It is defined as the ratio of the treated volume to the PTV (planning target volume) [1]. It is a tool for treatment plan analysis in conformal radiotherapy [2].
Bibliographic references:
[1] International Commission on Radiation Units and Measurements. ICRU Report 62. Prescribing, Recording and Reporting Photon Beam Therapy. Supplement to ICRU Report 50. Bethesda, MD: ICRU; 1999.
[2] Kataria T, Sharma K, Subramani V, et al. Homogeneity Index: An objective tool for assessment of conformal radiation treatments. J Med Phys. 2012 Oct;37(4):207-13. Available at https://doi.org/10.4103/0971-6203.103606.
