices. We show that the pass/fail indices can all be used to derive numeric indices, and we compare the results of using these indices to evaluate one-dimensional (1D) and three-dimensional (3D) dose distributions, with the aim of selecting the most appropriate index for use in different circumstances. The indices compared are the gamma index, the kappa index, the index in International Commission on Radiation Units & Measurements Report 83, and a box index. Comparisons are made for 1D and 3D distributions. The 1D distribution is chosen to have a variety of dose gradients. The 3D distribution is taken from a clinical treatment plan. The effect of offsetting distributions by known distances and doses is studied. The International Commission on Radiation Units & Measurements Report 83 index causes large discontinuities unless the dose gradient cutoff is set to equal the ratio of the dose tolerance to the distance tolerance. If it is so set, it returns identical results to the kappa index. Where the gradien...Continue Reading

References

Jun 3, 1998·Medical Physics·D A LowJ A Purdy
Oct 8, 2003·Medical Physics·Daniel A Low, James F Dempsey
Feb 10, 2006·Physics in Medicine and Biology·Steve B JiangThomas Bortfeld
Jun 9, 2007·Medical Physics·Markus WendlingMarcel van Herk

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Citations

Jan 6, 2016·The British Journal of Radiology·Simon J ThomasNeil G Burnet
Oct 3, 2015·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Sankar ArumugamLois Holloway
Mar 7, 2013·International Journal of Radiation Oncology, Biology, Physics·Daniel LétourneauDavid A Jaffray
Jul 10, 2019·Journal of Applied Clinical Medical Physics·Liting YuScott B Crowe
Jul 1, 2020·Medical Physics·Mathieu SchopferRaphaël Moeckli
Mar 17, 2017·Journal of Applied Clinical Medical Physics·Mathieu SchopferRaphaël Moeckli

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