Statistical process control analysis for patient quality assurance of intensity modulated radiation therapy

Rena Lee, Kyubo Kim, Samju Cho, Sangwook Lim, Suk Lee, Jang Bo Shim, Hyun Do Huh, Sang Hoon Lee, Sohyun Ahn

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


This study applied statistical process control to set and verify the quality assurances (QA) tolerance standard for our hospital’s characteristics with the criteria standards that are applied to all the treatment sites with this analysis. Gamma test factor of delivery quality assurances (DQA) was based on 3%/3 mm. Head and neck, breast, prostate cases of intensity modulated radiation therapy (IMRT) or volumetric arc radiation therapy (VMAT) were selected for the analysis of the QA treatment sites. The numbers of data used in the analysis were 73 and 68 for head and neck patients. Prostate and breast were 49 and 152 by MapCHECK and ArcCHECK respectively. Cp value of head and neck and prostate QA were above 1.0, Cpml is 1.53 and 1.71 respectively, which is close to the target value of 100%. Cpml value of breast (IMRT) was 1.67, data values are close to the target value of 95%. But value of was 0.90, which means that the data values are widely distributed. Cp and Cpml of breast VMAT QA were respectively 1.07 and 2.10. This suggests that the VMAT QA has better process capability than the IMRT QA. Consequently, we should pay more attention to planning and QA before treatment for breast Radiotherapy.

Original languageEnglish
Pages (from-to)717-721
Number of pages5
JournalJournal of the Korean Physical Society
Issue number10
StatePublished - 1 Nov 2017

Bibliographical note

Publisher Copyright:
© 2017, The Korean Physical Society.


  • Gamma index
  • Gamma pass rate
  • Process capability index
  • Statistical process control


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