A new index of the dose homogeneity for treatment planning

Myonggeun Yoon, Dongho Shin, Sung Yong Park, Se Byeong Lee, Tae Hyun Kim, Dae Yong Kim, Kwan Ho Cho

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The goal of this study is to develop new indices, which effectively evaluate dose homogeneity of intensitymodulated radiotherapy (IMRT) treatment plans with dose– volume histogram (DVH). The newly defined homogeneity indices for assessing dose homogeneity in a target volume, named s-index and n-index, were developed using a normalized differential-DVH (dDVH) and functional approximation of DVH, respectively. Although both indices have been demonstrated to be more accurate than the conventional methods in evaluating the dose homogeneity, the results showed the sindex is more consistent method for quantifying the degree of homogeneity. The s-index, determined as the standard deviation of the normalized dDVH, was found to vary from 0.80 to 3.15 for 16 brain tumor patients at out institution. A guideline of the treatment plan based on s-index for dose homogeneity is discussed with relation to equivalent uniform dose (EUD).

Original languageEnglish
Title of host publicationIFMBE Proceedings
EditorsSun I. Kim, Tae Suk Suh
PublisherSpringer Verlag
Number of pages4
ISBN (Print)9783540368397
Publication statusPublished - 2007
Externally publishedYes
Event10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 - Seoul, Korea, Republic of
Duration: 2006 Aug 272006 Sep 1

Publication series

NameIFMBE Proceedings
ISSN (Print)1680-0737
ISSN (Electronic)1433-9277


Other10th World Congress on Medical Physics and Biomedical Engineering, WC 2006
Country/TerritoryKorea, Republic of


  • Equivalent uniform dose
  • Homogeneity index
  • IMRT
  • Target-volume DVH

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering


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