A new evaluation method of target volume coverage and homogeneity for IMRT treatment planning

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Based on the functional approximation of a target volume DVH (TV-DVH) to a modified step function, we propose a new index that indicates the degrees of dose coverage and homogeneity for target volume reached in clinical routines. Forty-seven IMRT patient plans are included in the analysis to explore the efficiency of the proposed method. The new index, named s-index, was defined to vary from 0 to 5 for clinically acceptable TV-DVH at our institution and showed the ability to give the user an idea whether the degree of dose coverage and homogeneity for target volume were adequate when the user-defined criteria had been in place. The result shows that the lower value of s-index indicates the higher dose coverage for the tumor volume and/or the higher dose homogeneity showing the faster fall-off rate at the percentage dose higher than 100 %. In addition to the quantification of dose coverage and homogeneity, it has been also shown that s-index is more accurate in evaluating the dose homogeneity in tumor volume than the conventional method. The proposed method has demonstrated the effectiveness in evaluating TV-DVH in terms of simple index and supplements currently used indices by providing complete information of a DVH curve in a treatment plan.

Original languageEnglish
Pages (from-to)43-51
Number of pages9
JournalPhysica Medica
Volume22
Issue number2
DOIs
Publication statusPublished - 2006
Externally publishedYes

Keywords

  • Coverage index
  • DVH
  • Homogeneity
  • Step function

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Physics and Astronomy(all)

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  • Cite this

    Yoon, M., Shin, D., Park, J., Park, S. Y., Lee, S. B., Kim, J. Y., Kim, T. H., Kim, D. Y., & Cho, K. H. (2006). A new evaluation method of target volume coverage and homogeneity for IMRT treatment planning. Physica Medica, 22(2), 43-51. https://doi.org/10.1016/S1120-1797(06)80052-9